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Questions and Answers
What is the initial number of iron atoms in the reactants of the given chemical equation?
What is the initial number of iron atoms in the reactants of the given chemical equation?
How many total hydrogen atoms are present in the products of the balanced equation?
How many total hydrogen atoms are present in the products of the balanced equation?
Which method is used to balance the given chemical equation?
Which method is used to balance the given chemical equation?
In the balanced equation 3Fe + 4H2O → Fe3O4 + 4H2, what is the physical state information provided?
In the balanced equation 3Fe + 4H2O → Fe3O4 + 4H2, what is the physical state information provided?
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What is the number of water molecules present in the reactants for the final balanced equation?
What is the number of water molecules present in the reactants for the final balanced equation?
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To balance iron (Fe) in the equation 3Fe + 4H2O → Fe3O4 + 4H2, how many iron atoms are needed on the reactant side?
To balance iron (Fe) in the equation 3Fe + 4H2O → Fe3O4 + 4H2, how many iron atoms are needed on the reactant side?
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What is the final balanced equation represented in the content?
What is the final balanced equation represented in the content?
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Which element is stated as the last to be balanced in the given equation?
Which element is stated as the last to be balanced in the given equation?
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What does the symbol (aq) indicate in a chemical equation?
What does the symbol (aq) indicate in a chemical equation?
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In the equation 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g), what does the (g) next to H2O signify?
In the equation 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g), what does the (g) next to H2O signify?
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Which of the following conditions is commonly indicated above or below the arrow in a balanced chemical equation?
Which of the following conditions is commonly indicated above or below the arrow in a balanced chemical equation?
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What is the primary reason for balancing chemical equations?
What is the primary reason for balancing chemical equations?
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What is the correct balanced equation for the reaction of hydrogen and chlorine to form hydrogen chloride?
What is the correct balanced equation for the reaction of hydrogen and chlorine to form hydrogen chloride?
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If the balanced equation for sodium reacting with water is written as 2Na + 2H2O → 2NaOH + H2, what does the coefficient '2' before Na and H2O indicate?
If the balanced equation for sodium reacting with water is written as 2Na + 2H2O → 2NaOH + H2, what does the coefficient '2' before Na and H2O indicate?
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In the reaction 6CO2(aq) + 12H2O(l) → C6H12O6(aq) + 6O2(aq) + 6H2O(l), what is the role of chlorophyll?
In the reaction 6CO2(aq) + 12H2O(l) → C6H12O6(aq) + 6O2(aq) + 6H2O(l), what is the role of chlorophyll?
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Which of the following correctly represents the physical state of barium sulfate in the equation BaCl2 + Al2(SO4)3 → 3BaSO4 + 2AlCl3?
Which of the following correctly represents the physical state of barium sulfate in the equation BaCl2 + Al2(SO4)3 → 3BaSO4 + 2AlCl3?
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What is a skeletal chemical equation?
What is a skeletal chemical equation?
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Which law is crucial for balancing a chemical equation?
Which law is crucial for balancing a chemical equation?
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In the reaction Zn + H2SO4 → ZnSO4 + H2, how many hydrogen atoms are present in the products?
In the reaction Zn + H2SO4 → ZnSO4 + H2, how many hydrogen atoms are present in the products?
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What should be done first when balancing the equation Fe + H2O → Fe3O4 + H2?
What should be done first when balancing the equation Fe + H2O → Fe3O4 + H2?
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How many sulfur atoms are present in the equation Zn + H2SO4 → ZnSO4 + H2?
How many sulfur atoms are present in the equation Zn + H2SO4 → ZnSO4 + H2?
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Why do we need to balance a skeletal chemical equation?
Why do we need to balance a skeletal chemical equation?
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In the balanced equation Zn + H2SO4 → ZnSO4 + H2, how are the oxygen atoms counted?
In the balanced equation Zn + H2SO4 → ZnSO4 + H2, how are the oxygen atoms counted?
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How many total atoms are present in the reactants of the equation Fe + H2O → Fe3O4 + H2?
How many total atoms are present in the reactants of the equation Fe + H2O → Fe3O4 + H2?
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Study Notes
Chemical Equations
- A skeletal chemical equation is unbalanced, indicating unequal mass on both sides.
- The law of conservation of mass states that mass cannot be created or destroyed in a reaction.
- Total mass of products must equal the total mass of reactants, reflecting equal atom counts for each element.
Balancing Chemical Equations
- Example of a balanced equation:
Zn + H₂SO₄ → ZnSO₄ + H₂- Atom count: Zn (1), H (2), S (1), O (4) is consistent on both sides.
- To balance an equation, the number of each type of atom must match on the reactant and product sides.
Steps to Balance Equations
- Draw boxes around formulas to isolate elements.
- For the equation Fe + H₂O → Fe₃O₄ + H₂:
- Start with element counts: Fe (1), O (1), H (2) on LHS versus Fe (3), O (4), H (2) on RHS.
- Initial step for physical states includes (g), (l), (aq), and (s) for gaseous, liquid, aqueous, and solid states respectively.
Example of Balancing
- Begin with the partly balanced equation:
3Fe + 4H₂O → Fe₃O₄ + 4H₂ - Verify atom counts to ensure balance:
- Fe: LHS (3), RHS (3)
- H: LHS (8), RHS (8)
- O: LHS (4), RHS (4)
Including Physical States
- A balanced equation's clarity increases by specifying reactant and product states.
- Example with physical states:
3Fe(s) + 4H₂O(g) → Fe₃O₄(s) + 4H₂(g)
Techniques for Balancing
- Hit-and-trial method emphasizes using the smallest whole number coefficients to achieve balance.
- Ensure all elements are checked after each adjustment to maintain equality across the equation.
Questions for Practice
- Importance of cleaning magnesium before burning: Removes oxidation for accurate reaction.
- Balanced equations for specified reactions:
- Hydrogen + Chlorine → Hydrogen chloride: H₂ + Cl₂ → 2HCl
- Barium chloride + Aluminum sulfate → Barium sulfate + Aluminum chloride: BaCl₂ + Al₂(SO₄)₃ → BaSO₄ + 2AlCl₃
- Sodium + Water → Sodium hydroxide + Hydrogen: 2Na + 2H₂O → 2NaOH + H₂
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Description
Test your understanding of chemical equations with this quiz covering skeletal and balanced chemical equations. You will be assessed on the law of conservation of mass and its implications in chemical reactions. Perfect for students revisiting basic chemistry concepts.
