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 14

which of the following rows identifies the type of chemical reaction described and classifies the reaction as endothermic or exothermic?

\

$$\begin{array}{|c|l|l|} \\hline \\textbf{row} & \\textbf{type of chemical reaction} & \\textbf{classification} \\\\ \\hline \\bigcirc & \\text{corrosion} & \\text{exothermic} \\\\ \\hline \\bigcirc & \\text{corrosion} & \\text{endothermic} \\\\ \\hline \\bigcirc & \\text{combustion} & \\text{exothermic} \\\\ \\hline \\bigcirc & \\text{combustion} & \\text{endothermic} \\\\ \\hline \\end{array}$$

Explanation:

Identify the type of chemical reaction

The problem describes the reaction of methane with oxygen to produce carbon dioxide and water:

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

A reaction where a substance reacts rapidly with oxygen, releasing heat and light, is classified as a combustion reaction.

Classify the reaction as endothermic or exothermic

Using the Exothermic Reaction and Endothermic Reaction knowledge points

$$
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Match the correct row from the options

Combining the two classifications:

• Type of Chemical Reaction: Combustion
• Classification: Exothermic

This corresponds to the third row in the table.

Answer:

• Row 1: Corrosion, Exothermic
• Row 2: Corrosion, Endothermic
• Row 3: Combustion, Exothermic (Correct answer)
• Row 4: Combustion, Endothermic