A gas and a metal are put into the same container. These substances react with a burst of heat (in the form of light), forming a white powder.

Question

What most likely happened during this change?

Select all that apply.

Responses

There was a physical change only since a solid formed from a gas.
There was a physical change only since a solid formed from a gas.

The two substances chemically reacted to form new substances.
The two substances chemically reacted to form new substances.

There was a temperature increase during this change.
There was a temperature increase during this change.

The two substances did not chemically react but instead mixed evenly.

Answer 1

Based on the description of the scenario, the following responses are most likely applicable:

1. The two substances chemically reacted to form new substances.

   • This is supported by the information that a reaction occurred with a burst of heat (in the form of light) and resulted in the formation of a new substance (the white powder).

2. There was a temperature increase during this change.

   • This is also supported by the details provided, as it mentions a burst of heat indicating an exothermic reaction.

Therefore, the correct responses would be:

• The two substances chemically reacted to form new substances.
• There was a temperature increase during this change.

The other options do not accurately describe what happened during the reaction.