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Is color change evidence that a chemical or physical change may have occurred?

Answer 1

Definitely, but it is not a good indicator of telling you which might have occured

I would caution you against using color change as a firm identifier of either physical or chemical changes, but it is a good way to tell that a change has occurred. That's about all I have to say about that.

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 (#CuO#) 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.

In summary, color change is a great indicator that something has changed, but it doesn't tell you what kind of change might have happened. Better indicators, like the release of heat, can help you determine that.

I hope it was helpful.

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Answer 2

Cooper Adams

Indeed, a shift in color may indicate a chemical change.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.