Question

Write the molecular formula of calcium carbonate.

Hint:

Calcium carbonate (\(CaCO_3\)) is commonly found in limestone, chalk, and marble. It is used in construction, medicine (as an antacid), and as a key ingredient in cement.

Answer 1

Step 1: Understanding calcium carbonate
Calcium carbonate is a chemical compound composed of calcium (\(\text{Ca}\)), carbon (\(\text{C}\)), and oxygen (\(\text{O}\)). 
Step 2: Writing the molecular formula 
- Calcium (\(\text{Ca}^{2+}\)) is a divalent cation. - Carbonate (\(\text{CO}_3^{2-}\)) is a polyatomic anion. - Since their charges balance each other (\(+2\) and \(-2\)), they combine in a 1:1 ratio, forming the molecular formula \(\text{CaCO}_3\). Thus, the correct molecular formula of calcium carbonate is \(\text{CaCO}_3\).