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9 Terms

1
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What is an atom?

Basic building block of matter.

2
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What defines an element?

Atoms with the same number of protons.

3
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What is a compound?

Elements chemically bonded together.

4
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What is a molecule?

A molecule is a group of two or more atoms chemically bonded together.

5
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6
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What is a chemical reaction?

Rearrangement of atoms to form new substances.

7
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What are acids?

Produce H+ ions, pH less than 7.

8
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What are bases?

Produce OH- ions, pH greater than 7.

9
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What does the pH scale measure?

Acidity or basicity from 0 to 14.