Question

value: 3 a ___ reaction occurs when the reactant(s) combine with oxygen, releasing light and heat.

a. decomposition

b. acid - base

c. combustion

d. displacement

Explanation:

To solve this, we analyze each option:

• Option a: Decomposition reactions involve breaking down a compound into simpler substances, not combining with oxygen.
• Option b: Acid - base reactions involve the transfer of protons (H⁺ ions) between acids and bases, no oxygen combination for light/heat release.
• Option c: Combustion reactions are defined as reactions where reactants combine with oxygen, and they release light and heat (e.g., burning of fuels like methane: $CH_4 + 2O_2

ightarrow CO_2 + 2H_2O$ with energy release).

• Option d: Displacement reactions involve one element replacing another in a compound, not related to combining with oxygen for light/heat release.

Answer:

c. combustion