Practice- 6.2.1 Atoms and Molecules

Explain the difference between an atom and a molecule.

• One molecule is made of one atom.
• One molecule is always made of different particles.
• One molecule is made of more than one atom.
• One molecule is made of more than two atoms.

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Which of the models below represent a molecule? 

• A
• B
• C
• D

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Elements are made of 

• many types of atoms 
• the periodic table
• one type of atom 
• molecules 

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All matter is made of 

• energy 
• atoms 
• electrons 
• compounds 

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How many atoms are there in a molecule?

• no atoms
• 1 or more atoms
• 2 to thousands of atoms
• exactly 18 atoms

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What is the basic unit of matter and is the smallest particle of an element?

• Atoms
• Elements
• Compounds
• Molecules

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Two or more atoms chemically bonded together are called a

• atom
• element
• molecule
• mixture

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How many hydrogen atoms are there in a water molecule? 

• 0
• 1
• 2
• 3

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What is the total number of atoms in an ammonia (NH₃) molecule?

• 1
• 2
• 3
• 4

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Carbon dioxide (CO₂) contains how many atoms of oxygen?

• 0
• 1
• 2
• 3

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