Chemistry 2001 JAMB Past Questions - Question 45: A burning candle produces water and

Correct Answer

B

Explanation

A burning candle primarily produces carbon dioxide (CO2), water vapor (H2O), and heat. The chemical reaction involved in the combustion of a candle can be represented by the following simplified equation:

\[\text{C}_n\text{H}_{2n+2} + (3n+1)\text{O}_2 \rightarrow (n+1)\text{CO}_2 + (n+2)\text{H}_2\text{O} + \text{heat}\]

In this equation, \( \text{C}_n\text{H}_{2n+2} \) represents the hydrocarbons present in the candle wax (such as stearin, which is a common component of candle wax). The reaction consumes oxygen (\( \text{O}_2 \)) and produces carbon dioxide (\( \text{CO}_2 \)), water (\( \text{H}_2\text{O} \)), and heat. The water produced is in the form of water vapor, which is a gaseous state.

The heat generated during the combustion process is a result of the exothermic nature of the reaction, and it contributes to the candle flame's light and warmth. Keep in mind that this is a simplified representation, and the composition of candle wax can vary, leading to additional by-products and complexities in the combustion process.