Question

patterns of attraction quick check
combustion reactions release ______. (1 point)
○ oxygen and water
○ light, carbon dioxide, and water
○ light and oxygen
○ oxygen and carbon dioxide

Explanation:

Combustion reactions are exothermic reactions that involve a fuel reacting with oxygen. For example, when a hydrocarbon (like methane, \(CH_4\)) burns in oxygen (\(O_2\)), the general reaction is \(CH_4 + 2O_2
ightarrow CO_2+2H_2O\). In such reactions, light (as part of the energy release) is given off along with carbon dioxide (\(CO_2\)) and water (\(H_2O\)).

• Option 1: Oxygen is a reactant in combustion, not a product. So “oxygen and water” is incorrect.
• Option 2: In a typical combustion (e.g., of a hydrocarbon), light is released (as energy), and \(CO_2\) and \(H_2O\) are products.
• Option 3: Oxygen is a reactant, not a product. So “light and oxygen” is wrong.
• Option 4: Oxygen is a reactant, not a product. So “oxygen and carbon dioxide” is wrong.

Answer:

light, carbon dioxide, and water