Heat

Question 1

Which of the following is a measure of the average kinetic energy of particles in matter?

Answer 1

temperature

Question 2

What scientific tool can be used to measure the average kinetic energy of the molecules of a substance?

Answer 2

thermometer

Question 3

Which of the following statements best describes a state of thermal equilibrium between two systems?

Answer 3

Both systems have the same temperature.

Question 4

You begin heating a substance that is at a low temperature. What occurs to the particles when energy is transferred to the substance as heat?

Answer 4

The average kinetic energy of the particles increases.

Question 5

How are the Celsius and Kelvin temperature scales similar?

Answer 5

The difference of one thermal unit is the same for both scales.

Question 6

What is the quantity of energy required to raise 1 kg of a substance 1 degree celscius?

Answer 6

specific heat capacity

Question 7

What term is defined as the energy transferred between objects with different temperatures?

Answer 7

heat

Question 8

What must be true if energy is to be transferred as heat between two bodies in physical contact?

Answer 8

The two bodies must be at different temperatures.

Question 9

Which of the following statements correctly describes what occurs in a substance that undergoes thermal expansion?

Answer 9

As the temperature increases, the volume of the substance increases.

Question 10

Which property of a substance is NOT required to determine the amount of energy transferred as heat (Q) to or from the substance?

Answer 10

volume

Question 11

Which situation is a good example of the transfer of energy through radiation?

Answer 11

a snake’s body temperature increases when the snake lies in the sun

Question 12

What is the process by which energy is transferred by the motion of cold and hot matter suspended in either liquid or air?

Answer 12

convection

Question 13

heat transfer occurs between objects by direct contact

Answer 13

conduction

Question 14

Which of the following is NOT a good thermal insulator compared with the others?

Answer 14

iron

Question 15

Which of the following are ways in which energy can be transferred to or from a substance?

Answer 15

heat and work

Question 16

If energy is transferred spontaneously as heat from a substance with a temperature of T1 to a substance with a temperature of T2, which of the following statements must be true?

Answer 16

T1 > T2

Question 17

Which concept does the first law of thermodynamics describe?

Answer 17

conservation of energy

Question 18

Absolute zero is best described as the temperature at which:

Answer 18

The molecules of a substance have minimum kinetic energy

Question 19

For object A to have a higher temperature, than object B, object A must have a:

Answer 19

Higher average kinetic energy

Question 20

Define Thermodynamics:

Answer 20

Study of heat and transformation into other forms of energy

Question 21

A motor is required in a refrigerator to do work:

Answer 21

In order to transfer heat from a cold region to a hotter one

Question 22

Define the Second Law of Thermodynamics:

Answer 22

Heat will never of itself flow from a cold object to a hot object

Question 23

Define Absolute Zero:

Answer 23

No more energy can be extracted and temperature is lowest possible (no molecular movement)

Question 24

Work was done to freeze 1 kg of water. Which statement best describes what happened to this system?

Answer 24

Its entropy decreased.

Question 25

Heat will always flow from object A to object B if object B has lower __________.

Answer 25

temperature