Chemical Reactions & Equations Knowledge-Based Download PDF

Questions

1. 1.

   Which statement correctly distinguishes a single replacement reaction from a double replacement reaction?

   • A) In a single replacement reaction, two ionic compounds exchange ions, whereas in a double replacement reaction, a free element displaces an element from a compound.
   • B) In a single replacement reaction, an uncombined element displaces another element from a compound, whereas in a double replacement reaction, two compounds exchange ions to form two new compounds.
   • C) In a single replacement reaction, a single compound breaks down into two or more substances, whereas in a double replacement reaction, two simple substances combine to form a single compound.
   • D) In a single replacement reaction, a hydrocarbon reacts with molecular oxygen, whereas in a double replacement reaction, an element combines directly with oxygen gas.
2. 2.

   Which of the following chemical equations represents a combustion reaction?

   • A) $2\text{Al}(s) + 3\text{CuCl}_2(aq) \rightarrow 2\text{AlCl}_3(aq) + 3\text{Cu}(s)$
   • B) $\text{CaCO}_3(s) \rightarrow \text{CaO}(s) + \text{CO}_2(g)$
   • 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.

   Which of the following chemical equations represents a decomposition reaction?

   • A) $2\text{Mg}(s) + \text{O}_2(g) \rightarrow 2\text{MgO}(s)$
   • B) $2\text{KClO}_3(s) \rightarrow 2\text{KCl}(s) + 3\text{O}_2(g)$
   • 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) $\text{AgNO}_3(aq) + \text{NaCl}(aq) \rightarrow \text{AgCl}(s) + \text{NaNO}_3(aq)$
4. 4.

   Which type of chemical reaction is represented by the equation $\text{BaCl}_2(aq) + \text{Na}_2\text{SO}_4(aq) \rightarrow \text{BaSO}_4(s) + 2\text{NaCl}(aq)$?

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

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

   • A) $2\text{H}_2(g) + \text{O}_2(g) \rightarrow 2\text{H}_2\text{O}(l)$
   • B) $\text{Zn}(s) + 2\text{HCl}(aq) \rightarrow \text{ZnCl}_2(aq) + \text{H}_2(g)$
   • C) $\text{AgNO}_3(aq) + \text{NaCl}(aq) \rightarrow \text{AgCl}(s) + \text{NaNO}_3(aq)$
   • D) $\text{CH}_4(g) + 2\text{O}_2(g) \rightarrow \text{CO}_2(g) + 2\text{H}_2\text{O}(g)$