Unit 1: Gases

Question 1

molar mass units

Answer 1

g/mol

Question 2

Avogadro’s number converts _________ to ____________

Answer 2

moles, particles

Question 3

percent yield formula

Answer 3

actual yield/theoretical yield x 100%

Question 4

if an object is more dense than water, it will ____________ when placed in water

Answer 4

sink

Question 5

if an object is less dense than water, it will __________ when placed in water

Answer 5

float

Question 6

solid water is __________ dense than liquid water

Answer 6

less

Question 7

ideal gas law formula

Answer 7

PV = nRT

Question 8

“at STP” means T = ____K and P = _ atm

Answer 8

273, 1

Question 9

one mole of any IDEAL gas occupies _______ at STP

Answer 9

22.4 L

Question 10

what is number density

Answer 10

moles per volume (mol/L)

Question 11

what is mass density

Answer 11

“density”; mass per volume (g/L)

Question 12

for an ideal gas, gases are very _________, __________ molecules, spaced ______________

Answer 12

small, discrete, very far apart

Question 13

for an ideal gas, molecules are in ____________, ______________, _____________ motion until they hit another molecule or wall

Answer 13

constant, random, straight-line

Question 14

for an ideal gas, any collision is perfectly ___________; no energy is ________ or __________

Answer 14

elastic, lost, gained

Question 15

for an ideal gas, gas particles do not __________ each other (there are no ______________ forces)

Answer 15

attract, intermolecular

Question 16

Root Mean Square Velocity (vrms) calculates the average ________ of particles in the units of ________

Answer 16

speed, m/s

Question 17

unit for mass in vrms?

Answer 17

kg/mol

Question 18

same temp = _________ KE

Answer 18

same

Question 19

Boyle’s Law formula

Answer 19

P1V1 = P2V2

Question 20

Charles’ Law formula

Answer 20

V1/T1 = V2/T2

Question 21

bigger the molecule, _________ the “b” value

Answer 21

bigger

Question 22

P (V - nb) = nRT
V = ?

Answer 22

measured volume

Question 23

P (V - nb) = nRT
nb = ?

Answer 23

volume if ideal

Question 24

gases behave most ideally at _______________________________

Answer 24

low pressures and high temperatures

Question 25

when comparing balloons, same volume = same number of ________ or _______________

Answer 25

moles, gas particles

Question 26

You have a 1L sample of gas in a container with movable walls. If you triple the pressure on the sample of gas, what would be the new volume?

Answer 26

1/3 = 0.33 L

Question 27

Increasing the temperature of a gas sample from 100°C to 200°C under constant pressure would cause the volume to ____________ by a factor of ________

Answer 27

increase, about 1.25
473K/373K = 1.26

Question 28

When comparing balloons, same pressure and temperature = ______________________________

Answer 28

same number density (mol/L)