7th Grade Chemistry Unit Test

Which model (s) show represent an element?

• A

• B

• C

• D

• E

Tags

NGSS.MS-PS1-1

Which model (s) show represent a compound?

• A

• B

• C

• D

• E

Tags

NGSS.MS-PS1-1

Which model (s) show represent a mixture?

• A

• B

• C

• D

• E

If you see the symbol He, the type of substance you are working with is a ______________.

• Element

• Compound

• Mixture

If you see the symbol H₂O, the type of substance you are working with is a ______________.

• Element

• Compound

• Mixture

Tags

NGSS.MS-PS1-1

This model represents a(n)

• atom

• bond

• mixture

• molecule

Tags

NGSS.MS-PS1-1

In this model, what does each sphere represent?

• atom

• bond

• mixture

• molecule

Tags

NGSS.MS-PS1-1

In this model, what does each stick represent?

• atom

• bond

• mixture

• molecule

Tags

NGSS.MS-PS1-1

A substance has a mass of 18g and a volume of 2cm³. What is the density of the substance?

• 9 g/cm³

• 20 g/cm³

• 16 g/cm³

• 36 g/cm³

Sample A has a mass of 20 g and volume of 5 g/cm3. Sample B has a mass of 16 g and a volume of 4 g/cm3. Are the two samples the same substance?

• They are not the same substance because they have different substances.

• They are not the same substance because they have different volumes

• They are the same substance because they have the same density.

• They are the same substance because they have the same volume.