Science Lesson 3: Physical and Chemical Changes

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6 Terms

1

physical change

A change that alters the form or appearance of a substance but does not change its chemical composition, such as melting or freezing.

2

chemical change

A change that results in the formation of new substances with different chemical properties, such as burning or rusting.

3

conservation of mass

matter is neither created nor destroyed during a physical or chemical change. Mass before change = mass after change.

4

signs that a chemical change has taken place

change in color, change in odor, change in temperature, formation of a gas, formation of a solid

5
<p>What happened that caused this apple to turn brown?</p>

What happened that caused this apple to turn brown?

A chemical reaction occurred because a change in color happened.

6

What is a physical combination of two or more substances that are blended together without forming a new substance?

mixture