Atoms, Elements & Compounds, AND Changes in Matter

What is a compound?

• an atom with more electrons than protons
• a substance in which the atoms of two or more elements are combined together
• an atom with more neutrons than protons
• a substance in which the atoms of three or more elements are combined together

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NGSS.MS-PS1-1

The same or different atoms combine to form _______. 

• electrons
• molecules
• nuclei
• neutrons

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NGSS.MS-PS1-1

Carbon dioxide is formed when two oxygen atoms chemically combine with a carbon atom. Which term best describes carbon dioxide?

• atom
• mixture
• element
• compound

Tags

NGSS.MS-PS1-1

Which of the following is the most accurate statement?

• everything is both a molecule and a compound

• nothing can be both a molecule and a compound

• all compounds are also molecules

• All molecules are also compounds

Tags

NGSS.MS-PS1-1

Oxygen, Nitrogen, Hydrogen, and Calcium are all examples of ______________________.

• molecules

• compounds

• atoms

• elements

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NGSS.MS-PS1-1

Which one of the following is a compound?

• NaCl

• O2

• H

• He2

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NGSS.MS-PS1-1

What is a substance with unique physical and chemical properties that can't be reduced by chemical means.

• an element

• an atom

• a molecule

• a compound

Which of these models can be described as a compound?

• water

• carbon dioxide

• amonia

• methane

• All of them are compounds

Tags

NGSS.MS-PS1-1

Which of these is only a molecule and not a compound?

• a

• b

• c

• d

Tags

NGSS.MS-PS1-1

This picture represents which of the following?

• Element

• Compound

• Molecule

Tags

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