Science 101: Why does a color change indicate a chemical change? | NSTA

Science 101: Why does a color change indicate a chemical change?

Science and Children -- February 2006

There are a a number of indicators you can use to determine whether or not a chemical reaction has occurred. Among them are a change in color, the evolution of a gas, and the production or absorption of heat. To understand why any of these indicators work you must understand what is meant by a chemical reaction.

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