ENDTERM

Question 1

Adding energy to the system,
or removing it, changes the
system’s thermal energy. True of False?

Answer 1

True

Question 2

What happens to a system when you change
its thermal energy?

Answer 2

The temperature of the system changes. The system undergoes a phase change, such as melting or freezing

Question 3

Adding _____ C of energy raises the temperature of __ kg of water by __ K.

Answer 3

4190C, 1kg , 1K

Question 4

How much energy you will need in order for you to raise the temperature of a 1kg gold by 1 K?

Answer 4

129 J

Question 5

What is the heat equation?

Answer 5

Q = mc△T, where:
m = mass of object (g)
c = specific heat of the object (cal / gram C)

Question 6

The amount of energy that raises the temperature of 1 kg of a substance by 1 K is called the ______.

Answer 6

Specific Heat

Question 7

_____ has specific heat (c) = 4190 J/kg K.

Answer 7

Water

Question 8

The specific heat of gold is c gold = ?

Answer 8

129 J/kg K

Question 9

It is a measure of a material’s resistance to temperature change.

Answer 9

Thermal Inertia ( T = square root of (density x heat conductivity x specific heat)

Question 10

The molar specific heat is the
amount of energy that raises
the temperature of ____ mol of a substance by ____ K.

Answer 10

1 mol, 1K

Question 11

Most solids have molar heat capacity very near at __ J/mol K.

Answer 11

25

Question 12

The slope of the graph depends inversely on the system’s specific heat. True or False?

Answer 12

True

Question 13

The thermal energy continues to increase during a phase change, but the additional energy goes into _____ molecular bonds rather than ______ the molecules.

Answer 13

breaking , speeding up

Question 14

Spot the incorrect word.

A phase change is characterized by a change in thermal energy with a change in temperature.

Answer 14

‘with’ should be ‘without’.

Question 15

The amount of heat energy that causes1 kg of a substance to undergo a phase change is called the ______ of that substance.

Answer 15

heat of transformation

Question 16

________ is a generic term that refers to any phase change.

Answer 16

Heat of transformation

Question 17

Two specific heats of transformation are the ______ , the heat of transformation between a solid and a liquid, and the _______ , the heat of transformation between a liquid and a gas.

Answer 17

heat of fusion, heat of
vaporization

Question 19

When two objects are in direct contact, such as soldering iron and the circuit board, heat is transferred by

Answer 19

conduction

Question 20

Air currents near a lighted candle rise, taking thermal energy with them in a process.

Answer 20

convection

Question 21

Blowing a hot cup of tea or coffee cools.

Answer 21

Evaporation

Question 22

Wc

Answer 22

work by conservative forces

Question 23

Is the energy transferred between system and the environment when a net force acts on a system

Answer 23

Work

Question 24

What does the mechanical interaction process means?

Answer 24

system and the environment interact via macroscopic pushes and pull

Question 25

Work is positive when the force us in direction of motion and negative if otherwise.

Answer 25

Agreeyana Grande