PS Ch 7 Test Review

Chemical equations are used to describe __________________.

• changes in state

• chemical changes

• chemical properties

• physical changes

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Magnetism is a physical property that could be used to separate a mixture of _________.

• sugar and salt

• salt and water

• iron filings and sand

• sand and water

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Color change, odor change, and bubbles are signs that a(n) ________ might have occurred.

• energy change

• physical change

• chemical change

• none of the above

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The chemical equation for the reaction that occurs when propane gas burns is shown below. What are the products of this reaction? C₃H₈ + 5O₂ ---> 3CO₂ + 4H₂O

• C₃H₈ and 5O₂

• 5O₂ and 3CO₂

• 4H₂O and C₃H₈

• 3CO₂ and 4H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which physical property would be most useful for separating the substances in a saltwater solution?

• mass

• density

• magnetism

• boiling point

A change in __________ is a sign that a chemical change might have occurred.

• size

• state

• smell

• shape

Tags

NGSS.MS-PS1-2

Which activity could be a sign that a chemical change has occurred?

• a solid melts

• a substance dissolves

• a liquid changes color

• an object changes shape

Tags

NGSS.MS-PS1-2

Which item is a substance?

• aluminium

• apple juice

• muddy water

• saltwater

The number of protons in an atom of an element is the element’s _________.

• atomic mass

• atomic number

• element symbol

• atomic weight

H₂O is an example of ________________.

• an atomic number

• an element symbol

• a chemical formula

• an element weight