Unit 3 Part B Question Preview (ID: 49207)
Heat Transfer And Specific Heat Capacity, Phase Changes.
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Which statement best describes the molecular motion of the water molecules as a stove top supplies heat?
a) The molecular motion will increase as less thermal energy is absorbed
b) The molecular motion will decrease as less thermal energy is absorbed
c) The molecular motion will increase as more thermal energy is absorbed
d) The molecular motion will decrease as more thermal energy is absorbed
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
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 away from the candle, which causes the wax to get heated and melt
d) The particles in the rod move slower when heated, and this rigid structure causes the wax to melt
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 convection, because heat is transferred directly from the hot chocolate to the spoon
b) It moves through conduction, because heat is transferred by density differences
c) It moves through convection, because heat is transferred by density differences.
d) It moves through conduction, because heat is transferred directly from the hot chocolate to the spoon.
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)
Jose wants to keep a container of juice cold for a long time. Which material would be his best choice?
a) Porcelain (specific heat 1.07 J/gC)
b) Copper (specific heat 0.385 J/gC)
c) Aluminum (specific heat 0.9 J/gC)
d) Iron (specific heat 0.56 J/gC)
What is happening when a substance is boiling?
a) An increase in energy absorption and a phase change
b) No change in energy absorption and no phase change
c) No change in energy absorption and a phase change
d) A decrease in energy absorption and no phase change
What state of matter is water in at 1 C?
a) solid
b) liquid
c) gas
d) plasma
What happens to water at 0 C?
a) Liquid water is becoming warmer as it absorbs heat energy from the surroundings
b) Liquid water is being converted from a liquid to a gas by absorbing 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
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) Acetic acid has a higher specific heat and so required more energy to change its phase
c) Water has a lower specific heat and so took longer to change its phase
d) Acetic acid has a lower specific heat and so took longer to change its phase
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