Question

A metal is treated with dilute hydrochloric acid in a test tube. A burning match stick is brought near the mouth of the test tube, but no sound is heard.

Answer 1

Answer:

those are reactions

Explanation:

some produce sound and some does nót produce sound

Answer 2

Answer :

A pop sound is heard when a lighted matchstick is brought near the mouth of a jar. This indicates the release of hydrogen gas.