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Questions and Answers
Given the unbalanced equation $Fe + O_2 \rightarrow Fe_2O_3$, what is the coefficient for $Fe$ when the equation is balanced?
Given the unbalanced equation $Fe + O_2 \rightarrow Fe_2O_3$, what is the coefficient for $Fe$ when the equation is balanced?
- 1
- 3
- 4 (correct)
- 2
Consider the reaction: $S_2Cl_2(l) + NH_3(l) \rightarrow S_4N_4(s) + S_8(s) + NH_4Cl(s)$. What is the smallest whole number coefficient of $NH_3$ when the equation is properly balanced?
Consider the reaction: $S_2Cl_2(l) + NH_3(l) \rightarrow S_4N_4(s) + S_8(s) + NH_4Cl(s)$. What is the smallest whole number coefficient of $NH_3$ when the equation is properly balanced?
- 8
- 2
- 4
- 6 (correct)
When the equation $C_3H_5N_3O_9(l) \rightarrow CO_2(g) + N_2(g) + H_2O(g) + O_2(g)$ is properly balanced, what is the coefficient for $CO_2$?
When the equation $C_3H_5N_3O_9(l) \rightarrow CO_2(g) + N_2(g) + H_2O(g) + O_2(g)$ is properly balanced, what is the coefficient for $CO_2$?
- 9
- 3
- 6
- 12 (correct)
Consider the unbalanced chemical equation: $CH_3NH_2(g) + O_2(g) \rightarrow H_2O(g) + CO_2(g) + N_2(g)$. What is the coefficient of oxygen gas ($O_2$) when the equation is balanced using the smallest whole number coefficients?
Consider the unbalanced chemical equation: $CH_3NH_2(g) + O_2(g) \rightarrow H_2O(g) + CO_2(g) + N_2(g)$. What is the coefficient of oxygen gas ($O_2$) when the equation is balanced using the smallest whole number coefficients?
What is the coefficient for water when the following equation is balanced with the smallest whole number coefficients? $Ca_5(PO_4)_3F(s) + H_2SO_4(aq) + H_2O(l) \rightarrow H_3PO_4(aq) + CaSO_4 \cdot 2H_2O(s) + HF(aq)$
What is the coefficient for water when the following equation is balanced with the smallest whole number coefficients? $Ca_5(PO_4)_3F(s) + H_2SO_4(aq) + H_2O(l) \rightarrow H_3PO_4(aq) + CaSO_4 \cdot 2H_2O(s) + HF(aq)$
Given the unbalanced reaction $IO_2F(s) + BrF_3(l) \rightarrow IF_5(l) + Br_2(l) + O_2(g)$, what is the coefficient of $Br_2(l)$ when the equation is properly balanced using the smallest whole numbers?
Given the unbalanced reaction $IO_2F(s) + BrF_3(l) \rightarrow IF_5(l) + Br_2(l) + O_2(g)$, what is the coefficient of $Br_2(l)$ when the equation is properly balanced using the smallest whole numbers?
Consider the unbalanced chemical reaction: $K(s) + H_2O(l) \rightarrow KOH(aq) + H_2(g)$. If 10.0 grams of potassium completely react, what volume of hydrogen gas is produced at standard temperature and pressure (STP)? (Molar mass of K = 39.10 g/mol, Molar volume of gas at STP = 22.4 L/mol)
Consider the unbalanced chemical reaction: $K(s) + H_2O(l) \rightarrow KOH(aq) + H_2(g)$. If 10.0 grams of potassium completely react, what volume of hydrogen gas is produced at standard temperature and pressure (STP)? (Molar mass of K = 39.10 g/mol, Molar volume of gas at STP = 22.4 L/mol)
What type of chemical reaction is represented by the following equation? $CuCl_2(aq) + 2AgNO_3(aq) \rightarrow Cu(NO_3)_2(aq) + 2AgCl(s)$
What type of chemical reaction is represented by the following equation? $CuCl_2(aq) + 2AgNO_3(aq) \rightarrow Cu(NO_3)_2(aq) + 2AgCl(s)$
Given the single-replacement reaction: $2NaCl(aq) + F_2(g) \rightarrow 2NaF(s) + Cl_2(g)$, which statement accurately describes the activity of the halogens?
Given the single-replacement reaction: $2NaCl(aq) + F_2(g) \rightarrow 2NaF(s) + Cl_2(g)$, which statement accurately describes the activity of the halogens?
Which of the following single-replacement reactions will occur, based on the activity series principle?
Which of the following single-replacement reactions will occur, based on the activity series principle?
If sodium metal reacts with water, what are the products of the reaction?
If sodium metal reacts with water, what are the products of the reaction?
Consider the unbalanced equation for the combustion of ethane: $C_2H_6 + O_2 \rightarrow CO_2 + H_2O$. After balancing, if 1 mole of ethane is completely combusted, how many moles of water are produced?
Consider the unbalanced equation for the combustion of ethane: $C_2H_6 + O_2 \rightarrow CO_2 + H_2O$. After balancing, if 1 mole of ethane is completely combusted, how many moles of water are produced?
In the reaction where aluminium reacts with bromine, what is the correct balanced chemical equation?
In the reaction where aluminium reacts with bromine, what is the correct balanced chemical equation?
Given the following reaction: Aluminium hydroxide and acetic acid react to produce aluminium acetate and water. What is the balanced chemical equation?
Given the following reaction: Aluminium hydroxide and acetic acid react to produce aluminium acetate and water. What is the balanced chemical equation?
Ammonia and oxygen react to produce nitrogen monoxide and water. What is the balanced chemical equation for this reaction?
Ammonia and oxygen react to produce nitrogen monoxide and water. What is the balanced chemical equation for this reaction?
What are the products of the double-replacement reaction between zinc(II) nitrate and sodium hydroxide?
What are the products of the double-replacement reaction between zinc(II) nitrate and sodium hydroxide?
Identify the products of the following double replacement reaction: $Pb(NO_3)_2 + KBr \rightarrow $
Identify the products of the following double replacement reaction: $Pb(NO_3)_2 + KBr \rightarrow $
Consider the double-replacement reaction between sodium carbonate and strontium nitrite. What are the products?
Consider the double-replacement reaction between sodium carbonate and strontium nitrite. What are the products?
Predict the products of the double-replacement reaction between ammonium sulfate and barium nitrate.
Predict the products of the double-replacement reaction between ammonium sulfate and barium nitrate.
If Aluminium reacts with hydrochloric acid, what are the products?
If Aluminium reacts with hydrochloric acid, what are the products?
What occurs in a single-replacement reaction?
What occurs in a single-replacement reaction?
Consider the law of conservation of mass. In a balanced chemical equation, what must be equal on both sides of the equation?
Consider the law of conservation of mass. In a balanced chemical equation, what must be equal on both sides of the equation?
Ethane, $C_2H_6$, reacts with oxygen to make carbon dioxide and water. What is the balanced chemical equation for this reaction?
Ethane, $C_2H_6$, reacts with oxygen to make carbon dioxide and water. What is the balanced chemical equation for this reaction?
Given the following unbalanced equation: $N_2O_5(g) \rightarrow NO_2(g) + O_2(g)$. When balanced, what is the coefficient in front of $NO_2(g)$?
Given the following unbalanced equation: $N_2O_5(g) \rightarrow NO_2(g) + O_2(g)$. When balanced, what is the coefficient in front of $NO_2(g)$?
Methane burns in oxygen. What is the balanced chemical equation for this reaction?
Methane burns in oxygen. What is the balanced chemical equation for this reaction?
Flashcards
Chemical equation
Chemical equation
A written description of what happens during a chemical reaction.
Reactants
Reactants
The starting materials in a chemical reaction.
Products
Products
Substances that are made in a chemical reaction.
Subscripts
Subscripts
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Coefficients
Coefficients
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State of Matter
State of Matter
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Balanced Equation
Balanced Equation
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Law of Conservation of Mass
Law of Conservation of Mass
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Single-Replacement Reaction
Single-Replacement Reaction
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Halogen Activity Series
Halogen Activity Series
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Double-Replacement Reactions
Double-Replacement Reactions
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Diatomic Molecules
Diatomic Molecules
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Study Notes
- Chemical equations provide written descriptions of chemical reactions
- Reactants are on the left side of the equation while products are on the right, this is separated by an arrow to indicate the reaction's direction
Balanced Chemical Equations
- Satisfies the Law of Conservation of Mass
- Mass is neither created nor destroyed in chemical reactions; the number of atoms for each element remain the same on both sides of the equation
How to Balance Chemical Equations
- Write the unbalanced equation showing reactants and products
- Note the number of atoms of each element on each side of the reaction arrow
- Add coefficients to balance atoms of each element on both sides; balancing hydrogen and oxygen atoms should be saved for last
- Indicate the state of matter for reactants/products to finalize work
- "Sodium metal reacts with water to produce sodium hydroxide and hydrogen" translates to sodium and water as reactants, and sodium hydroxide with hydrogen as products
- Magnesium hydroxide and hydrochloric acid react to produce magnesium chloride and water
Equations to Balance
- Fe + O2 → Fe2O3
- H2 + O2 → H2O
- Hydrogen and chlorine react to make HCl
- Nitrogen and hydrogen react at elevated temperature and pressure to produce ammonia
- Ethane (C2H6) reacts with oxygen to make carbon dioxide and water
Equations with Formulas to Balance
- KI(aq) + Br2(l) → KBr(aq) + I2(s)
- MnO2(s) + HCl(aq) → MnCl2(aq) + Cl2(g) + H2O(l)
- Na2O(s) + H2O(l) → NaOH(aq)
- Cu(s) + AgNO3(aq) → Cu(NO3)2(aq) + Ag(s)
- SO2(g) + H2O(l) → H2SO3(aq)
- S2Cl2(l) + NH3(l) → S4N4(s) + S8(s) + NH4Cl(s)
- Be(s) + O2(g) → BeO(s)
- N2O3(g) + H2O(l) → HNO2(aq)
- Na(s) + H2O(l) → NaOH(aq) + H2(g)
- CaO(s) + HCl(aq) → CaCl2(aq) + H2O(l)
- CH3NH2(g) + O2(g) → H2O(g) + CO2(g) + N2(g)
- Fe(s) + H2SO4(aq) → FeSO4(aq) + H2(g)
- N2O5(g) → NO2(g) + O2(g)
- NaNO3(s) → NaNO2(s) + O2(g)
- Al(s) + NH4NO3(s) → N2(g) + H2O(l) + Al2O3(s)
- C3H5N3O9(l) → CO2(g) + N2(g) + H2O(g) + O2(g)
- IO2F(s) + BrF3(l) → IF5(l) + Br2(l) + O2(g)
- H2S(g) + O2(g) → H2O(l) + S8(s)
- KCl(aq) + HNO3(aq) + O2(g) → KNO3(aq) + Cl2(g) + H2O(l)
- NH3(g) + O2(g) → NO(g) + H2O(g)
- CH4(g) + O2(g) → CO(g) + H2(g)
- NaF(aq) + Th(NO3)4(aq) → NaNO3(aq) + ThF4(s)
- Ca5(PO4)3F(s) + H2SO4(aq) + H2O(l) → H3PO4(aq) + CaSO4·2H2O(s) + HF(aq)
- NaCl(aq) + H2SO4(aq) → Na2SO4(aq) + HCl(g)
- K(s) + H2O(l) → KOH(aq) + H2(g)
- S8(s) + Cl2(g) → S2Cl2(l)
- CH3OH(l) + I2(s) + P4(s) → CH3I(l) + H3PO4(aq) + H2O(l)
- (CH3)3Al(s) + H2O(l) → CH4(g) + Al(OH)3(s)
Reactions to Balance
- Aluminium reacts with bromine
- Aluminium reacts with Oxygen
- Sodium reacts with chlorine
- Hydrogen and chlorine react to make HCl
- Ethane (C2H6) reacts with oxygen to make carbon dioxide and water
- Aluminium hydroxide and acetic acid react to produce aluminum acetate and water
- Ammonia and oxygen react to produce nitrogen monoxide and water
- Nitrogen and hydrogen react at elevated temperature and pressure to produce ammonia
- An aqueous solution of barium chloride reacts with a solution of sodium sulfate
- Magnesium burns in oxygen
- Carbon dioxide and sodium oxide react to produce sodium carbonate
- Aluminium reacts with hydrochloric acid
- An aqueous solution of silver nitrate reacts with a solution of potassium chloride
- Methane burns in oxygen
- Sodium nitrate and sulfuric acid react to produce sodium sulfate and nitric acid
Single-Replacement Reaction
- Chemical reaction where one element substitutes for another in a compound to generate a new element and compound
- General examples:
- 2HCl(aq) + Zn(s) → ZnCl2(aq) + H2(g)
- 2NaCl(aq) + F2(g) → 2NaF(s) + Cl2(g)
- A typical characteristic of single-replacement is that there is one element as a reactant and another as a product
- Fluorine, chlorine, bromine, and iodine help demonstrate reactions - not all single-replacement reactions occur between reactants
- Elements higher in the halogen column on the periodic table will replace those below but not vice versa
Predicting Single Replacement Reactions
- CaI2(s) + Cl2(g) → CaCl2(s) + I2(s)
- CaF2(s) + Br2(ℓ) → CaBr2(s) + F2(g)
- MgCl2 + I2 →
- CaBr2 + F2 →
- FeI2 + Cl2 →
Double-Replacement Reaction
- Occurs when parts of two ionic compounds are exchanged, the reactants and products are 2 new compounds
- CuCl2(aq) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2AgCl(s)
- BaCl2 + Na2SO4 →
- KBr + AgNO3 →
Predicting Products
- Zn + Fe(NO3)2 →
- F2 + FeI3 →
- Li + MgSO4 →
- NaBr + Cl2 →
- Sn + H2SO4 →
- Al + NiBr2 →
- Mg + HCl →
- HI + Br2 →
- FeCl2 + Br2 →
- Fe(NO3)3 + Al →
- Zn(NO3)2 + NaOH →
- HCl + Na2S →
- Na2CO3 + Sr(NO2)2 →
- Pb(NO3)2 + KBr →
- K2O + MgCO3 →
- Sn(OH)2 + FeBr3 →
- CsNO3 + KCl →
- Na2CO3 + Sr(NO2)2 →
- (NH4)2SO4 + Ba(NO3)2 →
- NaOH + MgCl2 →
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