Question

1. c(s) + o₂(g) → co₂(g)

what type of reaction is #1?
decomposition
combustion
double replacement
synthesis

Explanation:

Combustion reactions involve a substance reacting with oxygen to produce carbon dioxide (and often water). The given reaction \( C(s)+O_{2}(g)\to CO_{2}(g) \) fits this definition as carbon (\( C \)) reacts with oxygen (\( O_{2} \)) to form carbon dioxide (\( CO_{2} \)). Synthesis reactions involve combining two or more reactants to form one product, but combustion is a specific type where oxygen is a reactant and heat is often released. Decomposition is breaking a compound into simpler substances. Double replacement involves two compounds exchanging ions.

Answer:

combustion