Unit 11

If two objects have different temperatures when they come in contact, heat will flow from the warmer object to the cooler one UNTIL ____________

• one reaches a temperature of zero

• they both have an equal temperature

• one runs out of energy

If 980. J of energy is added to 6.20 g of water at 18.0 °C, what is the final temperature of the water? (The specific heat of water is 4.18 J/g°C.)

• 37.8 °C

• -19.8 °C

• 19.8 °C

• 55.8 °C

A piece of copper alloy with a mass of 85.0 g is heated from 30.0°C to 45°C. In the process, it absorbs 523 J of energy as heat. What is the specific heat of the copper?

• 0.41 J/g°C

• 0.73 J/g°C

• 0.29 J/g°C

• 0.57 J/g°C

A sample of iron receives 50.J of heat energy that raises the temperature of the iron by 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?  (show your work)

• 25g
• 30g
• 20g
• 50g

Heat is the _______ of energy.

• Transfer
• Measure

Temperature is the ________ of energy.

• Transfer
• Measure

The molecules of a liquid vs. a solid....

• Move slower in a liquid.
• Move slower in a solid.

Calorie is a measure of

• Energy

• Weight

• Distance

• Volume

One calorie

• 4.400 joules

• 4.290 joules

• 4.186 joules

• 4.900 joules

One kilocalorie is

• 2000 calories

• 10000 calories

• 1000 calories

• 100 calories