Which scenarios are definite signs that a chemical reaction has occurred? (Select all that apply)...

Question:

Which scenarios are definite signs that a chemical reaction has occurred? (Select all that apply)

a. Water is heated and releases a gas.

b. Blue and yellow paint mix to make green paint.

c. A piece of iron begins to rust.

d. Two liquids are mixed together and release a light.

What is a Chemical Reaction?:

A chemical reaction is characterized by a change in composition of reacting components while a physical change has just a difference in the smell,color or appearance of a substance without a change in internal composition.

Answer and Explanation: 1

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{eq}a){/eq} Here water is just boiled to form steam which has just a change in temperature while internally it is still the same , i.e, ...

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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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