Aulani has an upset stomach. She places a chalky tablet of medicine in a glass of water. Then, she notices that the tablet is producing bubbles in the water.

Question

What type of change is happening, and what evidence shows this?

Responses

chemical, there is a formation of a solid
chemical, there is a formation of a solid

chemical, there is a generation of a new gas
chemical, there is a generation of a new gas

physical, the water becomes solid
physical, the water becomes solid

physical, a precipitate is formed
physical, a precipitate is formed

Answer 1

The correct response is:

chemical, there is a generation of a new gas.

The evidence for this is the formation of bubbles in the water, which indicates that a gas is being produced as a result of the chemical reaction between the tablet and the water.