Chemistry Review

The smallest unit of matter is called a(n)

• atom

• element

• molecule

• compound

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What are the tiny particles that make up the atom?

• protons and neutrons

• neutrons and electrons

• positives, negatives, and electrons
• protons, neutrons, and electrons

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Atoms of one kind make up ___, and cannot be broken down by chemical reactions.

• elements

• compounds

• molecules

• neutrons

___ are made up of 2 or more different elements that are chemically bonded together.

• compounds

• molecules

• atoms

• neutrons

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___ are made up of 2 or more elements that are chemically bonded together. The elements can be either the same kind or different kinds.

• compounds

• molecules

• atoms

• neutrons

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Which of the following represents an element?

• H₂O
• H₂
• NaCl
• CaCO₃

An element is made up of only one kind of ___.

• proton

• compound

• atom
• neutron

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How many hydrogen atoms are in 4H₂O?

• 6
• 8
• 2
• 4

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How many elements are in C₆H₁₂O₆?

• 1
• 2
• 3
• 4

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How many sodium atoms are in 6NaCl?

• 1

• 12
• 6
• 2

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