Molecules and Compounds

These are what form chemical bonds as atoms share or take them from one another.

• electrons

• electron clouds

• protons

• neutrons

Carbon (C) and hydrogen (H) are pure substances. Each is made of only one type of atom, but carbon atoms are different from hydrogen atoms. Carbon and hydrogen chemically combine to form methane (CH4).

• methane is an element and carbon and hydrogen are compounds.

• carbon, hydrogen, and methane are all elements.

• carbon, hydrogen, and methane are all compounds.

• carbon and hydrogen are elements and methane is a compound.

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NGSS.MS-PS1-1

A compound is...

• a substance made up of one type of atom in its molecular form.

• a substance formed by the reaction of two or more elements.

• a mixture formed by the mixing of two or more elements.

• a substance made up of one type of atom in its atomic form.

How many different elements are represented in the compound?
H₂O₂

• 2

• 3

• 1

• 4

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NGSS.MS-PS1-1

How many different elements are represented in the compound?
Fe₃O₄

• 2

• 3

• 1

• 4

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NGSS.MS-PS1-1

How many atoms are represented in the compound?

CH₄

• 2

• 3

• 4

• 5

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NGSS.MS-PS1-1

True or False? These are all compound molecules.

• True

• False

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NGSS.MS-PS1-1

How many elements are in this molecule? C_6H_{12}O_6

• 3

• 24

• 12

• 18

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NGSS.MS-PS1-1

What is the picture displaying?

• An element

• An atom

• A compound

• A nucleus

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NGSS.MS-PS1-1

Which of these is a compound?

• Iron

• Potassium

• Salt

• Calcium

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NGSS.MS-PS1-1