Question

question 8 (5 points) the following reaction is an example of ______. na2co3 + cacl2 → 2nacl + caco3 a) combination b) decomposition c) single - displacement d) double - displacement

Explanation:

In the reaction $\ce{Na2CO3 + CaCl2 -> 2NaCl + CaCO3}$, the cations ($\ce{Na+}$ and $\ce{Ca^2+}$) and anions ($\ce{CO3^2-}$ and $\ce{Cl-}$) of the two reactants exchange places. This matches the definition of a double - displacement reaction, where two compounds exchange ions to form two new compounds. A combination reaction involves combining substances into one, a decomposition reaction breaks a compound into simpler substances, and a single - displacement reaction involves one element displacing another in a compound.

Answer:

d) double - displacement