Heat

Question 1

For each example of a phase change, identify whether heat is absorbed from the surroundings or released into the surroundings.A popsicle melts on a hot day.

Revolt · Accepted Answer

heat absorbed

Question 2

Rubbing alcohol evaporates from the surface of the skin.

Revolt · Accepted Answer

heat absorbed

Question 3

Lava solidifies when it erupts from a volcano.

Revolt · Accepted Answer

heat released

Question 4

A scientist needs to calculate the amount of heat released when a sample of melted iron freezes. Which constant should be used?

Revolt · Accepted Answer

–DHfus

Question 5

kcal

Revolt · Accepted Answer

2.06

Question 6

Which of the following is true of the relationships between heat of fusion and heat of vaporization?

Revolt · Accepted Answer

The heat of vaporization is typically larger than the heat of fusion.

Question 7

Sweat on the surface of skin works as a cooling system because

Revolt · Accepted Answer

the liquid water absorbs heat from the skin surface and is transferred to the air when the water evaporates.

Question 8

Which of the following correctly describes how to break this calculation into steps?

Revolt · Accepted Answer

Cool liquid from 314 K to 273 K, freeze liquid at 273 K, and cool solid to 263 K.

Heat Answers

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