Jasmin has two gases in separate containers. One gas is colorless, while the other is brown. She connects the containers and allows the gases to mix.

Question

What change indicates that the gases are chemically reacting?

Select all that apply.

Responses

The gases move over time and mix.
The gases move over time and mix.

The gases stay in their separate containers and do not mix.
The gases stay in their separate containers and do not mix.

The temperature of the container decreases.
The temperature of the container decreases.

The gas mixture becomes blue over time.

Answer 1

The changes that would indicate the gases are chemically reacting would be:

• The temperature of the container decreases.
• The gas mixture becomes blue over time.

These indicate a chemical change due to the formation of products with different properties from the reactants. The mixing of gases alone does not indicate a chemical reaction; it may simply mean they are physically mixing without any chemical change occurring.