Question

select the correct answer.
what type of reaction does this chemical equation represent?
ch₄ + 2o₂ → co₂ + 2h₂o + energy

a. decomposition
b. endothermic
c. exothermic
d. synthesis

Explanation:

1. Analyze each option:

• Option A (decomposition): Decomposition reactions involve a single compound breaking down into simpler substances. Here, \( \text{CH}_4 \) and \( \text{O}_2 \) react, not a single compound decomposing, so A is incorrect.
• Option B (endothermic): Endothermic reactions absorb energy. The equation shows energy being released (as a product), so B is incorrect.
• Option C (exothermic): Exothermic reactions release energy. The equation has energy as a product, indicating energy is released, so this matches.
• Option D (synthesis): Synthesis reactions combine substances to form a single product. Here, multiple products (\( \text{CO}_2 \), \( \text{H}_2\text{O} \), energy) are formed, so D is incorrect.

Answer:

C. exothermic