Question

which type of chemical reaction occurs in ca + cl2 → cacl2?
synthesis
combustion
single replacement
double replacement

Explanation:

A synthesis reaction is when two or more reactants combine to form a single product. In the reaction \( \text{Ca} + \text{Cl}_2
ightarrow \text{CaCl}_2 \), calcium (Ca) and chlorine gas (\( \text{Cl}_2 \)) combine to form calcium chloride (\( \text{CaCl}_2 \)), which fits the synthesis reaction definition. Combustion involves a substance reacting with oxygen, single replacement has one element replacing another in a compound, and double replacement involves two compounds exchanging ions—none of these match here.

Answer:

A. synthesis