Question

methane is a compound that is a component of natural gas. natural gas is used in furnaces to heat homes through the chemical reaction shown below.

$$\\text{methane} + \\text{oxygen} \ ightarrow \\text{carbon dioxide} + \\text{water}$$

question 15

which of the following rows identifies a reactant and a compound in the chemical reaction described?

row	reactant	compound
b	methane	carbon dioxide
c	water	oxygen
d	water	carbon dioxide

Explanation:

Identify the reactants in the chemical equation

The chemical equation is:

$$\text{methane} + \text{oxygen} ightarrow \text{carbon dioxide} + \text{water}$$

Reactants are the starting substances on the left side of the arrow. Thus, the reactants are methane and oxygen.

Identify the compounds in the chemical reaction

A compound is a substance formed when two or more chemical elements are chemically bonded together.

• Methane (\(\text{CH}_4\)), carbon dioxide (\(\text{CO}_2\)), and water (\(\text{H}_2\text{O}\)) are compounds.
• Oxygen (\(\text{O}_2\)) is an element, not a compound.

Match with the given options

We need a row where:

• The "Reactant" column contains either Methane or Oxygen.
• The "Compound" column contains either Methane, Carbon dioxide, or Water.

Let's evaluate each row:

• Row 1: Reactant = Methane (correct), Compound = Oxygen (incorrect, oxygen is an element).
• Row 2: Reactant = Methane (correct), Compound = Carbon dioxide (correct, carbon dioxide is a compound).
• Row 3: Reactant = Water (incorrect, water is a product), Compound = Oxygen (incorrect).
• Row 4: Reactant = Water (incorrect), Compound = Carbon dioxide (correct).

Therefore, Row 2 correctly identifies a reactant and a compound.

Answer:

• Row 1: Reactant = Methane, Compound = Oxygen
• Row 2: Reactant = Methane, Compound = Carbon dioxide (Correct answer)
• Row 3: Reactant = Water, Compound = Oxygen
• Row 4: Reactant = Water, Compound = Carbon dioxide