Chapter 15: Heat

Question 1

When you touch a cold piece of ice with your finger, energy flows: from your finger to the ice; from the ice to your finger or both ways?

Answer 1

The energy flows from your finger to the ice.

Question 2

Which of the following normally warms up fastest when heat is applied: water, iron, glass, wood or all of the above?

Answer 2

Iron

Question 3

A substance that heats up relatively quickly has a?

Answer 3

Low specific heat

Question 4

Heat energy is measured in units of?

Answer 4

Joules and/or calories

Question 5

The moderate temperatures of islands throughout the world has much to do with water’s?

Answer 5

High specific heat

Question 6

Before ice can form on a lake, all the water in the lake must be cooled to?

Answer 6

4 degrees Celsius

Question 7

When an iron ring is heated, the hole becomes?

Answer 7

Larger

Question 8

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is?

Answer 8

Copper expands more than iron

Question 9

Which of the following expands most when the temperature is increased? Equal volumes of?

Answer 9

Helium

Question 10

The fact that desert sand is very hot in the day and very cold at night is evidence that sand has?

Answer 10

Low specific heat

Question 11

A measure of the average translational kinetic energy per molecule in a substance, measured in degrees Celsius or Fahrenheit or in kelvins (K).

Answer 11

Temperature

Question 12

The lowest possible temperature that a substance may have–the temperature at which molecules of the substance have their minimum kinetic energy.

Answer 12

Absolute zero

Question 13

The energy that flows from a substance of higher temperature to a substance of lower temperature, commonly measured in calories or joules.

Answer 13

Heat

Question 14

The total of all molecular energies, kinetic plus potential, that are internal to a substance.

Answer 14

Internal energy

Question 15

The quantity of heat per unit mass required to raise the temperature of a substance by 1 Celsius degree.

Answer 15

Specific heat capacity

Question 16

There is twice as much molecular kinetic energy in 2 liters of boiling water as in 1 liter of boiling water. Which will be the same for both: a) temperature; b) thermal energy; c) both a and b; d) neither a nor b

Answer 16

a) temperature;

Average kinetic energy of molecules is the same, which means temperature is the same for both.

Question 17

The same quantity of heat is added to different amounts of water. The temperature of the smaller amount of water: a) decreases more; b) increases more; c) does not change; d) not enough information

Answer 17

b) increases more

Question 18

You heat a half-cup of tea and its temperature rises by 4 degrees C. How much will the temperature rise if you add the same amount of heat to a full cup of tea: a) 0 degrees C; b) 2 degrees C; c) 4 degrees C; d) 8 degrees C

Answer 18

b) 2 degrees C

Question 19

When a sample of 0 degree C water is heated, it first: a) expands; b) contracts; c) remains unchanged; d) not enough information;

Answer 19

b) contracts;

Water continues to contract until it reaches a temperature of 4 degrees C. With further increase in temperature beyond 4 degrees, water then expands.

Question 20

When a sample of 4 degree C water is cooled, it: a) expands; b) contracts; c) remains unchanged; d) not enough information

Answer 20

a) expands;

Parts of the water will crystallize and occupy more space.

Question 21

Measures temperature by expansion or contraction of a liquid?

Answer 21

Thermometer (containing mercury or colored alcohol).

Question 22

Transfer of energy from a hot object (high temperature) to a colder object (low temperature).

Answer 22

Heat

Question 23

If you hold a cup of ice cold coke, your hand will soon become cold. Does cold flow from the coke to your hand?

Answer 23

No;

Cold does not flow form the coke to your hand. Heat flows from your hand to the coke. The cup of coke is cold to your touch because you are transferring heat to the cup.

Question 24

What substance has a higher capacity for storing energy than almost any other substance?

Answer 24

Water

Question 25

What temperature does the thermal expansion of water occur?

Answer 25

4 degrees C