Unit 3day 4

Question 1

Write formula for partial pressure of blue

Using ideal gas law

Answer 1

Pblue = nblueRT/ V

Question 2

Formula for total pressure of blue and green

Answer 2

Ptotal = Pblue + Pgreen

Question 3

Write formula for P total

Using ideal gas law

Answer 3

P tot= ntotRT/ V

Question 4

Write formula , for partial pressure of blue gas

Using mol fraction

Answer 4

Pblue = mole fraction(X) blue * Ptot

Question 5

Write formula for mole fraction(X) of blue

Using moles

Answer 5

n blue/ n total

Question 6

Equation for tank valve problems ( one has O2, one has N2)

Answer 6

PO2V1 = P’O2Vtot

PN2V2 = P’N2Vtot

Question 7

Write the formula for total pressure for the tank valve problem

Gases are O2 and N2

Answer 7

Ptot= P’O2 + P’N2

Question 8

Which ballon will have the most efficient reaction? Loudest bang?

Answer 8

The one with the most equal mole fraction to molecular formula (empirical)

Question 9

Ideal gas descriptions

Answer 9

TEAR

Tiny- small discrete, far apart
Elastic/Energy - no energy lost or gained
Asexual- not attracted to each other
Random - molecules are constant, random , straight line motion, until they hit a wall

Question 10

When ranking samples form highest to lowest average KE consider

Answer 10

ONLY consider temp

High temp has higher KE

Question 11

Rank samples from highest to lowest velocity CONSIDER

Answer 11

consider both smallest particle(those will be faster) and temp, then use equation if different temp and contradicting different size particles

High temp small particles are faster

Question 12

Equation for KE of gases with ideal gas law

Answer 12

KE = 3/2RT

Question 13

What does R equal for KE formula with ideal gas law

Answer 13

R = 8.314 J/ mol K

Question 14

Regular formula for KE

Answer 14

KE= 1/2m(v^2)

Question 15

What are the units for the regular KE formulas

Answer 15

M (mass) is in Kg
v (velocity) is In m/s(meters per sec)

Question 16

Which molecule is the lightest for probability density graphs

Answer 16

The one that has the flattest most spread out graphs, reaches the highest speed

Question 17

Which molecule is the heaviest for probability density graphs

Answer 17

The molecule that has the highest peak and spreads the least over the x axis, lowest speeds

Question 18

How does cold molecule graph look

Answer 18

Narrow distribution

Question 19

How does hot molecule graph look

Answer 19

Wide distribution

Question 20

Root mean square velocity , Vrms FORMULA

Answer 20

square root of (3RT/mm)

mm in kg/mol

Question 21

What unit is the mass in for Vrms

Root mean square velocity

Answer 21

The molar mass of the element converted to Kg

Question 22

Diffusion

Answer 22

Intermingling of gases due to their random motion

Question 23

Effusion

Answer 23

Escape of gas particles through tiny holes

Question 24

Write mole fraction(X) for blue using pressure

Answer 24

Pblue/P total

Question 25

What units does Vrms equation give you

Answer 25

M/s

Question 26

What size of particles effuse the best

Answer 26

Small particles effuse faster

Question 27

If there’s a solid formed between 2 gases in a tube, where will the precipitate form close to?

Answer 27

Next to the gas aight he greater radius because it effuses slower

Question 28

Grahams law With velocity

Answer 28

Va/Vb = sq rt ( mmb/ mma)

Question 29

When to use grahams law with velocity

Answer 29

When there’s the same temp and it’s the same molecule you’re comparing

Question 30

Grahams law with temperature

Answer 30

Rate a/ rate b = sq rt(Ta/Tb)

Question 31

When to use grahams law with temp(rates)

Answer 31

Diff temps same molecule

Question 32

If Z is greater than 1, what are the interactions between gas particles

Answer 32

Repulsions

Question 33

If Z is less than 1, what are the interactions between gas particles

Answer 33

Attractions

Question 34

How do repulsion’s affect pressure

Answer 34

There are more collisions, higher pressure

Question 35

How do attractions affect pressure

Answer 35

Less collisions, lower pressure

Question 36

If the experimental pressure is greater than the ideal pressure what does that mean for the interactions between the gas particles

Answer 36

Repulsions

Question 37

If the experimental pressure is LESS than the ideal pressure what does that mean for the interactions between the gas particles

Answer 37

Attractions

Question 38

Gases behave most ideally at?

Answer 38

High temp and low pressure

Question 39

Why do gases behave most ideally at high temp and low pressure

Answer 39

A lot of space, so less collisions, and ideally, gases are hot because they come as a result of boiling

Question 40

What rules are not followed for real gases

Answer 40

T- Gases are not spaced far apart A- gases are not asexual because they are not spaced far apart^, they are attracted to each other

Question 41

What does Z equal for an ideal gas

Answer 41

1

Question 42

What does Z less than 1, mean for IMFs?

Answer 42

High attraction forces if Z < 1 so strong IMFs

Question 43

Hard square Model equation

Answer 43

P(V-nb)= nRT

Question 44

What does v equal in hard square model ?

Answer 44

Volume of container

Question 45

What does nb equal in hard square model

Answer 45

Space occupied by gas

Question 46

Van der Waals Equation

Answer 46

(P +a*(n^2)/(v^2))*(v-nb) =nRT

Question 47

What does a equal in van der waals equation (Include units)

Answer 47

Attractive forces Atm*L^2/ mol^2

Question 48

What does b equal in hard square model Include units

Answer 48

Size factor L/mol

Question 49

How do IMFS impact a in van der waals equation

Answer 49

Strong IMFS means large a

Question 50

How does size impact b in hard square model

Answer 50

Large size(radius) means large b

Question 51

When you think of diffusion think of

Answer 51

Mizing

Question 52

When you think of effusion think of

Answer 52

Escape

Question 53

The rate of effusion or diffusion equation

Answer 53

Va/vb = sq rt(mm a/mm b)

Question 54

What do mol fractions and ONLY mol fractions add to?

Answer 54

1

Question 55

What is the unit produced by the standard KE formula

Answer 55

Joules

Question 56

What is v in KE = 1/2mv^2

Answer 56

Velocity

Question 57

How many mL is 1cm^3

Answer 57

1 mL