Question

According to the lab guide, which changes below will you look for in order to test the hypothesis? Check all that apply.

changes in shape or size

color changes

whether changes are easily reversible

temperature changes

formation of precipitates or gases

changes of state (gas, liquid, or solid)

Answer 1

Select:
- changes in shape or size — No
- color changes — Yes
- whether changes are easily reversible — Yes
- temperature changes — Yes
- formation of precipitates or gases — Yes
- changes of state (gas, liquid, or solid) — No

Reason: color change, temperature change, gas/precipitate formation and irreversibility are common indicators of a chemical change; shape/size and simple phase changes are usually physical.