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Grade 7 Science · Problem type

Element or compound?

Use this for “Which of these substances is an element?”

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Element or compound?
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Assumptions

•
An element is one kind of atom, alone or joined to itself.
•
A compound is different kinds of atoms joined in a fixed pattern.
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Counting atoms in water molecules
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Pure substance or mixture?
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Modeling matter: particles too small to see

Related lessons

Atoms, elements and molecules
Main lesson
Counting atoms in water molecules
Use this for “What atoms make up a molecule of water?” and “How many atoms are in 6 water molecules?”
Pure substance or mixture?
Use this for “Which of these is a mixture?”
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