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Hobbs

[Chemistry] What are two signs that can sometimes indicate a chemical reaction?

In Chemistry, what are two signs that can sometimes indicate a chemical reaction?
Answer this question
Gemz Star!:

A change in temperature or color or volume...

Hobbs:

Do you know the difference between:
In Chemistry, what are two signs that can sometimes indicate a chemical reaction?
In Chemistry, what are two signs that can always indicate a chemical reaction?

.:

this answer is correct. while both examples are indicative of chemical reactions, neither are proof of a reaction. perhaps you should take a moment and think how something can get warmer and have no chemical change, ditto with color.

to make your life easier, ceramic will warm without changing, and a color crayon on a piece of glass will affect no reactions...

BMC:

best answer, you used "sometimes". Also a change in physical state, add two liquids if they become a gas or a solid you have a reaction. Color is almost always a positive indicator as is volume, think of creating nylon.

FitInRight:

Positive and negative...Yin and Yang.
Sometimes they can be combustible. :)

Hobbs:

I'm talking about chemistry.

FitInRight:

Me too.
I guess it depends on your version of "chemistry" ;)

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