Download Study guide answers ch 5

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Chapter 5 Study Guide:
Define:
Thermal Energy:
Compare and contrast thermal contraction
and thermal expansion
Temperature:
Thermal Contraction is when molecules
come together= a substance cools.
Heat:
Thermal Expansion is when molecules spread
apart= a substance is heated
Kinetic Energy:
Potential Energy:
Conduction:
Convection:
Radiation:
Are 0 degrees Kelvin
and 0 degrees
Celsius the same?
Explain.
No. They are two
different
temperature scales
and are two
different
temperatures. At 0
degrees Kelvin all
molecular motion
stops.
Describe how
radiation from the
sun heats the Earth.
Radiation from the
sun heats the Earth
by electromagnetic
waves. Thermal
energy from the Sun
heats the equator
and the area around
the equator causing
convection currents
that heat the air.
How are these terms different? Conductor
and Insulator
A conductor will conduct thermal energy
easily and an insulator will not allow thermal
energy to pass through easily.
Draw a diagram illustrating conduction,
convection and radiation. Label and define
each word.
See diagrams from class lesson on Heat
Transfer. The video clip we watched in
class. There is also a link to the video clip on
page 172 of your text.
What is convection current? How does
heating a gas change the density of the gas?
Convection currents= are movement of
fluids (liquid or gas) through currents
because of convection. As a gas heats the
molecules move apart and become less
dense, when they are cooled they begin to
contract becoming more dense.
What happens when two containers at the same temperature are brought together?
Explain.
They will eventually even out in temperature. Heat will move from hot to cold.
Compare and contrast kinetic energy and potential energy.
Kinetic energy is energy of motion and potential energy is stored energy. They convert
back and forth due to the law of conservation of energy.
What is heat? Give an example of how heat moves.
Heat is the transfer of thermal energy from hot to cold.
What is the lowest possible
temperature? Why?
0 degrees Kelvin; all motion stops.
Why would a metal spoon feel colder than a wooden
spoon even though they are the same temperature?
A metal spoon is a good conductor (electrons move
easily) and a wooden spoon is a poor conductor (the
electrons do not move easily) of heat.
Are heat and temperature the same? Explain
HEAT AND TEMPERATURE ARE REALTED BUT NOT THE SAME!!!! Heat is the
movement of thermal energy from hot to cold and temperature is a measure of theremal
energy.
What is the relationship between thermal energy and temperature during a change of
state?
During a phase change temperature will stay the same but thermal energy will continue to
increase. Remember the graph from the ice melt lab!!!
Chapter test next class!!!!!
STUDY STUDY STUDY STUDY!!!!!!!!!