Question

1. which of the following is not evidence of a chemical reaction?

a) bubbles given off

b) precipitate forming

c) light/heat

d) change in shape

Explanation:

Identify indicators of chemical reactions

• Bubbles given off (gas production) indicates a chemical change.
• Precipitate forming (insoluble solid formation) indicates a chemical change.
• Light/heat (energy release or absorption) indicates a chemical change.

Identify physical changes

• Change in shape is a physical alteration of the substance's form, not its chemical identity.

Answer:

• A) bubbles given off
• B) precipitate forming
• C) light/heat
• D) change in shape (Correct answer)