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1

What would be the greatest effect of the finite size of molecules on the ideal gas law?

At high densities, the pressure would be less than that predicted by the ideal gas law.

2

What would be the greatest effect on the ideal gas law if there is a slight attractive force between the molecules?

At low temperatures, the pressure would be less than that predicted by the ideal gas law.

3

What would be the greatest effect on the ideal gas law if there is a slight repulsive force between the molecules?

At low temperatures, the pressure would be greater than that predicted by the ideal gas law.

4

The average molecular kinetic energy of a gas can be determined by knowing only the -- of the gas.

temperature

5

A sample of an ideal gas is slowly compressed to one-half its original volume with no change in temperature. What happens to the average speed of the molecules in the sample

It does not change.

6

A container is filled with a mixture of helium and oxygen gases. A thermometer in the container indicates that the temperature is 22°C. Which gas molecules have the greater average kinetic energy?

It is the SAME for both because the temperatures are the same.

7

A container is filled with a mixture of helium and oxygen gases. A thermometer in the container indicates that the temperature is 22°C. Which gas molecules have the greater average speed?

The helium molecules because they are less massive.

8

Phase change occur as the temperature

remains the same

9

The point in the phase diagram where the fusion curve, the vapor pressure curve, and the sublimation curve join is called the

triple point

10

The point in the phase diagram where the vapor pressure curve ends is called the

critical point

11

When a solid melts, heat energy -- the substance

enters

12

When a liquid freezes, heat energy -- the substance

leaves

13

By what primary heat transfer mechanism does one end of an iron bar become hot when the other end is
placed in a flame?

conduction

14

The type of heat transfer that occurs between a stove and a pot placed on it is

conductive

15

The type of heat transfer that occurs between the radiator of a car and the atmosphere, when the car is in
motion, is principally

convective

16

The type of heat transfer that occurs between warm food and the air in the room is principally

convective

17

Convection can occur

only in liquids and gases

18

The process whereby heat flows in the absence of any medium is referred to as

radiation

19

The process whereby heat flows by the mass movement of molecules from one place to another is referred to
as

convection

20

The process whereby heat flows by means of molecular collisions is referred to as

conduction

21

Consider two cylinders of gas identical in all respects except that one contains O2 and the other He. Both hold the same volume of gas at STP and are closed by a movable piston at one end. Both gases are now
compressed adiabatically to one-third their original volume. Which gas will show the greater pressure increase?

the He

22

Consider two cylinders of gas identical in all respects except that one contains O2 and the other He. Both hold the same volume of gas at STP and are closed by a movable piston at one end. Both gases are now
compressed adiabatically to one-third their original volume. Which gas will show the greater temperature increase?

the He

23

An ideal gas starts in state A at temperature T. The gas expands to new volume V by an adiabatic process
and its final temperature is T'. What is the relationship between T and T'?

T > T'

24

When a gas expands adiabatically,

the internal energy of the gas decreases

25

During which type of process applied to an ideal gas is there no change in internal energy of the gas?

isothermal

26

During which type of process applied to an ideal gas is there no heat added to the gas?

adiabatic

27

During which type of process applied to an ideal gas is there no work done by the gas?

isochoric

28

When the first law of thermodynamics, Q = ΔU + W, is applied to an ideal gas that is taken through an
isochoric process,

W = 0

29

When the first law of thermodynamics, Q = ΔU + W, is applied to an ideal gas that is taken through an
adiabatic process,

Q = 0

30

When the first law of thermodynamics, Q = ΔU + W, is applied to an ideal gas that is taken through an isothermal process,

ΔU = 0