Question

One situation indicates a physical change rather than a chemical change. Which situation indicates a physical change?

A) Solid copper melts to form liquid copper.
B) A firecracker explodes on the fourth of July.
C) Water reacts with the iron on your bicycle to form rust.
D) Magnesium metal is mixed with hydrochloric acid and hydrogen gas is formed. Eliminate

Answer 1

Solid copper melts to form liquid copper,

Step-by-step explanation:

In a chemical change, something new is being formed. When copper melts, or any phase change occurs, nothing new is formed chemically, so this would be a physical change.

Answer 2

The physical change would be A. Solid copper melting to form liquid copper. The rest are all examples of chemical change.