Molecules and Compounds

The tiniest bit of water that still is water is a molecule of water.

• True

• False

Tags

NGSS.MS-PS1-1

An oxygen molecule usually has two oxygen atoms.

• True
• False

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NGSS.MS-PS1-1

Carbon dioxide is a compound.

• True

• False

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NGSS.MS-PS1-1

Two or more atoms joined together make up a _____.

• compound

• molecule

• solution

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NGSS.MS-PS1-1

A substance that is made up of atoms of more than one element is a _______. 

• compound
• rust
• molecule

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NGSS.MS-PS1-1

The center of an atom is the _____.

• electron
• nucleus
• neutron

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NGSS.MS-PS1-1

In an expression H₂O the "2" represents ____.

• 2 atoms of hydrogen

• 2 atoms of oxygen

• 2 molecules of water

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NGSS.MS-PS1-1

Matter has mass and takes up ____.

• mixture
• compound
• space

This tells you how many protons are in each atom of a specific element and how many electrons there are in each unreacted atom from that element.

• atomic number

• atomic mass

• chemical formula

• chemical symbol

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NGSS.MS-PS1-1

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.

Tags

NGSS.MS-PS1-1