AnswersCrowley Credit Recovery Physics AConservation of Energy

Lesson 3: Temperature and Heat Answers

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1
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Which best describes the difference between internal and thermal energy?

A
Internal energy is the total potential energy in a substance, and thermal energy is the total kinetic energy in a substance.
B
Thermal energy is the total potential energy in a substance, and internal energy is the total kinetic energy in a substance.
C
Internal energy is the total potential and kinetic energies in a substance, and thermal energy is the part of internal energy that can be transferred to another substance.
D
Thermal energy is the total potential and kinetic energies in a substance, and internal energy is the part of internal energy that can be transferred to another substance.
2
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Sample Response: Heat is thermal energy that flows from a warmer substance to a cooler substance. Thermal energy is the part of internal energy that can be transferred. Which did you include in your response? Check all that apply.Thermal energy is the part of internal energy that can be transferred from one substance to another.Heat is thermal energy that flows from a warmer substance to a cooler substance.

A
Thermal energy is the part of internal energy that can be transferred from one substance to another.
B
Heat is thermal energy that flows from a warmer substance to a cooler substance.
3

What is the difference between thermal energy and heat?

Answer:

Thermal energy is the total internal energy of a substance due to the kinetic energy of its molecules. Heat is the transfer of that thermal energy from a substance at a higher temperature to a substance at a lower temperature.

4

List these drinks in order of kinetic energy, starting with the drink whose particles have the highest kinetic energy.

A
hot chocolate, water, juice, milk
B
hot chocolate, juice, milk, water
C
water, milk, juice, hot chocolate
D
water, hot chocolate, juice, milk
5

How much heat is needed to change the temperature of 3 grams of gold (c = 0.129 ) from 21°C to 363°C? The answer is expressed to the nearest whole number.

Question illustration
A
121 joules
B
132 joules
C
140 joules
D
149 joules
6

Zoe has 25 grams of water (c = 4.186 ) at 10°C, which she mixes with 12 grams of water at 30°C. Assume that no heat is lost to the surroundings.What is the final temperature of the two liquids? The answer is expressed to the nearest whole number.

Question illustration
A
–47°C
B
–8°C
C
3°C
D
16°C

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Lesson 3: Temperature and Heat Answers — Crowley…