Balancing Chemical Equations
Chemistry ⇒ Chemical Reactions and Equations
Balancing Chemical Equations starts at 9 and continues till grade 12.
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See sample questions for grade 11
A student balances the equation: H2 + Cl2 → 2HCl. How many molecules of H2 are needed to react with 4 molecules of Cl2?
A student writes the following unbalanced equation: Na + H2O → NaOH + H2. What are the correct coefficients to balance this equation?
Balance the following equation: Fe + H2SO4 → Fe2(SO4)3 + H2
Describe the steps you would take to balance a chemical equation.
Explain why balancing chemical equations is important in chemical reactions.
A student balances the equation: H2 + Cl2 → 2HCl. How many molecules of H2 are needed to react with 4 molecules of Cl2?
A student writes the following equation: Zn + HCl → ZnCl2 + H2. Is this equation balanced?
A student writes the following unbalanced equation: Na + H2O → NaOH + H2. What are the correct coefficients to balance this equation?
Which of the following equations is balanced?
(1) CH4 + 2O2 → CO2 + 2H2O
(2) CH4 + O2 → CO2 + H2O
(3) 2CH4 + 3O2 → 2CO2 + 4H2O
(4) CH4 + 2O2 → CO + 2H2O
Which of the following is NOT a correct step in balancing a chemical equation?
(1) Changing the subscripts of compounds
(2) Adjusting coefficients
(3) Counting atoms of each element
(4) Ensuring the same number of atoms on both sides
Which of the following is the correct balanced equation for the combustion of sulfur?
(1) S + O2 → SO2
(2) 2S + O2 → 2SO2
(3) S + 2O2 → SO4
(4) S + O2 → SO3
Which of the following is the correct balanced equation for the reaction between hydrogen and oxygen to form water?
(1) H2 + O2 → H2O
(2) 2H2 + O2 → 2H2O
(3) H2 + 2O2 → 2H2O
(4) 2H2 + 2O2 → 2H2O
Balance the following equation: ___AgNO3 + ___Cu → ___Cu(NO3)2 + ___Ag
Balance the following equation: ___Al + ___O2 → ___Al2O3
Balance the following equation: ___C2H5OH + ___O2 → ___CO2 + ___H2O
Balance the following equation: ___Ca(OH)2 + ___H3PO4 → ___Ca3(PO4)2 + ___H2O
A student writes the following equation: Zn + HCl → ZnCl2 + H2. Is this equation balanced?
True or False: The coefficients in a balanced chemical equation represent the relative number of moles of each substance involved in the reaction.
True or False: The law of conservation of mass is always obeyed when balancing chemical equations.
True or False: The total number of atoms of each element must be the same on both sides of a balanced chemical equation.
