Classify each of the following reactions as decomposition (D), combination $$ (\mathrm{C}) $$, single-replacement (SR), or double- replacement (DR): a. $$ 2 \mathrm{KClO}_{3}(s) \xrightarrow{\Delta} 2 \mathrm{KCl}(s)+3 \mathrm{O}_{2}(g) $$ b. $$ \mathrm{K}_{2} \mathrm{CO}_{3}(a q)+\mathrm{Ca}(\mathrm{OH})_{2}(a q) \longrightarrow \mathrm{CaCO}_{3}(s)+2 \mathrm{KOH}(a q) $$ c. $$ \mathrm{CaO}(a q)+\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2}(a q) $$ d. $$ \mathrm{Ca}(s)+\mathrm{Sn}\left(\mathrm{NO}_{3}\right)_{2}(a q) \longrightarrow \mathrm{Sn}(a q)+\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}(a q) $$

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**a.** The reaction is  
$$
2 \mathrm{KClO}_{3}(s) \xrightarrow{\Delta} 2 \mathrm{KCl}(s)+3 \mathrm{O}_{2}(g)
$$  
This reaction involves one compound breaking down into two or more products when heated. Thus, it is a decomposition reaction (D).

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**b.** The reaction is  
$$
\mathrm{K}_{2} \mathrm{CO}_{3}(aq)+\mathrm{Ca}(\mathrm{OH})_{2}(aq) \longrightarrow \mathrm{CaCO}_{3}(s)+2 \mathrm{KOH}(aq)
$$  
Ions in the reactants swap partners to form new compounds (calcium carbonate and potassium hydroxide). This is a double-replacement reaction (DR).

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**c.** The reaction is  
$$
\mathrm{CaO}(aq)+\mathrm{H}_{2}\mathrm{O}(l) \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2}(aq)
$$  
Here, two reactants combine to produce a single compound. Therefore, this is classified as a combination reaction (C).

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**d.** The reaction is  
$$
\mathrm{Ca}(s)+\mathrm{Sn}\left(\mathrm{NO}_{3}\right)_{2}(aq) \longrightarrow \mathrm{Sn}(aq)+\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}(aq)
$$  
In this reaction, the element calcium replaces the tin in the tin nitrate compound. This is characteristic of a single-replacement reaction (SR).
a. Decomposition (D) b. Double-replacement (DR) c. Combination (C) d. Single-replacement (SR)

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