Which answer choices best indicate that a substance has experienced a chemical change?

Select all that apply.
when the substance changes temperature
when the substance changes shape
when the substance changes volume
when a new substance is formed

A, B, D?

Definitely D because when you make a new substance there is a new molecular compound and it would be a chemical change. I also agree with A because temperature change to a certain degree can lead to a chemical change like denaturing enzymes. Changing shape is a physical change and does not alter your substance. Changing the volume is also negligible so I think A,D

the correct answer is when the substance changes temperature, and when a new substance is formed. I did the quiz :)

To determine which answer choices best indicate that a substance has experienced a chemical change, let's analyze each option:

1. When the substance changes temperature: This indicates a physical change, as the temperature can be altered without any changes in the substance's chemical composition. Therefore, it does not indicate a chemical change.

2. When the substance changes shape: Similar to the previous option, changing the shape of a substance is also a physical change that does not directly indicate a chemical change.

3. When the substance changes volume: Like the temperature and shape changes, altering the volume of a substance is a physical change and does not necessarily indicate a chemical change.

4. When a new substance is formed: This is the key indicator of a chemical change. If a new substance with different chemical properties is formed, it strongly suggests that a chemical reaction occurred, indicating a chemical change.

Considering the explanations provided, the answer choices that best indicate a chemical change are: "when a new substance is formed."