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Balancing Chemical Reactions

This worksheet covers Balancing Chemical Reactions, which is part of the Chemical Reactions module in the Chemistry course. Practice problems are designed to strengthen key concepts and build confidence.

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Balancing Chemical Reactions

Chemical Reactions • Chemistry

Set 1 — Foundation

What is the balanced equation for the combustion of propane ( $C_{3}H_{8}$ )?

$C_{3}H_{8} + 5O_{2} \rightarrow 3CO_{2} + 4H_{2}O$

$C_{3}H_{8} + 3O_{2} \rightarrow 3CO_{2} + 2H_{2}O$

$C_{3}H_{8} + 4O_{2} \rightarrow 3CO + 4H_{2}O$

$C_{3}H_{8} + 6O_{2} \rightarrow 3CO_{2} + 6H_{2}O$

Which of the following is the balanced equation for the reaction of magnesium with hydrochloric acid?

$Mg + 2HCl \rightarrow MgCl_{2} + H_{2}$

$Mg + HCl \rightarrow MgCl_{2} + H_{2}$

$2Mg + 2HCl \rightarrow 2MgCl_{2} + H_{2}$

$Mg + H_{2} + Cl_{2} \rightarrow MgCl_{2}$

What is the balanced equation for the reaction of sodium with water?

$2Na + 2H_{2}O \rightarrow 2NaOH + H_{2}$

$Na + H_{2}O \rightarrow NaOH + H_{2}$

$Na + 2H_{2}O \rightarrow NaOH + H_{2}$

$2Na + H_{2}O \rightarrow 2NaOH$

How is the equation $Fe + O_{2} \rightarrow Fe_{2}O_{3}$ balanced?

$4Fe + 3O_{2} \rightarrow 2Fe_{2}O_{3}$

$2Fe + O_{2} \rightarrow Fe_{2}O_{3}$

$3Fe + O_{2} \rightarrow Fe_{2}O_{3}$

$Fe + O_{2} \rightarrow 3Fe_{2}O_{3}$

What is the balanced equation for the decomposition of hydrogen peroxide ( $H_{2}O_{2}$ )?

$2H_{2}O_{2} \rightarrow 2H_{2}O + O_{2}$

$H_{2}O_{2} \rightarrow H_{2}O + O_{2}$

$H_{2}O_{2} \rightarrow 2H_{2}O + O_{2}$

$2H_{2}O_{2} \rightarrow H_{2}O + O_{2}$

Which of the following is the balanced equation for the formation of ammonia ( $NH_{3}$ ) from nitrogen and hydrogen?

$N_{2} + 3H_{2} \rightarrow 2NH_{3}$

$N_{2} + H_{2} \rightarrow NH_{3}$

$2N_{2} + 6H_{2} \rightarrow 4NH_{3}$

$N_{2} + 2H_{2} \rightarrow NH_{3}$

What is the balanced equation for the reaction of aluminum with oxygen to form aluminum oxide ( $Al_{2}O_{3}$ )?

$4Al + 3O_{2} \rightarrow 2Al_{2}O_{3}$

$2Al + 3O_{2} \rightarrow Al_{2}O_{3}$

$Al + O_{2} \rightarrow Al_{2}O_{3}$

$4Al + O_{2} \rightarrow 2Al_{2}O_{3}$

Which is the correct balanced equation for the reaction of calcium carbonate ( $CaCO_{3}$ ) decomposing into calcium oxide ( $CaO$ ) and carbon dioxide ( $CO_{2}$ )?

$CaCO_{3} \rightarrow CaO + CO_{2}$

$2CaCO_{3} \rightarrow CaO + CO_{2}$

$CaCO_{3} \rightarrow 2CaO + CO_{2}$

$2CaCO_{3} \rightarrow 2CaO + 2CO_{2}$

What is the balanced equation for the reaction of zinc with sulfuric acid ( $H_{2}SO_{4}$ )?

$Zn + H_{2}SO_{4} \rightarrow ZnSO_{4} + H_{2}$

$Zn + 2H_{2}SO_{4} \rightarrow ZnSO_{4} + H_{2}$

$Zn + H_{2}SO_{4} \rightarrow ZnSO_{4} + 2H_{2}$

$Zn + H_{2}SO_{4} \rightarrow ZnSO_{4} + 3H_{2}$

10.

What is the balanced equation for the reaction of iron(III) chloride ( $FeCl_{3}$ ) with sodium hydroxide ( $NaOH$ )?

$FeCl_{3} + 3NaOH \rightarrow Fe(OH)_{3} + 3NaCl$

$FeCl_{3} + NaOH \rightarrow Fe(OH)_{3} + NaCl$

$FeCl_{3} + 2NaOH \rightarrow Fe(OH)_{3} + 2NaCl$

$FeCl_{3} + 3NaOH \rightarrow Fe(OH)_{3} + NaCl$

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