Question

1. observe the combustion of a candle. identify each substance in the table below as a reactant or product. justify your claim with experimental evidence. substance reactant or product? evidence co₂ a b o₂ c d h₂o e f submit answer 0 / ∞ submissions used score: 0/1

Explanation:

• For $\ce{CO_2}$: Candle combustion produces $\ce{CO_2}$. We can test it with limewater (turns cloudy) or a $\ce{CO_2}$ sensor. So it's a product.
• For $\ce{O_2}$: Combustion requires $\ce{O_2}$ (from air), so it's a reactant.
• For $\ce{H_2O}$: Candle wax has H, so combustion makes $\ce{H_2O}$ (seen as condensation on a cool surface). So it's a product.

Answer:

• $\ce{CO_2}$: A. Product; B. Turns limewater cloudy (or other $\ce{CO_2}$ detection evidence)
• $\ce{O_2}$: C. Reactant; D. Used up in combustion (air is needed for flame)
• $\ce{H_2O}$: E. Product; F. Condensation on cool glass above flame