Chemical Reactions & Equations Knowledge-Based Practice

Questions

1. 1.

   Which of the following balanced chemical equations represents a synthesis reaction?

   • A) $\text{CaCO}_3(s) \rightarrow \text{CaO}(s) + \text{CO}_2(g)$
   • B) $\text{Zn}(s) + \text{CuSO}_4(aq) \rightarrow \text{ZnSO}_4(aq) + \text{Cu}(s)$
   • C) $\text{HCl}(aq) + \text{NaOH}(aq) \rightarrow \text{NaCl}(aq) + \text{H}_2\text{O}(l)$
   • D) $\text{N}_2(g) + 3\text{H}_2(g) \rightarrow 2\text{NH}_3(g)$
2. 2.

   Which of the following chemical equations represents a complete combustion reaction?

   • A) $\text{CaCO}_3(s) \rightarrow \text{CaO}(s) + \text{CO}_2(g)$
   • B) $2\text{Al}(s) + 3\text{CuSO}_4(aq) \rightarrow \text{Al}_2(\text{SO}_4)_3(aq) + 3\text{Cu}(s)$
   • C) $\text{C}_3\text{H}_8(g) + 5\text{O}_2(g) \rightarrow 3\text{CO}_2(g) + 4\text{H}_2\text{O}(g)$
   • D) $\text{AgNO}_3(aq) + \text{NaCl}(aq) \rightarrow \text{AgCl}(s) + \text{NaNO}_3(aq)$
3. 3.

   In which type of chemical reaction do the cations and anions of two distinct ionic compounds in aqueous solution exchange places to form two new compounds?

   • A) Double replacement
   • B) Single replacement
   • C) Synthesis
   • D) Decomposition
4. 4.

   The chemical equation $2\text{H}_2\text{O}_2(aq) \rightarrow 2\text{H}_2\text{O}(l) + \text{O}_2(g)$ represents which type of chemical reaction?

   • A) Synthesis
   • B) Decomposition
   • C) Single replacement
   • D) Double replacement
5. 5.

   Which of the following chemical equations represents a single replacement reaction?

   • A) $2\text{Mg}(s) + \text{O}_2(g) \rightarrow 2\text{MgO}(s)$
   • B) $\text{CaCO}_3(s) \rightarrow \text{CaO}(s) + \text{CO}_2(g)$
   • C) $\text{Cl}_2(g) + 2\text{KBr}(aq) \rightarrow 2\text{KCl}(aq) + \text{Br}_2(l)$
   • D) $\text{AgNO}_3(aq) + \text{NaCl}(aq) \rightarrow \text{AgCl}(s) + \text{NaNO}_3(aq)$

Answers and step-by-step solutions appear after you finish the test.