Question

Select the following that make an example of a chemical change:
A. Water in a swimming pool evaporates in the summer
B. Rust forms on an old tool left outside
C. Pure sodium metal is easy to cut with a knife
D. Powders react to heat a hand-warmer pocket
E. Alka-Seltzer Tablets make gas bubbles when they mix with water
F. Food scraps decompose into fertilizer
G. Water vapor cools into water droplets on grass in the morning

Answer 1

B. Rust forms on an old tool left outside
E. Alka-Seltzer Tablets make gas bubbles when they mix with water
F. Food scraps decompose into fertilizer