quiz 4

Question 1

What does it mean when collisions are elastic

Answer 1

they dont lose kinetic energy

Question 2

What can change the pressure of a gas

Answer 2

area

Question 3

What can charge the force of a gas

Answer 3

adding gas

Question 4

how can you compress a gas sample

Answer 4

use a piston to decrease volume

Question 5

what is kinetic molecular theory

Answer 5

1. gas molecules are tiny and afr apart from each other
2. constantly moving in random directions
3. collision are elastic
4. no intermolecular forces
5. KE (half infinity) T

Question 6

what happens when volume decreases

Answer 6

of collisions/time increases

force increases
Area decreases
pressure increases

Question 7

formula relating pressure and volume

Answer 7

P1V1=P2V2

P(alpha)1/V

Question 8

what happens when you blow into a balloon?

Answer 8

n increases
collisions increase
pressure increases
volume increases to keep pressure constant
pressure inside= pressure outside

Question 9

formula relating volume and moles (n)

Answer 9

V1/N1=V2/N2

Question 10

what happens if you heat a balloon?

Answer 10

temperature increases
velocity increases
collisions increase
pressure increases in balloon
volume increases to keep pressure constant

Question 11

what is the relationship with temperature and volume

Answer 11

directly proportional

Question 12

what is a formula relating temperature and volume

Answer 12

T1/V1=T2/V2

Question 13

If you want the pressure of a sample of gas to go down, what could you do?

Answer 13

increase volume
decrease temperature
decrease moles (n)

Question 14

what are the important relationships (parameters) for a gas?

Answer 14

V(alpha)1/P
V(alpha)n
V(alpha)T

Question 15

how to convert Celsius to K

Answer 15

add 273.15

Question 16

density formula

Answer 16

d=m/v

g/mL

Question 17

Molarity formula

Answer 17

MM=m/n

MM=dRT/P

Question 18

partial pressure formula for a mixture of gases

Answer 18

Ptotal= Pa+Pb+Pc+…
P=nRT/V
=(na+nb+nc)(RT/V)

Question 19

What formula do you use to find the partial pressure of each gas

Answer 19

Pgas=Xgas(Ptotal)

X=moles/mole percent divide by 100

Question 20

how to find mole fraction

Answer 20

na/ntotal=xa

a=specific gas

Question 21

what is diffusion

Answer 21

moving from higher concentration to lower “spreading out” of molecules

Question 22

What does diffusion depend on

Answer 22

Temperature and molar mass

Question 23

What happens when temperature increases in a diffusion

Answer 23

molecules travel faster

Question 24

what happens when molar mass increases in a diffusion

Answer 24

diffusion rate decreases

Question 25

What is effusion

Answer 25

“leaking through a hole”

Question 26

What does effusion depend on?

Answer 26

Temperature, molar mass

Question 27

What happens when you increase temperature in an effusion

Answer 27

effusion rate increases

Question 28

What happens when you increase molar mass in an effusion

Answer 28

effusion rate decreases

Question 29

what gases leave balloons first, vice versa

Answer 29

smaller gas particles escape first, larger last

helium would be first