Question

When zinc is placed in hydrochloric acid, a gas is produced. When the gas is collected in a tube and a lit match is placed in the tube, a pop is heard. This is a test for hydrogen gas. What can be concluded from this observations. A) A change in state has occurred. B) The zinc metal was turned into hydrogen gas. C) A chemical change has occurred producing the hydrogen gas. D) A physical change has occurred producing the hydrogen gas.

Answer 1

a chemical change occurred producing hydrogen gas C

Answer 2

Answer: Option (C) is the correct answer.

Explanation:

A change which causes a difference in chemical composition of a substance is known as a chemical change.

For example, $Zn + 2HCl \rightarrow ZnCl_{2} + H_{2}$

As zinc and hydrochloric acid are chemically combining with each other. And, during this reaction hydrogen gas is released due to change in chemical composition of the reactant species.

Thus, we can conclude that in the given situation it is observed that a chemical change has occurred producing the hydrogen gas.