Question

1. solid calcium carbonate breaks down into solid calcium oxide and carbon dioxide gas.

reactants:
products:
balanced equation:

Explanation:

Step1: Identify the reactant

The problem states solid calcium carbonate is the substance breaking down, so this is the only reactant.

Step2: Identify the products

The reaction produces solid calcium oxide and carbon dioxide gas, so these are the products.

Step3: Write and balance the equation

First write the unbalanced equation, then check atom counts: Ca, C, O are already balanced 1:1:3 on both sides.

$$\text{CaCO}_3(s) ightarrow \text{CaO}(s) + \text{CO}_2(g)$$

Answer:

Reactants: Solid calcium carbonate ($\text{CaCO}_3$)
Products: Solid calcium oxide ($\text{CaO}$), carbon dioxide gas ($\text{CO}_2$)
Balanced equation: $\text{CaCO}_3(s) \xrightarrow{\Delta} \text{CaO}(s) + \text{CO}_2(g)$