Test 4: Gases Lecture 1

Question 1

5 Components of the Kinetic Molecular Theory of Gases

Answer 1

1 - Gases consist of many particles moving at random
2 - The amount of space occupied by the gas particles themselves is much smaller
than the amount of space between the particles
3 – Gas particles do not have appreciable attractive or repulsive forces between
them
4 – The average kinetic energy of gas particles is proportional to the temperature
5 – Collisions of gas particles are elastic

Question 2

The amount of __occupied by the gas particles themselves is much __than the
amount of __between the particle

Answer 2

space; smaller; space

Question 3

Gases consist of many particles moving __

Answer 3

at random

Question 4

Gas can be contained into a small volume because it is __

Answer 4

highly compressible

Question 5

Gas particles do not have appreciable attractive or repulsive forces between them because __

Answer 5

the particles are too far apart from one another

Question 6

Average kinetic energy is proportional to the __

Answer 6

temperature

Question 7

Collisions of gas particles are elastic, meaning that

Answer 7

no energy is gained or lost in the collision, only transferred.

Question 8

Measurements of gas

Answer 8

pressure, volume and temperature

Question 9

Symbol for pressure

Answer 9

Capital letter “P”

Question 10

Pressure

Answer 10

The force exerted on an area

Question 11

Unit of measurement for gases

Answer 11

Hg (Torr) and atm

Question 12

atm

Answer 12

atmospheric pressure on earth

Question 13

1 atm=__mm Hg

Answer 13

760 mm Hg

Question 14

Volume (V)

Answer 14

measure of total space occupied.

Question 15

Standard unit of Volume (V)

Answer 15

Liter/ mL

Question 16

Do gases have a defined volume?

Answer 16

No, they expand to occupy any space they are in

Question 17

Temperature (T) represents __ of the gas molecules

Answer 17

kinetic energy

Question 18

For calculations involving the temperature of a gas we must always use temperature in units of

Answer 18

Kelvin, K

Question 19

Celsius to Kelvin Formula

Answer 19

°C + 273.15 = K

Question 20

Individual gas law’s describe the relationship between (4)

Answer 20

pressure, volume, temperature and molar

Question 21

Individual Gas Law Name’s (4)

Answer 21

Boyle’s law, Gay-Lussac’s law, Charle’s law, Avogadro’s law

Question 22

Boyle’s Law

Answer 22

The relationship between pressure and volume. No matter how the pressure or temperature changes from initial conditions, the product of the initial volume and pressure will always equal the product of the final volume and pressure

Question 23

How is Boyle’s Law (pressure/volume) expressed mathematically?

Answer 23

P1V1 = P2V2
(at constant temperature)

Question 24

Gay-Lussac’s Law

Answer 24

Relationship between pressure and temperature (at a constant volume)

Question 25

How is Gay-Lussac’s Law (pressure & temperature) expressed mathematically?

Answer 25

P1/T1=P2/T2

Question 26

The combined gas law allows us to

Answer 26

compare all three quantities (temp, pressure, volume) in a sample of gas where NONE of these remains constant.

Question 27

Charles’s Law

Answer 27

for a sample of gas at constant pressure, Volume and Temperature are directly related, and the ratio of the two is constant.

Question 28

How do we express Charles’s Law (volume & temperature) mathematically?

Answer 28

V1/T1=V2/T2

Question 29

Cross multiply method

Answer 29

multiply the top factor on the left side with the bottom on the right side, and vice versa. These multiplied factors are equal.
V1/T1=V2/T2 -> V1T2=V2T1

Question 30

Avogadro’s Law

Answer 30

at constant pressure and temperature, the volume of a gas is directly proportional to the number of moles it contains.

Question 31

Avogadro’s law is expressed mathematically as

Answer 31

1mole gas=22.4 Liters (at STP)

Question 32

STP

Answer 32

Standard temperature (0 °C) and pressure (1atm)

Question 33

In Charles’s law temperature must be converted to

Answer 33

Kelvins

Question 34

Individual gas laws are valid only at a __ temperature, volume and pressure

Answer 34

constant

Question 35

The combined gas law allows us to compare

Answer 35

all three quantities in a sample of gas where NONE of these remains constant.

Question 36

Mathematical expression of the combined gas law

Answer 36

P1V1/T1 =P2V2/T2