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Questions and Answers
When balanced, what is the coefficient for PbCO3 in the equation Pb(NO3)2 + K2CO3 → PbCO3 + KNO3?
When balanced, what is the coefficient for PbCO3 in the equation Pb(NO3)2 + K2CO3 → PbCO3 + KNO3?
What is the coefficient of NaI in the balanced equation Na2S2O3 + I2 → NaI + Na2S4O6?
What is the coefficient of NaI in the balanced equation Na2S2O3 + I2 → NaI + Na2S4O6?
What is the correct coefficient for H2O in the balanced equation CH3OH + O2 → CO2 + H2O?
What is the correct coefficient for H2O in the balanced equation CH3OH + O2 → CO2 + H2O?
In the equation NO2 + H2O → HNO3 + NO, what is the coefficient in front of HNO3 when balanced?
In the equation NO2 + H2O → HNO3 + NO, what is the coefficient in front of HNO3 when balanced?
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What is the coefficient for MnCl2 when the reaction MnO2 + HCl → MnCl2 + Cl2 + H2O is balanced?
What is the coefficient for MnCl2 when the reaction MnO2 + HCl → MnCl2 + Cl2 + H2O is balanced?
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Which of the following is not a clue that a chemical reaction has occurred?
Which of the following is not a clue that a chemical reaction has occurred?
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What does the equation $N_2 + 3H_2 → 2NH_3$ imply about the mass of the reacting substances?
What does the equation $N_2 + 3H_2 → 2NH_3$ imply about the mass of the reacting substances?
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How many of the following ways are correct methods to balance the equation $H_2 + O_2 → H_2O$? I. $2H_2 + O_2 → 2H_2O$ II. $H_2 + O_2 → H_2O$ III. $4H_2 + 2O_2 → 4H_2O$ IV. $H_2 + O_2 → H_2O_2$
How many of the following ways are correct methods to balance the equation $H_2 + O_2 → H_2O$? I. $2H_2 + O_2 → 2H_2O$ II. $H_2 + O_2 → H_2O$ III. $4H_2 + 2O_2 → 4H_2O$ IV. $H_2 + O_2 → H_2O_2$
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What is the balanced equation for the reaction of solid aluminum oxide with gaseous carbon monoxide to produce aluminum and carbon dioxide?
What is the balanced equation for the reaction of solid aluminum oxide with gaseous carbon monoxide to produce aluminum and carbon dioxide?
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Which of the following is not a product formed from the reaction of aluminum oxide and carbon monoxide?
Which of the following is not a product formed from the reaction of aluminum oxide and carbon monoxide?
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What is the sum of the coefficients in the balanced equation LiAlH4 + AlCl3 → AlH3 + LiCl?
What is the sum of the coefficients in the balanced equation LiAlH4 + AlCl3 → AlH3 + LiCl?
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Which of the following statements about balancing a chemical equation is true?
Which of the following statements about balancing a chemical equation is true?
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In the equation N2 + O2 → N2O3, what is the correct coefficient required for balancing?
In the equation N2 + O2 → N2O3, what is the correct coefficient required for balancing?
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Is it possible to use fractions as coefficients when balancing a chemical equation?
Is it possible to use fractions as coefficients when balancing a chemical equation?
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What does c/d represent in the equation aA + bB → cC + dD?
What does c/d represent in the equation aA + bB → cC + dD?
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In the reaction KClO3 → KCl + KClO4, what is the coefficient in front of KCl when the equation is balanced using the smallest possible integers?
In the reaction KClO3 → KCl + KClO4, what is the coefficient in front of KCl when the equation is balanced using the smallest possible integers?
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What is the required coefficient for NaOH in the balanced equation NBr3 + NaOH → N2 + NaBr + HOBr?
What is the required coefficient for NaOH in the balanced equation NBr3 + NaOH → N2 + NaBr + HOBr?
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When balancing the equation C6H14 + O2 → CO2 + H2O, what is the coefficient in front of O2?
When balancing the equation C6H14 + O2 → CO2 + H2O, what is the coefficient in front of O2?
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In the equation MgCl2 + K3PO4 → Mg3(PO4)2 + KCl, how many moles of K3PO4 are needed to balance the reaction?
In the equation MgCl2 + K3PO4 → Mg3(PO4)2 + KCl, how many moles of K3PO4 are needed to balance the reaction?
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What is the correct coefficient for H2O when balancing the equation Mg(OH)2(aq) + HBr(aq) → MgBr2(aq) + H2O(l)?
What is the correct coefficient for H2O when balancing the equation Mg(OH)2(aq) + HBr(aq) → MgBr2(aq) + H2O(l)?
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What is the total number of oxygen atoms in the balanced equation 2KClO3(s) → 2KCl(s) + 3O2(g)?
What is the total number of oxygen atoms in the balanced equation 2KClO3(s) → 2KCl(s) + 3O2(g)?
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In the reaction Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(s), how many moles of carbon monoxide are required?
In the reaction Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(s), how many moles of carbon monoxide are required?
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What coefficient should be placed in front of H2O when balancing the equation 2NO(g) + 2H2(g) → N2(g) + ?
What coefficient should be placed in front of H2O when balancing the equation 2NO(g) + 2H2(g) → N2(g) + ?
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What is the balanced coefficient of H2O in the reaction Ca(s) + 2H2O(l) → Ca(OH)2(aq) + ?
What is the balanced coefficient of H2O in the reaction Ca(s) + 2H2O(l) → Ca(OH)2(aq) + ?
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In the balanced reaction 2H2S(g) + 3O2(g) → 2SO2(g) + 2H2O(g), what is the stoichiometric ratio of H2S to SO2?
In the balanced reaction 2H2S(g) + 3O2(g) → 2SO2(g) + 2H2O(g), what is the stoichiometric ratio of H2S to SO2?
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How many moles of CO2 are produced in the reaction Fe2O3(s) + CO(g) → 2FeO(s) + CO2(s)?
How many moles of CO2 are produced in the reaction Fe2O3(s) + CO(g) → 2FeO(s) + CO2(s)?
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Which coefficient is placed before HCl in the balanced equation SiCl4 + H2O → SiO2 + HCl?
Which coefficient is placed before HCl in the balanced equation SiCl4 + H2O → SiO2 + HCl?
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Which of the following represents the balanced form of the equation for the reaction of potassium iodide with chlorine gas?
Which of the following represents the balanced form of the equation for the reaction of potassium iodide with chlorine gas?
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For the reaction of magnesium nitride with water to produce ammonia and magnesium hydroxide, what is the correctly balanced equation?
For the reaction of magnesium nitride with water to produce ammonia and magnesium hydroxide, what is the correctly balanced equation?
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What is the balanced equation for the reaction of calcium with oxygen to form calcium oxide?
What is the balanced equation for the reaction of calcium with oxygen to form calcium oxide?
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In the reaction of sodium with water, which balanced equation correctly represents the products formed?
In the reaction of sodium with water, which balanced equation correctly represents the products formed?
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Which of the following is the correctly balanced chemical equation for the reaction of sugar with oxygen to produce carbon dioxide and water?
Which of the following is the correctly balanced chemical equation for the reaction of sugar with oxygen to produce carbon dioxide and water?
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What is the correct balanced equation for the reaction of magnesium with oxygen?
What is the correct balanced equation for the reaction of magnesium with oxygen?
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When balancing the equation BaCl2(aq) + H2SO4(aq) → BaSO4(s) + HCl(aq), what is the correct coefficient for HCl?
When balancing the equation BaCl2(aq) + H2SO4(aq) → BaSO4(s) + HCl(aq), what is the correct coefficient for HCl?
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In the balanced equation Sb(s) + O2(g) → Sb2O5(s), what is the coefficient for Sb when fully balanced?
In the balanced equation Sb(s) + O2(g) → Sb2O5(s), what is the coefficient for Sb when fully balanced?
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What is the correct coefficient for O2 in the balanced reaction C4H10(g) + O2(g) → CO2(g) + H2O(g)?
What is the correct coefficient for O2 in the balanced reaction C4H10(g) + O2(g) → CO2(g) + H2O(g)?
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In the combustion reaction CH3OH(l) + O2(g) → CO2(g) + H2O(g), how many moles of H2O are produced?
In the combustion reaction CH3OH(l) + O2(g) → CO2(g) + H2O(g), how many moles of H2O are produced?
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What is the coefficient for KNO3 in the balanced equation Pb(NO3)2(aq) + K2CrO4(aq) → PbCrO4(s) + KNO3(aq)?
What is the coefficient for KNO3 in the balanced equation Pb(NO3)2(aq) + K2CrO4(aq) → PbCrO4(s) + KNO3(aq)?
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In the equation (NH4)2Cr2O7(s) → N2(g) + H2O(g) + Cr2O3(s), what is the coefficient of H2O when fully balanced?
In the equation (NH4)2Cr2O7(s) → N2(g) + H2O(g) + Cr2O3(s), what is the coefficient of H2O when fully balanced?
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Which statement about subscripts in a chemical equation is accurate?
Which statement about subscripts in a chemical equation is accurate?
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What is the balanced form of the reaction for calcium metal with oxygen gas producing calcium oxide?
What is the balanced form of the reaction for calcium metal with oxygen gas producing calcium oxide?
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In the balanced equation for the reaction of potassium metal with water, what does the final product consist of?
In the balanced equation for the reaction of potassium metal with water, what does the final product consist of?
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What is the coefficient in front of NaOH when balancing the equation 2Na + 2H2O → 2NaOH + H2?
What is the coefficient in front of NaOH when balancing the equation 2Na + 2H2O → 2NaOH + H2?
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What is the coefficient for K2CO3 in the balanced equation Pb(NO3)2 + K2CO3 → PbCO3 + KNO3?
What is the coefficient for K2CO3 in the balanced equation Pb(NO3)2 + K2CO3 → PbCO3 + KNO3?
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In balancing the equation Al + Fe3O4 → Al2O3 + Fe, what is the coefficient of Al?
In balancing the equation Al + Fe3O4 → Al2O3 + Fe, what is the coefficient of Al?
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What will be the coefficient for H2O in the balanced equation CH3OH + O2 → CO2 + H2O?
What will be the coefficient for H2O in the balanced equation CH3OH + O2 → CO2 + H2O?
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When balancing the equation P4O10 + H2O → H3PO4, what is the coefficient for H3PO4?
When balancing the equation P4O10 + H2O → H3PO4, what is the coefficient for H3PO4?
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What is the sum of the coefficients when balancing the equation LiAlH4(s) + AlCl3(s) → AlH3(s) + LiCl(s)?
What is the sum of the coefficients when balancing the equation LiAlH4(s) + AlCl3(s) → AlH3(s) + LiCl(s)?
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In the equation aA + bB → cC + dD, how many distinct values can be assigned to c/d?
In the equation aA + bB → cC + dD, how many distinct values can be assigned to c/d?
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Which statement is accurate regarding the use of coefficients when balancing a chemical equation?
Which statement is accurate regarding the use of coefficients when balancing a chemical equation?
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When the equation Pb(s) + AgNO3(aq) → Pb(NO3)2 + Ag(s) is balanced, what will be the coefficient of Ag?
When the equation Pb(s) + AgNO3(aq) → Pb(NO3)2 + Ag(s) is balanced, what will be the coefficient of Ag?
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What misconception about balancing chemical equations is highlighted by the statement 'The subscripts in the reactants must be maintained in the products'?
What misconception about balancing chemical equations is highlighted by the statement 'The subscripts in the reactants must be maintained in the products'?
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What does the equation $N_2 + 3H_2 → 2NH_3$ indicate about the relationship between the masses of the reacting substances?
What does the equation $N_2 + 3H_2 → 2NH_3$ indicate about the relationship between the masses of the reacting substances?
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How many correct methods are there to balance the equation $H_2 + O_2 → H_2O$?
How many correct methods are there to balance the equation $H_2 + O_2 → H_2O$?
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Which of the following is the balanced equation for the reaction of solid aluminum oxide with carbon monoxide?
Which of the following is the balanced equation for the reaction of solid aluminum oxide with carbon monoxide?
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Which of the following equations represents a situation where mass is not conserved?
Which of the following equations represents a situation where mass is not conserved?
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What is the correct coefficient for $O_2$ when balancing the reaction $C_6H_{14} + O_2 → CO_2 + H_2O$?
What is the correct coefficient for $O_2$ when balancing the reaction $C_6H_{14} + O_2 → CO_2 + H_2O$?
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When balancing the equation $NaBH_4 + BF_3 → NaBF_4 + B_2H_6$, how many moles of $NaBH_4$ are needed?
When balancing the equation $NaBH_4 + BF_3 → NaBF_4 + B_2H_6$, how many moles of $NaBH_4$ are needed?
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What is the coefficient for $K_3PO_4$ when balancing the equation $MgCl_2 + K_3PO_4 → Mg_3(PO_4)_2 + KCl$?
What is the coefficient for $K_3PO_4$ when balancing the equation $MgCl_2 + K_3PO_4 → Mg_3(PO_4)_2 + KCl$?
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In the balanced equation for $As_2O_3 + Ca(OH)_2 → Ca_3(AsO_4)_2 + H_2O$, how many moles of $Ca(OH)_2$ are there?
In the balanced equation for $As_2O_3 + Ca(OH)_2 → Ca_3(AsO_4)_2 + H_2O$, how many moles of $Ca(OH)_2$ are there?
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When balancing the equation $Sb(s) + O_2(g) → Sb_2O_3(s)$, what is the coefficient in front of $Sb$?
When balancing the equation $Sb(s) + O_2(g) → Sb_2O_3(s)$, what is the coefficient in front of $Sb$?
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What is the correct coefficient for O2 when balancing the equation $KClO3(s) \rightarrow KCl(s) + O2(g)$?
What is the correct coefficient for O2 when balancing the equation $KClO3(s) \rightarrow KCl(s) + O2(g)$?
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When the equation $2NO(g) + 2H2(g) \rightarrow N2(g) + ?$ is balanced, what is the coefficient in front of H2O?
When the equation $2NO(g) + 2H2(g) \rightarrow N2(g) + ?$ is balanced, what is the coefficient in front of H2O?
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What is the required coefficient for HCl when balancing the equation $SiCl4 + H2O \rightarrow SiO2 + HCl$?
What is the required coefficient for HCl when balancing the equation $SiCl4 + H2O \rightarrow SiO2 + HCl$?
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In the balanced reaction $Fe2O3(s) + ?CO(g) \rightarrow 2FeO(s) + CO2(s)$, what is the coefficient in front of CO?
In the balanced reaction $Fe2O3(s) + ?CO(g) \rightarrow 2FeO(s) + CO2(s)$, what is the coefficient in front of CO?
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What is the coefficient in front of H2O in the balanced equation $Ca(s) + 2H2O(l) \rightarrow Ca(OH)2(aq) + ?$?
What is the coefficient in front of H2O in the balanced equation $Ca(s) + 2H2O(l) \rightarrow Ca(OH)2(aq) + ?$?
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When balancing the equation $2H2S(g) + 3O2(g) \rightarrow ?SO2(g) + 2H2O(g)$, what is the coefficient in front of SO2?
When balancing the equation $2H2S(g) + 3O2(g) \rightarrow ?SO2(g) + 2H2O(g)$, what is the coefficient in front of SO2?
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To balance the equation $Cu(s) + 2H2SO4(aq) \rightarrow ?CuSO4(aq) + SO2(g) + ?H2O(l)$, what is the coefficient for CuSO4?
To balance the equation $Cu(s) + 2H2SO4(aq) \rightarrow ?CuSO4(aq) + SO2(g) + ?H2O(l)$, what is the coefficient for CuSO4?
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What is the balanced equation for the reaction of magnesium nitride with water to produce ammonia and magnesium hydroxide?
What is the balanced equation for the reaction of magnesium nitride with water to produce ammonia and magnesium hydroxide?
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Which of the following correctly balances the equation for the reaction of sodium with water?
Which of the following correctly balances the equation for the reaction of sodium with water?
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What is the correct balanced equation for the reaction of calcium carbonate with hydrochloric acid?
What is the correct balanced equation for the reaction of calcium carbonate with hydrochloric acid?
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In the balanced equation for the reaction of phosphorus tribromide with water, what are the correct coefficients?
In the balanced equation for the reaction of phosphorus tribromide with water, what are the correct coefficients?
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What is the balanced equation for the reaction of iron(II) nitrate with hydrogen sulfide?
What is the balanced equation for the reaction of iron(II) nitrate with hydrogen sulfide?
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What is the coefficient of Sb in the balanced equation Sb(s) + O2(g) → Sb2O5(s)?
What is the coefficient of Sb in the balanced equation Sb(s) + O2(g) → Sb2O5(s)?
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Which coefficient is correct for O2 in the balanced reaction of C4H10(g) + O2(g) → CO2(g) + H2O(g)?
Which coefficient is correct for O2 in the balanced reaction of C4H10(g) + O2(g) → CO2(g) + H2O(g)?
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In the balanced equation CH3OH(l) + O2(g) → CO2(g) + H2O(g), what is the coefficient of H2O?
In the balanced equation CH3OH(l) + O2(g) → CO2(g) + H2O(g), what is the coefficient of H2O?
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What coefficient for KNO3 is required to balance the equation Pb(NO3)2(aq) + K2CrO4(aq) → PbCrO4(s) + KNO3(aq)?
What coefficient for KNO3 is required to balance the equation Pb(NO3)2(aq) + K2CrO4(aq) → PbCrO4(s) + KNO3(aq)?
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When balancing the equation (NH4)2Cr2O7(s) → N2(g) + H2O(g) + Cr2O3(s), what is the coefficient for H2O?
When balancing the equation (NH4)2Cr2O7(s) → N2(g) + H2O(g) + Cr2O3(s), what is the coefficient for H2O?
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What is the coefficient of HCl in the balanced equation BaCl2(aq) + H2SO4(aq) → BaSO4(s) + HCl(aq)?
What is the coefficient of HCl in the balanced equation BaCl2(aq) + H2SO4(aq) → BaSO4(s) + HCl(aq)?
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In the reaction of calcium metal and oxygen gas to produce calcium oxide, what is the final balanced equation?
In the reaction of calcium metal and oxygen gas to produce calcium oxide, what is the final balanced equation?
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What is the coefficient for Al in the balanced equation 2Al(s) + 3I2(s) → 2AlI3(s)?
What is the coefficient for Al in the balanced equation 2Al(s) + 3I2(s) → 2AlI3(s)?
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Which statement about balancing a chemical equation is incorrect?
Which statement about balancing a chemical equation is incorrect?
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In the balanced equation for the reaction of potassium metal with water, what is the final product formed?
In the balanced equation for the reaction of potassium metal with water, what is the final product formed?
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What is the coefficient for O2 when balancing the equation C6H14 + O2 → CO2 + H2O?
What is the coefficient for O2 when balancing the equation C6H14 + O2 → CO2 + H2O?
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When balancing the equation KClO3 → KCl + KClO4, what is the coefficient for KCl when written in smallest integers?
When balancing the equation KClO3 → KCl + KClO4, what is the coefficient for KCl when written in smallest integers?
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What is the correct coefficient for NaOH in balancing the equation NBr3 + NaOH → N2 + NaBr + HOBr?
What is the correct coefficient for NaOH in balancing the equation NBr3 + NaOH → N2 + NaBr + HOBr?
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In the balanced equation MgCl2 + K3PO4 → Mg3(PO4)2 + KCl, how many moles of K3PO4 are necessary?
In the balanced equation MgCl2 + K3PO4 → Mg3(PO4)2 + KCl, how many moles of K3PO4 are necessary?
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What is the coefficient of H2O in the balanced equation Mg(OH)2 + 2HBr → MgBr2 + 2H2O?
What is the coefficient of H2O in the balanced equation Mg(OH)2 + 2HBr → MgBr2 + 2H2O?
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What is the correct coefficient when balancing the equation Pb(s) + AgNO3(aq) → Pb(NO3)2 + Ag(s)?
What is the correct coefficient when balancing the equation Pb(s) + AgNO3(aq) → Pb(NO3)2 + Ag(s)?
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What coefficient should be placed in front of O2 when balancing the equation S(s) + O2(g) → SO2(g)?
What coefficient should be placed in front of O2 when balancing the equation S(s) + O2(g) → SO2(g)?
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When balancing the reaction N2(g) + O2(g) → N2O3, what is the correct coefficient for N2 when fully balanced?
When balancing the reaction N2(g) + O2(g) → N2O3, what is the correct coefficient for N2 when fully balanced?
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What is the sum of the coefficients in the balanced form of the equation Al2O3(s) + H2SO4(aq) → Al2(SO4)3(aq) + H2O(l)?
What is the sum of the coefficients in the balanced form of the equation Al2O3(s) + H2SO4(aq) → Al2(SO4)3(aq) + H2O(l)?
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In the equation 2H2 + O2 → 2H2O, how many molecules of H2O are formed when fully balanced?
In the equation 2H2 + O2 → 2H2O, how many molecules of H2O are formed when fully balanced?
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Which of the following observations is NOT a clue that a chemical reaction has occurred?
Which of the following observations is NOT a clue that a chemical reaction has occurred?
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What does the equation $N_2 + 3H_2 → 2NH_3$ imply about the relative masses of the reacting substances?
What does the equation $N_2 + 3H_2 → 2NH_3$ imply about the relative masses of the reacting substances?
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How many correct methods to balance the equation $H_2 + O_2 → H_2O$ are identified in the given options?
How many correct methods to balance the equation $H_2 + O_2 → H_2O$ are identified in the given options?
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What is the balanced equation for the reaction of solid aluminum oxide with gaseous carbon monoxide?
What is the balanced equation for the reaction of solid aluminum oxide with gaseous carbon monoxide?
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Which of the following is true regarding the chemical reaction products of aluminum oxide and carbon monoxide?
Which of the following is true regarding the chemical reaction products of aluminum oxide and carbon monoxide?
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When balancing the equation $Na2S2O3 + I2 → NaI + Na2S4O6$, what is the correct coefficient in front of NaI?
When balancing the equation $Na2S2O3 + I2 → NaI + Na2S4O6$, what is the correct coefficient in front of NaI?
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In the balanced equation $Pb(NO3)2 + K2CO3 → PbCO3 + KNO3$, what coefficient corresponds to KNO3?
In the balanced equation $Pb(NO3)2 + K2CO3 → PbCO3 + KNO3$, what coefficient corresponds to KNO3?
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What is the coefficient for Al when balancing the equation $Al + Fe3O4 → Al2O3 + Fe$?
What is the coefficient for Al when balancing the equation $Al + Fe3O4 → Al2O3 + Fe$?
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What is the coefficient in front of H2O for the balanced equation $CH3OH + O2 → CO2 + H2O$?
What is the coefficient in front of H2O for the balanced equation $CH3OH + O2 → CO2 + H2O$?
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In the reaction $MnO2 + HCl → MnCl2 + Cl2 + H2O$, which coefficient should be placed in front of HCl when balanced?
In the reaction $MnO2 + HCl → MnCl2 + Cl2 + H2O$, which coefficient should be placed in front of HCl when balanced?
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What is the correct balanced equation for the reaction of potassium iodide with chlorine gas?
What is the correct balanced equation for the reaction of potassium iodide with chlorine gas?
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Which of the following represents the correct coefficients for the balanced equation of magnesium nitride reacting with water to produce ammonia and magnesium hydroxide?
Which of the following represents the correct coefficients for the balanced equation of magnesium nitride reacting with water to produce ammonia and magnesium hydroxide?
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In the balanced equation for the reaction of calcium with oxygen to form calcium oxide, what are the correct coefficients?
In the balanced equation for the reaction of calcium with oxygen to form calcium oxide, what are the correct coefficients?
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What is the balanced form of the equation for the reaction of sodium with water?
What is the balanced form of the equation for the reaction of sodium with water?
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In the combustion reaction $C3H7OH + O2 → CO2 + H2O$, what are the correct coefficients for the balanced equation?
In the combustion reaction $C3H7OH + O2 → CO2 + H2O$, what are the correct coefficients for the balanced equation?
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What is the coefficient in front of SiO2 when balancing the equation SiCl4 + H2O → SiO2 + HCl?
What is the coefficient in front of SiO2 when balancing the equation SiCl4 + H2O → SiO2 + HCl?
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In the reaction H2O2(l) → H2O(l) + O2(g), what is the coefficient of H2O when balanced?
In the reaction H2O2(l) → H2O(l) + O2(g), what is the coefficient of H2O when balanced?
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What is the number in front of O2 when balancing the equation KClO3(s) → KCl(s) + O2(g)?
What is the number in front of O2 when balancing the equation KClO3(s) → KCl(s) + O2(g)?
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When balancing the equation Cu(s) + H2SO4(aq) → CuSO4(aq) + SO2(g) + H2O(l), what is the coefficient in front of H2O?
When balancing the equation Cu(s) + H2SO4(aq) → CuSO4(aq) + SO2(g) + H2O(l), what is the coefficient in front of H2O?
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When balancing the equation Fe2O3(s) + 3CO(g) → 2FeO(s) + CO2(s), what is the correct coefficient for CO2?
When balancing the equation Fe2O3(s) + 3CO(g) → 2FeO(s) + CO2(s), what is the correct coefficient for CO2?
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What is the correct coefficient for H2 in the balanced equation 2H2 + O2 → 2H2O?
What is the correct coefficient for H2 in the balanced equation 2H2 + O2 → 2H2O?
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What is the correct coefficient for HCl when balancing the equation BaCl2(aq) + H2SO4(aq) → BaSO4(s) + HCl(aq)?
What is the correct coefficient for HCl when balancing the equation BaCl2(aq) + H2SO4(aq) → BaSO4(s) + HCl(aq)?
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Which coefficient is needed for O2 in the balanced equation C4H10(g) + O2(g) → CO2(g) + H2O(g)?
Which coefficient is needed for O2 in the balanced equation C4H10(g) + O2(g) → CO2(g) + H2O(g)?
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Which of the following represents the correct coefficient for H2O when balancing the equation (NH4)2Cr2O7(s) → N2(g) + H2O(g) + Cr2O3(s)?
Which of the following represents the correct coefficient for H2O when balancing the equation (NH4)2Cr2O7(s) → N2(g) + H2O(g) + Cr2O3(s)?
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What is the correct coefficient for KNO3 in the balanced equation Pb(NO3)2(aq) + K2CrO4(aq) → PbCrO4(s) + KNO3(aq)?
What is the correct coefficient for KNO3 in the balanced equation Pb(NO3)2(aq) + K2CrO4(aq) → PbCrO4(s) + KNO3(aq)?
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In the equation CH3OH(l) + O2(g) → CO2(g) + H2O(g), what is the coefficient for CO2 when fully balanced?
In the equation CH3OH(l) + O2(g) → CO2(g) + H2O(g), what is the coefficient for CO2 when fully balanced?
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What is the coefficient for H2O in the balanced equation 2C4H10(g) + O2(g) → CO2(g) + H2O(g)?
What is the coefficient for H2O in the balanced equation 2C4H10(g) + O2(g) → CO2(g) + H2O(g)?
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In the reaction (NH4)2Cr2O7(s) → N2(g) + H2O(g) + Cr2O3(s), what is the coefficient of N2 when fully balanced?
In the reaction (NH4)2Cr2O7(s) → N2(g) + H2O(g) + Cr2O3(s), what is the coefficient of N2 when fully balanced?
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Which coefficient would be correct for the reaction of potassium metal with water to form potassium hydroxide and hydrogen gas?
Which coefficient would be correct for the reaction of potassium metal with water to form potassium hydroxide and hydrogen gas?
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What is the coefficient of oxygen gas (O2) in the balanced equation for the combustion of methanol CH3OH?
What is the coefficient of oxygen gas (O2) in the balanced equation for the combustion of methanol CH3OH?
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What is the sum of the coefficients when balancing the equation Pb(s) + AgNO3(aq) → Pb(NO3)2 + Ag(s)?
What is the sum of the coefficients when balancing the equation Pb(s) + AgNO3(aq) → Pb(NO3)2 + Ag(s)?
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In the reaction N2(g) + O2(g) → N2O3, how many total moles of gas are reacting on the left side of the equation?
In the reaction N2(g) + O2(g) → N2O3, how many total moles of gas are reacting on the left side of the equation?
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When balancing the equation Al2O3(s) + H2SO4(aq) → Al2(SO4)3(aq) + H2O(l), what coefficient should be placed in front of H2SO4?
When balancing the equation Al2O3(s) + H2SO4(aq) → Al2(SO4)3(aq) + H2O(l), what coefficient should be placed in front of H2SO4?
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In the equation S(s) + O2(g) → SO2(g), what is the required coefficient for O2 when balanced?
In the equation S(s) + O2(g) → SO2(g), what is the required coefficient for O2 when balanced?
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Which of the following statements describes a requirement when balancing the reaction aA + bB → cC + dD?
Which of the following statements describes a requirement when balancing the reaction aA + bB → cC + dD?
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Which of the following statements correctly identifies a sign of a chemical reaction occurring?
Which of the following statements correctly identifies a sign of a chemical reaction occurring?
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What implication does the equation $N_2 + 3H_2 → 2NH_3$ have regarding the mass of the substances involved?
What implication does the equation $N_2 + 3H_2 → 2NH_3$ have regarding the mass of the substances involved?
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How many of the following ways are valid methods to balance the equation $H_2 + O_2 → H_2O$? I. $2H_2 + O_2 → 2H_2O$ II. $H_2 + O_2 → H_2O$ III. $4H_2 + 2O_2 → 4H_2O$ IV. $H_2 + O_2 → H_2O_2$
How many of the following ways are valid methods to balance the equation $H_2 + O_2 → H_2O$? I. $2H_2 + O_2 → 2H_2O$ II. $H_2 + O_2 → H_2O$ III. $4H_2 + 2O_2 → 4H_2O$ IV. $H_2 + O_2 → H_2O_2$
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What is the balanced equation for the reaction of aluminum oxide with carbon monoxide to produce aluminum and carbon dioxide?
What is the balanced equation for the reaction of aluminum oxide with carbon monoxide to produce aluminum and carbon dioxide?
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In the equation $N_2 + 3H_2 → 2NH_3$, which of the following statements regarding the reactants is false?
In the equation $N_2 + 3H_2 → 2NH_3$, which of the following statements regarding the reactants is false?
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What is the coefficient for NaOH when balancing the equation 2Na + 2H2O → 2NaOH + H2?
What is the coefficient for NaOH when balancing the equation 2Na + 2H2O → 2NaOH + H2?
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In the balanced reaction MnO2 + HCl → MnCl2 + Cl2 + H2O, what is the coefficient in front of Cl2?
In the balanced reaction MnO2 + HCl → MnCl2 + Cl2 + H2O, what is the coefficient in front of Cl2?
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What will be the coefficient for NaI when balancing the equation Na2S2O3 + I2 → NaI + Na2S4O6?
What will be the coefficient for NaI when balancing the equation Na2S2O3 + I2 → NaI + Na2S4O6?
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What is the coefficient in front of CO2 when the equation C2H6 + O2 → CO2 + H2O is balanced using the smallest possible integers?
What is the coefficient in front of CO2 when the equation C2H6 + O2 → CO2 + H2O is balanced using the smallest possible integers?
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What coefficient is required in front of HCl when balancing the equation SiCl4 + H2O → SiO2 + HCl?
What coefficient is required in front of HCl when balancing the equation SiCl4 + H2O → SiO2 + HCl?
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In the balanced equation KClO3(s) → KCl(s) + O2(g), what is the coefficient in front of KClO3?
In the balanced equation KClO3(s) → KCl(s) + O2(g), what is the coefficient in front of KClO3?
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What is the coefficient for H2O in the balanced equation Ca(s) + H2O(l) → Ca(OH)2(aq) + H2(g)?
What is the coefficient for H2O in the balanced equation Ca(s) + H2O(l) → Ca(OH)2(aq) + H2(g)?
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When balancing the equation 2H2S(g) + O2(g) → SO2(g) + H2O(g), how many moles of O2 are required?
When balancing the equation 2H2S(g) + O2(g) → SO2(g) + H2O(g), how many moles of O2 are required?
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What coefficient should be placed in front of CO in the equation Fe2O3(s) + CO(g) → FeO(s) + CO2(s) when balanced?
What coefficient should be placed in front of CO in the equation Fe2O3(s) + CO(g) → FeO(s) + CO2(s) when balanced?
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In the balanced equation for the reaction of copper (Cu) with sulfuric acid (H2SO4), what is the coefficient for H2O?
In the balanced equation for the reaction of copper (Cu) with sulfuric acid (H2SO4), what is the coefficient for H2O?
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When the equation NaBH4 + BF3 → NaBF4 + B2H6 is balanced, what is the coefficient in front of NaBH4?
When the equation NaBH4 + BF3 → NaBF4 + B2H6 is balanced, what is the coefficient in front of NaBH4?
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What is the coefficient for K3PO4 in the balanced equation MgCl2 + K3PO4 → Mg3(PO4)2 + KCl?
What is the coefficient for K3PO4 in the balanced equation MgCl2 + K3PO4 → Mg3(PO4)2 + KCl?
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In the balanced equation As2O3 + Ca(OH)2 → Ca3(AsO4)2 + H2O, what is the coefficient in front of Ca(OH)2?
In the balanced equation As2O3 + Ca(OH)2 → Ca3(AsO4)2 + H2O, what is the coefficient in front of Ca(OH)2?
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What is the coefficient of BF3 in the balanced equation 3NaBH4 + 4BF3 → 3NaBF4 + 2B2H6?
What is the coefficient of BF3 in the balanced equation 3NaBH4 + 4BF3 → 3NaBF4 + 2B2H6?
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What is the correct coefficient of HCl in the balanced equation BaCl2(aq) + H2SO4(aq) → BaSO4(s) + ?
What is the correct coefficient of HCl in the balanced equation BaCl2(aq) + H2SO4(aq) → BaSO4(s) + ?
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What is the coefficient in front of O2 in the balanced reaction C4H10(g) + O2(g) → CO2(g) + H2O(g)?
What is the coefficient in front of O2 in the balanced reaction C4H10(g) + O2(g) → CO2(g) + H2O(g)?
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What is the coefficient of H2O when balancing the equation CH3OH(l) + O2(g) → CO2(g) + H2O(g)?
What is the coefficient of H2O when balancing the equation CH3OH(l) + O2(g) → CO2(g) + H2O(g)?
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In the equation (NH4)2Cr2O7(s) → N2(g) + ? + Cr2O3(s), what is the coefficient of H2O when fully balanced?
In the equation (NH4)2Cr2O7(s) → N2(g) + ? + Cr2O3(s), what is the coefficient of H2O when fully balanced?
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When balancing the equation 2Ca(s) + O2(g) → ?CaO(s), what is the coefficient of CaO?
When balancing the equation 2Ca(s) + O2(g) → ?CaO(s), what is the coefficient of CaO?
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In the reaction BaCl2(aq) + H2SO4(aq) → BaSO4(s) + ?, what is the correct coefficient for BaSO4?
In the reaction BaCl2(aq) + H2SO4(aq) → BaSO4(s) + ?, what is the correct coefficient for BaSO4?
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What is the coefficient for KNO3 when balancing Pb(NO3)2(aq) + K2CrO4(aq) → PbCrO4(s) + ?
What is the coefficient for KNO3 when balancing Pb(NO3)2(aq) + K2CrO4(aq) → PbCrO4(s) + ?
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What is the correct coefficient of I2 when balancing the equation 2Al(s) + 3I2(s) → ?AlI3(s)?
What is the correct coefficient of I2 when balancing the equation 2Al(s) + 3I2(s) → ?AlI3(s)?
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What is the coefficient of H2O in the balanced equation for the reaction CH4 + O2 → CO2 + H2O?
What is the coefficient of H2O in the balanced equation for the reaction CH4 + O2 → CO2 + H2O?
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What is the correct balanced equation for the reaction of sodium with water?
What is the correct balanced equation for the reaction of sodium with water?
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When balancing the equation CaCO3(s) + HCl(aq) → H2O(l) + CO2(g) + CaCl2(aq), which of the following is true?
When balancing the equation CaCO3(s) + HCl(aq) → H2O(l) + CO2(g) + CaCl2(aq), which of the following is true?
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What is the balanced coefficient for water in the combustion reaction of ethanol C2H5OH(l) + O2(g) → CO2(g) + H2O(g)?
What is the balanced coefficient for water in the combustion reaction of ethanol C2H5OH(l) + O2(g) → CO2(g) + H2O(g)?
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For the balanced equation Mg3N2(s) + H2O(l) → NH3(g) + Mg(OH)2(s), how many water molecules are required?
For the balanced equation Mg3N2(s) + H2O(l) → NH3(g) + Mg(OH)2(s), how many water molecules are required?
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Which equation correctly represents the balanced reaction between zinc and hydrochloric acid?
Which equation correctly represents the balanced reaction between zinc and hydrochloric acid?
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Study Notes
Chemistry Definitions
- Science: A framework for acquiring and organizing knowledge; a process for understanding information.
- Chemistry: The science of matter and its transformations.
Scientific Method
- Scientific Method: The core of scientific inquiry.
- Natural Law: A statement describing observed behavior (often mathematical).
- Hypothesis: A suggested explanation for an observation.
- Theory: A set of tested hypotheses explaining a natural phenomenon.
Steps of the Scientific Method
- Make an observation.
- Formulate a hypothesis.
- Perform an experiment.
- Develop a theory (or model). (Note: Changing results to match a hypothesis is incorrect)
Laws and Theories
- Law: A summary of observed behavior; a statement about the world.
- Theory: An explanation of the behavior.
Quantitative vs. Qualitative Observations
- Quantitative Observation (Measurement): Includes a number and a unit.
- Qualitative Observation: Describes qualities without numbers.
Examples
- Quantitative: "The temperature is 60°C."
- Qualitative: "The leaf is short."
Key Concepts
- In a balanced chemical equation, the number of atoms of each element is the same on both sides of the equation.
- Coefficients are used to balance the number of atoms.
- Subscripts within a chemical formula are not changed during balancing.
- Phases (solid, liquid, gas, aqueous) are often shown but are not critical for balancing an equation.
- Coefficients may include fractional numbers, but simplified integer values are preferred when possible.
Studying That Suits You
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Description
Test your understanding of essential chemistry definitions and the scientific method. This quiz covers key terms and steps involved in scientific inquiry, including observations, hypotheses, laws, and theories. Make sure to grasp the differences between quantitative and qualitative observations as well.
