Unit 3 Test Review

What is the measurement of the average kinetic energy of a substance?

• Kinetic energy

• Temperature

• Potential energy

What happens when ice cubes melt in a glass?

• Heat travels from the ice to the warmer water.
• No energy is transferred.
• Heat is transferred from the warmer water to the ice cubes.

Which direction will the heat flow while this person holds a hot cup of tea?

• from the cup to her hand
• from her hand to the cup
• no heat is transferred

Cold Pack on Person

• Heat is transferred from the cold pack to the person.

• Heat is transferred from the person to the cold pack

Hand Warmer in a Hand

• The hand is getting warmer. The hand warmer is getting cooler.

• The hand warmer is getting warmer. The hand is getting cooler.

What is the measurement of the average kinetic energy of a substance?

• Kinetic energy
• Temperature
• Thermal energy
• Potential energy

Which will most likely occur when raw egg is placed on black pavement on a hot, summer day?

• The pavement will conduct the heat and cook the egg.
• The egg will reflect the heat and make the pavement hotter underneath.
• The egg will absorb the heat  and leave the pavement hotter underneath.
• The pavement will absorb the heat from the egg, and the egg will stay raw.

Which direction is heat flowing in the picture?

• from the hand to the ice
• from the ice to the hand
• heat is not being transferred
• there is no way to tell

In heat transfer, heat always flows from the _______________ substance to the _______________ substance.

• Hotter to colder

• Colder to hotter

• Hotter to hotter

• Colder to colder

What happens to particles as you add thermal energy?

• Molecules speed up and contract, causing the material to expand.

• Molecules break apart and the atoms spread out.

• Molecules speed up and spread out, causing the material to expand.

• Molecules slow down and begin to contract.