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
o₂	c	d
h₂o	e	f

Explanation:

When a candle burns, it reacts with oxygen ($O_2$) in the air. The wax (a hydrocarbon) combines with oxygen to produce carbon - dioxide ($CO_2$) and water ($H_2O$). We can test for $CO_2$ using lime - water which turns milky when $CO_2$ is passed through it. We can observe water vapor condensing on a cold surface placed near the burning candle. Oxygen is consumed during the combustion process as the flame goes out in a closed container due to lack of oxygen.

Answer:

A. Product
B. Lime - water turns milky when exposed to gas from burning candle.
C. Reactant
D. Flame goes out in a closed container due to oxygen consumption.
E. Product
F. Water vapor condenses on a cold surface near the burning candle.