AnswersPhysical ScienceSolutions and Other Mixtures

Practice Test Answers

7 verified answers
1
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Which describes how a centrifuge separates a mixture?

A
It heats a sample to separate based on density.
B
It heats a sample to separate based on boiling point.
C
It spins a sample to separate based on boiling point.
D
It spins a sample to separate based on density.
2
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Which explains why mixtures can be separated?

A
The components have different properties.
B
The components have the same properties.
C
The components are always made of large particles.
D
The components are always made of small particles.
3

A student is trying to determine if a solution is acidic or basic. She does not have any litmus paper. Which would she most likely use to get a reading on her solution?

A
soap
B
vinegar
C
aquarium water
D
cabbage juice
4

Which jar contains a mixture?

A
a jar of liquid copper
B
a jar of solid carbon
C
a jar of copper and water
D
a jar of carbon dioxide gas
5

Helen needs to make a supersaturated solution of saltwater. Which describes the best way to make the solution?

A
decrease the pressure and add more salt
B
increase the temperature of the solution and add more salt
C
decrease the temperature of the solution and add less salt
D
increase the pressure and add less salt
6

Which separation procedure is most likely to happen?

A
Filtering a mixture will separate it into substances.
B
Melting an element will break it down into compounds.
C
Boiling a pure substance will separate it into mixtures.
D
Freezing a compound will break it down into elements.
7

Which solution has the greatest number of hydrogen ions?

A
blood, pH is equal to 7 point 2
B
soda, pH is equal to 3 point 5
C
lemon juice, pH is equal to 2
D
bleach, pH is equal to 13 point 5

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