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Temperature Scales
Absolute Zero
Phases of Matter
Melting, Freezing, Boiling
Heat
100
At what temperature does water freeze on the Fahrenheit scale?
Water freezes at 32 degrees F.
100
Is it possible to have a temperature lower than absolute zero?
No.
100
Define a solid.
A solid holds its shape and does not flow.
100
Define “melting point.”
The temperature at which melting or freezing occurs.
100
Define “heat.”
Heat is thermal energy that is capable of moving.
200
At what temperature does water boil on the Fahrenheit scale?
Water boils at 212 degrees F.
200
Define absolute zero.
The lowest possible temperature – thermal energy is as close to zero as it can be (atoms almost cannot “jiggle” at all”)
200
Define a liquid.
A liquid holds its volume but not its shape. Liquids flow.
200
Define “boiling point.”
The temperature at which boiling or condensation occurs.
200
What is heat conduction?
The transfer of heat by the direct contact of particles of matter (by touch)
300
What are the freezing point and the boiling point of water on the Celsius scale?
Water freezes at 0 degrees C and boils at 100 degrees C.
300
What is the Kelvin scale?
A temperature scale that starts at absolute zero and has units the same as Celsius degrees.
300
How is a gas similar to a liquid, and how is it different?
A gas flows like a liquid but unlike a liquid it can expand or contract to fill a container.
300
Explain the difference between boiling and condensation.
Boiling is when a material changes from a liquid into a gas. Condensation is when a material changes from a gas to a liquid.
300
Heat flows naturally from where to where?
Heat flows naturally from a warmer object to a cooler one.
400
Is a degree Fahrenheit the same size as a degree Celsius? Explain.
No. There are 180 degrees between freezing and boiling (32 and 212) on the Fahrenheit scale. There are 100 degrees between freezing and boiling on the Celsius Scale.
400
Why is having a temperature scale that starts at absolute zero useful to scientists?
Most of the outer planets and moons have temperatures closer to absolute zero than to the freezing point of water.
400
What holds the molecules in a material together?
Intermolecular forces.
400
What happens to water at 0 degrees C?
At 0 degrees C liquid water begins to freeze and ice begins to melt.
400
Insulators do a good job of what?
Keeping heat energy from escaping.
500
What does temperature measure?
Temperature measures the kinetic energy per atom due to random motion.
500
What is the hottest possible temperature on the Kelvin scale?
There is no hottest possible temperature (there is no upper limit on any temperature scale).
500
Explain the difference in density between the solid form a material and the gas form.
A solid is more dense than the same material as a gas, because there are more atoms packed together in the same amount of space.
500
Our experiment with ice, wax and chocolate showed that:
Water, wax and chocolate have different freezing/melting points
500
What are the three ways heat can move? Give an example of each.
1. Conduction - heat moving by touch - holding ice in your hand. 2. Convection - heat rising and falling in fluids - warm air rising, lava rising 3. thermal radiation - heat moving as rays - sunlight coming through a window