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Heat Transfer

Phase Changes

Temp Scales

ΔQ

Question: The average kinetic energy of the molecules in a substance.

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Answer: Temperature

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Question: The amount of thermal energy in an object.

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Answer: Heat

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Question: The SI or metric unit for heat.

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Answer: Joules

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Question: BTUs stands for:

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Answer:

British Thermal Units

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Question: Evaporation and boiling are both types of this:

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Answer: Vaporization

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Question:

Type of heat transfer:

Burning your finger on a hot stove.

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Answer: conduction

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Question:

Type of heat transfer:

A cool breeze flows off the ocean

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Answer: Convection

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Question:

Type of heat transfer:

Energy travels from the sun to the Earth

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Answer: radiation

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Question:

Type of heat transfer:

Infrared wavelengths of energy

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Answer: radiation

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Question:

Type of heat transfer:

Only happens in fluids and can NOT occur in solids

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Answer: Convection

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Question: process of changing from solid to a liquid

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Answer: melting

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Question: process of changing from solid to a gas

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Answer: sublimation

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Question: process of changing from liquid to a gas below the boiling point

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Answer: evaporation

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Question: process of changing from gas to a liquid

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Answer: condensation

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Question: process of changing from liquid to a gas that takes place throughout the liquid

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Answer: boiling

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Question: The melting point of water on the Kelvin scale

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Answer: 273oK

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Question: The boiling point of water on the Celsius scale

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Answer: 100oC

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Question: Frost can begin to appear outside with the temperature starts to drop below this temperature on the Fahrenheit scale

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Answer: 32oF

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Question: The temperature scale that can never reach -10o

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Answer: Kelvin

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Question: Absolute zero is when all molecular motion stops. That is zero on which scale?

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Answer: 0oK

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Question: The heat energy needed to melt a substance.

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Answer: The Heat of Fusion

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Question: The heat of fusion constant for water.

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Answer: 340 J/g

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Question: Specific heat constant for water is 1.0 cal/goC and ______ J/goC

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Answer: 4.2

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Question: The heat energy needed to boil a substance

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Answer: the Heat of Vaporization

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Question: the heat of vaporization constant for water

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Answer: 2300 J/g

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