Answers25-26 CHEMISTRY IN THE EARTH SYSTEM S1Temperature and Heat

Changes of State Answers

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1
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Which feature of a heating curve indicates a change of state?

A
an upward sloping line
B
a downward sloping line
C
a horizontal line
D
a curved line
2
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Latent heat of fusion refers to which changes of state?

A
liquid to solid or solid to gas
B
solid to gas or gas to liquid
C
solid to liquid or liquid to solid
D
gas to liquid or liquid to gas
3

How much heat is released when 25.0 grams of liquid copper at its freezing point of 1,085°C changes to solid? The latent heat of fusion of copper is 205.0 J/g.

A
–27,130 J
B
–5,130 J
C
5,130 J
D
27,130 J
4

Sunidhi made a study chart about changes in states of matter.

Question illustration
A
X: Solid Directly to LiquidY: Liquid Directly to Solid
B
X: Liquid Directly to SolidY: Solid Directly to Liquid
C
X: Heat Is ReleasedY: Heat Is Absorbed
D
X: Heat Is AbsorbedY: Heat Is Released
5

Sara places a cold bottle of water in the sun. After several minutes, she notices that water droplets are collecting on the outside of the bottle.

A
sublimation
B
vaporization
C
condensation
D
deposition
6

How much heat is released when 12.0 grams of helium gas condense at 2.17 K? The latent heat of vaporization of helium is 21 J/g.

A
–250 J
B
–26 J
C
26 J
D
250 J
7

Latent heat of vaporization refers to which changes of state?

A
liquid to gas or gas to liquid
B
solid to gas or gas to solid
C
solid to liquid or gas to liquid
D
gas to liquid or liquid to solid
8

Andre heated several solid crystals of a substance called iodine, and the iodine changed directly to a gas. The iodine gas then cooled and changed into droplets.

A
condensation, then vaporization
B
sublimation, then condensation
C
deposition, then sublimation
D
vaporization, then deposition
9

In the formulas for latent heat of fusion and latent heat of vaporization, what does Q represent?

A
the amount of heat released or absorbed by a substance
B
the mass of a substance
C
the amount of a substance that changes state
D
the temperature of a substance
10

Which best compares freezing and condensation?

A
Both involve changes between liquids and gases.
B
Both involve changes between gases and solids.
C
Both involve the release of heat.
D
Both involve the absorption of heat.

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