Heat Review

Kinetic energy is the energy an object has due to its

• mass

• weight

• motion

• position

Convert 20°C into °F.

• 7.2°C

• 32°C

• 75.2°F

• °68

The slower molecules move, 

• the higher the temperature
• the less temperature
• the same temperature
• I don't know

If two objects have reached the same temperature they have reached:

• a melting point.
• a boiling point.
• thermal equilibrium.
• specific heat.

A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C.  Calculate the specific heat capacity of iron.    

• 0.46 J/gx^oC
• 1.654 J/gx^oC
• 2,567,446.875 J/gx^oC

A high specific heat means...

• It heats up quickly with energy added
• It requires more energy to change temperature

Latent heat is

• the heat absorbed or released at a boiling process during a change of phase

• the heat absorbed or released at a constant temperature during a change of phase

• the heat absorbed or released at a constant temperature during a change of phase of 1 kg object

• the heat absorbed or released by an object to increase or decrease its temperature by 1 degree Celcius

Water molecules have the greatest kinetic energy in

• Ice at 0 ⁰C

• Water at 90 ⁰C

• Water at 373 K

• Steam at 150 ⁰C

What would be the effect on the particles if more heat is supplied to the system?

• They would slow down
• They would stop moving
• They would speed up
• There would be no effect

Given that the specific latent heat of fusion of a sample is 550 kJ kg^-1. Which of the following is correct?

• The mass of this sample is 1 kg.

• The energy needed to increase the temperature of 1 kg of this sample in solid state through 1^oC is 550 kJ.

• The energy needed to increase the temperature of 1 kg of this sample in liquid state through 1^oC is 550 kJ.

• The energy needed to change 1 kg of the material from solid state to liquid state is 550 kJ.