Physics- Thermodynamics

Endothermic phase changes include

• conduction, convection and radiation
• freezing and condensation
• vaporization and condensation
• melting, boiling, evaporation and sublimation

Absolute zero is __________.

• 273.15 K

• 273.15 F

• -273.15 C

• -273.15 K

You have equal masses of four of the substances listed. All are at the same initial temperature. If you place them in a warmer room, which of the substance's temperature will increase most rapidly?

• Iron

• Aluminum

• Lead

• Zinc

The thermal energy needed to boil a liquid is the heat of __________.

• Condensation

• Vaporization

• Fusion

• Specific heat

Using information from the table below, determine which of the following processes requires the most added energy.

• 1 kg of iron is changed from liquid to gas.

• 2 kg of water is evaporated.

• 1 kg of liquid mercury is frozen.

• 1 kg of copper is converted from solid to liquid.

How much thermal energy must be added to a 250-g aluminum pan to raise its temperature from 20⁰C to 85⁰C? The specific heat of aluminum is 897 J/(kg •K).

• 1.5 x 10⁴ J

• 1.0 x 10⁶ J

• 1.45 x 10⁷ J

• 2.3 x 10⁴ J

The heat from a hot burner to a pot is transferred by ______.

• convection
• insulation
• radiation
• conduction

The amount of thermal energy required to raise the temperature of one (1) kilogram of a substance by 1^o C is known as:

• Specific heat
• Heat of fusion
• Heat of vaporization
• Melting point

Temperature is a measure of the...

• total energy in a substance
• total kinetic energy in a substance
• average potential energy in a substance
• average kinetic energy of molecules in a substance

A gas being warmed

• 1

• 2

• 3

• 4

• 5