Question

which diagram represents a chemical reaction used to identify a mineral?

Explanation:

A chemical reaction involves a change in the chemical composition of a substance. In the given diagrams:

• Diagram (1) shows an acid drop being added to a mineral block, resulting in bubbling. Bubbling indicates the release of a gas, which is a sign of a chemical reaction.
• Diagram (2) shows a mineral in water, which is a physical process (dissolving, if any) rather than a chemical reaction.
• Diagram (3) shows hitting a mineral with a hammer, which is a physical change (breaking into pieces).
• Diagram (4) shows rubbing a mineral on glass to scratch, which is a test for hardness (a physical property).

Answer:

(1)