Question
When a strip of zinc metal is added to a test tube of hydrochloric acid, the liquid forms bubbles, and the test tube feels hot. The bubbles are a result of the formation of hydrogen gas. What does the hot test tube indicate?
A.
The reaction absorbs heat.
B.
The reaction releases heat.
C.
A chemical change has been reversed.
D.
Hydrogen gas absorbs heat.
A.
The reaction absorbs heat.
B.
The reaction releases heat.
C.
A chemical change has been reversed.
D.
Hydrogen gas absorbs heat.
Answers
GPT-4o mini
The hot test tube indicates that the reaction releases heat. Therefore, the correct answer is:
**B. The reaction releases heat.**
This is an exothermic reaction where the formation of hydrogen gas from the zinc and hydrochloric acid releases energy, resulting in an increase in temperature of the test tube.
**B. The reaction releases heat.**
This is an exothermic reaction where the formation of hydrogen gas from the zinc and hydrochloric acid releases energy, resulting in an increase in temperature of the test tube.