AnswersGA-GSE Grade 8 Physical ScienceUnit Test

Physical Properties Answers

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Which statement about the physical change of liquid water boiling into steam is true?

A
The heat added represents an energy change.
B
The action cannot be reversed.
C
The steam cannot conserve mass.
D
The weight lost represents a mass change.
2
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What is an example of a physical change?

A
having less ash than the paper that was burned to form it
B
ice forming and then melting back into water
C
rust having a different identity than the iron it forms on
D
the irreversible reaction of vinegar and baking soda
3

If there is 8 g of a substance before a physical change, how much will there be afterwards?

A
0 g
B
4 g
C
8 g
D
16 g
4

Serena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into the liquid. What physical property of the material is Serena most likely observing?

A
solubility
B
conductivity
C
magnetism
D
density
5

Which scenario is an example of a physical change?

A
Wood is burned in a campfire and is turned into ash and smoke.
B
A piece of metal is left in the rain and forms rust.
C
Lead is melted into a liquid to form pellets.
D
Yeast turns sugar into energy, water, and carbon dioxide gas.
6

Which statement best compares and contrasts two physical properties of matter?

A
Density and solubility are similar because they both involve water, but they are different because density involves dissolving a material and solubility involves floating or sinking a material.
B
Density and solubility are similar because they both involve a material’s mass and volume, but they are different because density involves floating materials and solubility involves sinking materials.
C
Boiling points and melting points are similar because they both involve changing the heat of a material, but they are different because boiling point involves adding heat to a material and melting point involves removing heat from a material.
D
Boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid.
7

When liquid gold becomes a solid, its particles get closer together. Which best describes what happened to the gold?

A
the conservation of magnetism
B
the change in solubility in a physical change
C
the change in melting point in a physical change
D
the rearrangement of particles in a physical change
8

What happens when a substance undergoes a physical change?

A
Some physical properties change, but the substance keeps its identity.
B
No physical properties change, and the substance keeps its identity.
C
Some physical properties change, and the substance changes its identity.
D
No physical properties change, but the substance changes its identity.
9

Eugene describes the physical property of a material as “sweet and floral.” What physical property of the material is Eugene most likely observing?

A
boiling point
B
shape
C
hardness
D
odor
10

Wax melts when it is heated. Which most likely describes what is true of the result of this reaction?

A
The bonding of the atoms is not the same before and after the change.
B
The wax has the same density before and after the change.
C
The same amount of wax exists before and after the change.
D
The wax cannot be changed back into a solid.

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