Heat Energy

Fill in the blanks. An iron sheet will _________ when heated and will ________ when left to cool.

• expand, contract

• contract, expand

• gains heat, loses heat

• loses heat, gains heat

Which of the following are not the three states of substances ?

• Liquid

• Solid

• Vapor

• Gas

Substances can change in state when heated. When a liquid turns into a gas, this is called ?

• Fusion

• Vaporization

• Sublimation

• Condensation

Substances can change in state when it loses heat. When a liquid turns into a solid, this is called ?

• Freezing

• Vaporization

• Sublimation

• Condensation

Which of the following factors does not relate to the amount of heat that changes the temperature of a substance?

• Mass

• Specific heat of a substance

• Specific latent heat of a substance

• The change in temperature of a substance

What is the amount of heat needed to increase the temperature of water at 25 Celsius, with a mass of 30 g, to 50 Celsius (give that the specific heat of water is 4.2 kJ/kgK). Which of the following fomula to according ?

•  Q=mcΔt  

• Q=mL  

• Q=mcΔt+mL 

• Q=mcΔt+mL+mcΔt  

 

If I heat up 2 pans of water one has 100 mL in it and one has 1000mL. Which one heats up the fastest?

• 100 mL

• 1000 mL

• They both heat up at the same speed

• They cool down.

Which of the following best explains why the sand at the beach is hotter than the water?

• Sand has a higher specific heat than water.

• Sand has a lower specific heat than water.

• There is more water than sand at the beach.

• There is more sand than water at the beach.

When a  piece of aluminum foil is taken out of the oven and cools from 100° to 50°, What is the change in temperature?

• 50°

• 0°

• 100°

• 150°

The amount of energy required to raise the temperature 1ºC for every gram is called____?

• Thermal Energy

• Specific Heat

• Temperature

• Kinetic Energy