When two substances are combined in a test tube, there may or may not be a chemical reaction....

Question:

When two substances are combined in a test tube, there may or may not be a chemical reaction. Give three pieces of evidence that would indicate the presence of a chemical reaction.

Evidence of a Chemical Change:

Materials can undergo physical or chemical change. If a chemical change takes place, the chemical identity and compposition of the matter changes. When two substances are combined in a test tube the change still can either be physical or chemical. There are simple observational pieces of evidence to indicate if a chemical reaction has occurred.

Answer and Explanation: 1

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Some observations that can be considered as the evidence of a chemical reaction in a test tube when two substances are combined are as follows:

- Gas...

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Chemical Change: Signs & Evidence

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Chapter 10 / Lesson 20
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Learn what chemical changes are and see the evidence and signs of chemical changes, as well as how they can serve as indicators of a chemical reaction.


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