Question

if you visit a cave, you may notice icicle - shaped rocks called stalactites hanging from the caves ceiling. stalactites form when water that contains minerals drips from the caves ceiling. the dripping water leaves behind deposits of limestone, which is made mostly of calcium carbonate (caco₃). calcium carbonate forms, along with carbon dioxide gas (co₂), when calcium bicarbonate (cah₂c₂o₆) in the water breaks down. the limestone deposits build up over thousands of years, eventually forming stalactites.
in the chemical reaction described in the passage, which of the following are products? select all that apply.

• calcium bicarbonate (cah₂c₂o₆)
• calcium carbonate (caco₃)
• carbon dioxide (co₂)

Explanation:

In a chemical reaction, products are the substances formed from reactants. The passage states calcium bicarbonate breaks down to form calcium carbonate and carbon dioxide. So calcium bicarbonate is the reactant, while the other two are products.

Answer:

• calcium carbonate ($\text{CaCO}_3$)
• carbon dioxide ($\text{CO}_2$)