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Unit 3 Part B
Test Description: Heat transfer and specific heat capacity, phase changes
Instructions: Answer all questions to get your test result.
1) Which statement best describes the molecular motion of the water molecules as a stove top supplies heat?
A
The molecular motion will increase as more thermal energy is absorbed
B
The molecular motion will decrease as less thermal energy is absorbed
C
The molecular motion will increase as less thermal energy is absorbed
D
The molecular motion will decrease as more thermal energy is absorbed
2) During an experiment, black pepper was added to water as it boiled strongly, and the pepper moved in a circular pattern from the top of the water to the bottom and back again. What does the circular pattern of the pepper represent?
A
The radiation of thermal energy being passed from the Sun to the water
B
The evaporation of the water due to the conduction of thermal energy
C
The pressure of the water pushing particulates to the bottom of the beaker
D
The convection of water currents as warm water rises and cool water sinks
3) One end of an iron rod is held over a candle flame. On the other end of the rod, a blob of wax starts to melt. Why is this occurring?
A
The particles in the rod move faster when heated, which causes the wax to get hot and melt
B
The particles in the rod move toward the candle, which causes the wax to get hot and melt
C
The particles in the rod move slower when heated, and this rigid structure causes the wax to melt
D
The particles in the rod move away from the candle, which causes the wax to get heated and melt
4) A cup of hot chocolate has a spoon in it. How does the heat move from the hot chocolate to the metal spoon handle?
A
It moves through conduction, because heat is transferred by density differences
B
It moves through convection, because heat is transferred by density differences.
C
It moves through convection, because heat is transferred directly from the hot chocolate to the spoon
D
It moves through conduction, because heat is transferred directly from the hot chocolate to the spoon.
5) Henrietta wants to choose a metal that has the best rate of heat conduction so she can use it to make a new frying pan. Which metal is the best choice?
A
Aluminum (specific heat 0.9 J/gC)
B
Copper (specific heat 0.385 J/gC)
C
Nickel (specific heat 0.440 J/gC)
D
Iron (specific heat 0.444 J/gC)
6) Jose wants to keep a container of juice cold for a long time. Which material would be his best choice?
A
Iron (specific heat 0.56 J/gC)
B
Aluminum (specific heat 0.9 J/gC)
C
Porcelain (specific heat 1.07 J/gC)
D
Copper (specific heat 0.385 J/gC)
7) What is happening when a substance is boiling?
A
An increase in energy absorption and a phase change
B
A decrease in energy absorption and no phase change
C
No change in energy absorption and a phase change
D
No change in energy absorption and no phase change
8) What state of matter is water in at 1 C?
A
plasma
B
solid
C
liquid
D
gas
9) What happens to water at 0 C?
A
Liquid water is being converted from a liquid to a gas by absorbing heat energy from the surroundings
B
Liquid water is becoming warmer as it absorbs heat energy from the surroundings
C
Solid water is becoming warmer as it absorbs heat energy from the surroundings
D
Solid water is being converted from a solid to a liquid by absorbing heat energy from the surroundings
10) A gram of water boiled for approximately 3 times as long as a gram of acetic acid. Which statement best explains this?
A
Water has a higher specific heat and so required more energy to change its phase
B
Water has a lower specific heat and so took longer to change its phase
C
Acetic acid has a higher specific heat and so required more energy to change its phase
D
Acetic acid has a lower specific heat and so took longer to change its phase
*select an answer for all questions
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