Classify each of the reactions described by the following...

Classify each of the reactions described by the following chemical equations as combination, decomposition, single replacement, or double replacement. (a) $\mathrm{CaCO}_{3}(s) \rightarrow \mathrm{CaO}(s)+\mathrm{CO}_{2}(g)$ (b) $\mathrm{NH}_{3}(g)+\mathrm{HCl}(g) \rightarrow \mathrm{NH}_{4} \mathrm{Cl}(s)$ (c) $2 \mathrm{AgBr}(s)+\mathrm{Cl}_{2}(g) \rightarrow 2 \mathrm{AgCl}(s)+\mathrm{Br}_{2}(l)$ (d) $\mathrm{Ag}_{2} \mathrm{SO}_{4}(s)+2 \mathrm{NaI}(a q) \rightarrow 2 \mathrm{AgI}(s)+\mathrm{Na}_{2} \mathrm{SO}_{4}(a q)$

Classify each of the reactions described by the following chemical equations as combination, decomposition, single replacement, or double replacement.
(a) $\mathrm{CaCO}_{3}(s) \rightarrow \mathrm{CaO}(s)+\mathrm{CO}_{2}(g)$
(b) $\mathrm{NH}_{3}(g)+\mathrm{HCl}(g) \rightarrow \mathrm{NH}_{4} \mathrm{Cl}(s)$
(c) $2 \mathrm{AgBr}(s)+\mathrm{Cl}_{2}(g) \rightarrow 2 \mathrm{AgCl}(s)+\mathrm{Br}_{2}(l)$
(d) $\mathrm{Ag}_{2} \mathrm{SO}_{4}(s)+2 \mathrm{NaI}(a q) \rightarrow 2 \mathrm{AgI}(s)+\mathrm{Na}_{2} \mathrm{SO}_{4}(a q)$

Key Concepts

Combination Reaction

A combination reaction is one in which two or more reactants combine to form a single product. These types of reactions are often characterized by the formation of a new compound from simpler substances, reflecting the idea that the parts are ‘combining’ to make something more complex.

Decomposition Reaction

In a decomposition reaction, a single compound breaks down into two or more simpler substances, often producing elements and simpler compounds. This type of reaction is essentially the reverse of a combination reaction and is commonly observed when energy is applied, such as in thermal decomposition.

Single Replacement Reaction

A single replacement reaction involves an element reacting with a compound and replacing one of the elements within that compound. The displaced element is released as a free element, while the reactive element takes its place, reflecting the reactivity series and substitution process.

Double Replacement Reaction

Double replacement reactions occur when two compounds exchange parts, forming two new compounds. This reaction type typically involves the exchange of ions between the reactants, and is commonly seen in aqueous solutions where the driving force for the reaction might be the formation of a precipitate, gas, or weak electrolyte.

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