Question

You have a glass of liquid and combine it with a mysterious solid and notice that over time the color changes. this questions has two answers
1) give me a scenario that would explain how this coukd be a physical change
2) give me a scenario that would explain how this could be a chemical change

Answer 1

Answer:

This is a verified chemical change. On the other hand, if you add red ink to water, it will turn red. However, we would classify that as a physical change. To conclude, color change is a great indicator that change has occurred.

Explanation:

This is since there are examples of color change being an indicator for both of them. For instance, when you heat the blue copper(II) hydroxide solution, you'll eventually end up with a black copper oxide ( Cu O ) solution. This is a verified chemical change. On the other hand, if you add red ink to water, it will turn red. However, we would classify that as a physical change.

To conclude, color change is a great indicator that change has occurred. However, it does not tell you which type of change might have occurred. You will want to use better indicators - like release of heat - to guide you with that.

Hope that helped :)