Chapter 5

Question 1

What is Temperature?
Measure of _________

Answer 1

“hotness”

Question 2

Units Celsius °C, Kelvin K, (Fahrenheit °F)
A change of __ °C = a change of __ K
__ °C = _______ K
0 K = absolute zero (lowest possible temp)

Answer 2

1 (x2), 0, 273.15

Question 3

Energy always moves from a _____________________________________.

Answer 3

Hotter (higher temperature) to a cooler (lower temperature)

Question 4

If you have 1 drop of boiling water vs. a bucket of boiling water…
Do they have the same temperature?
Do they have the same thermal energy?
A. Yes
B. No

Answer 4

A, B

Question 5

At a given temperature, do all the atoms in a gas move at the same speed?
A. Yes
B. No

Answer 5

B

Question 6

Can an individual gas particle have a temperature?
A. Yes
B. No

Answer 6

B

Question 7

What happens to the average velocity of a gas if the temperature increases?
A. Increase
B. Decrease
C. No effect

Answer 7

A

Question 8

Now we have samples of different gases at the same temperature. Which has the highest average kinetic energy?
A. Ne
B. Ar
C. Kr
D. Xe
E. Average KE’s are the same

Answer 8

E

Question 9

At a given temperature ___________________________.

Answer 9

The average KE of all gases is the same

Question 10

If the molar mass of the gas increases, what happens to the average velocity?
A. Increase
B. Decrease
C. No effect

Answer 10

B

Question 11

Since the temp isn’t changing, the velocity must __________ when the molar mass increases.

Answer 11

Decrease

Question 12

Molecules collide with each other and therefore don’t move in a straight line (_____________).

Answer 12

Brownian motion

Question 13

We’ve seen that temperature is a measure of average kinetic energy. KE is normally associated with translation. But there are other forms of movement (eg rotation and __________) that are important for more complex substances.

Answer 13

Vibration

Question 14

SLIDE 21

Question 15

__________: energy associated with motion of particles (unit is Joule)

Answer 15

Thermal energy

Question 16

__________: strictly defined as the transfer of thermal energy from one place to another (eg by collisions of molecules)

Answer 16

Heat

Question 17

__________ – energy required to raise 1 g by 1 °C (or 1 K)

Answer 17

Specific heat

Question 18

__________ – energy required to raise 1 mol by 1 °C (or 1 K)

Answer 18

Molar heat capacity

Question 19

Does this form of water have IMFs?
Steam (H(sub 2)O(g))
A. Yes
B. No

Answer 19

B

Question 20

Does this form of water have IMFs?
Water (H(sub 2)O(l))
A. Yes
B. No

Answer 20

A

Question 21

Moving from solid 🡪 liquid 🡪 gas
Energy ________

Answer 21

Absorbed

Question 22

Moving from gas 🡪 liquid 🡪 solid
Energy ________

Answer 22

Released

Question 23

During a phase change the temperature _____________.

Answer 23

Remains constant

Question 24

_________ – can transfer energy and matter (biological systems)

Answer 24

Open

Question 25

_________ – transfer energy but not matter (a closed container)

Answer 25

Closed

Question 26

_________ depend only on the initial and final states.

Answer 26

State functions

Question 26

_________ – no transfer of matter or energy

Answer 26

Isolated

Question 27

_________ depend on how change takes place.

Answer 27

Path functions

Question 28

Heat in: _________
∆H +

Answer 28

Endothermic

Question 29

Heat out: _________
∆H –

Answer 29

Exothermic

Question 30

Wood burning
A. Exothermic
B. Endothermic
C. It depends

Answer 30

A

Question 31

Water freezing
A. Exothermic
B. Endothermic
C. It depends

Answer 31

A

Question 32

Sweat Evaporating
A. Exothermic
B. Endothermic
C. It depends

Answer 32

B

Question 33

Chemical hand-warmer
A. Exothermic
B. Endothermic
C. It depends

Answer 33

A

Question 34

Which would have a higher ΔH (sub vap)?
A. CH(sub 3)OH
B. CH(sub 3)CH(sub 3)
C. Same

Answer 34

A