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Chemistry > Chapter 9 Stoichemetry And 12 Gas laws > Flashcards

Chapter 9 Stoichemetry And 12 Gas laws Flashcards

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1
Q

What kind of relationships does stoichiometry deal with?

A

QUANTITIVE between reactants and’s products

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2
Q

Progression of stoichiometry formulas

A

Grams of A
Moles of A
Mole ratio
Moles of B
Grams of B

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3
Q

Stiochemetry steps

A

Start with either reactant
Find which is limiting
Keep left of yields arrow

Step 2
Start with limiting
What do they want in the answer?

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4
Q

Kinetic theory of matter is??

A

All particles are always in motion

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5
Q

Do gas particles attract or repel each other?

A

No

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6
Q

Do gases have different KE at the same temp?

A

No
They have the same temp
And average KE IS proportional to the Kelvin temp

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7
Q

Diffusion is

A

Spontaneous mixing of gases based on constant random motion
(Perfume down the hall)

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8
Q

Effusion is?

A

Moving of a gas through a TINY opening

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9
Q

Grahams law of diffusion /effusion

A

Light brown effing/diff graham
cracker traveling fast as waved about,
2 gasses same p&t proportional 2density
————-
Lighter gases travels faster

Two gases at same temp and pressure
Inversely proportional to square root of densities

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10
Q

Pressure unit

A

Pascal is SI unit
(P= force per unit area)

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11
Q

Barometer invented by and’s explain it

A

Toricelli

Open pan mercury tall thin tube upwards

Measure mercury as goes up the lines in the tube

mm Hg

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12
Q

What is atm?

A

Atmospheric pressure

Reminder equation on test sheet converts atm mmHg torr

101.3 kPa equals 760 torr= 760 mmHg

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13
Q

Boules gas law is

If pressure of fixed amount of gas increased what happens to volume?

A

At CONSTANT TEMP
volume of fixed amount of gas
inversely proportional to pressure

Volume decreased

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14
Q

Boules law (inverse) shown on graph?

A

Hyperbola graph

L shaped

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15
Q

STP EQUALS

A

Standard temp and pressure

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16
Q

When doing equations what to predict first?

A

Predict answer before beginning

AND’S ALWAYS USE UNITS!!!

17
Q

Charles law is what??

Shown as what graph

A

TV LAW

volume /temp

Volume of fixed gas directly proportional to kelvin temp as long as
PRESSURE REMAINS CONSTANT

Linear

18
Q

Gay - lussac law is

A

Gay Kelvin under pressure

Pressure of fixed mass of gas proportional to Kelvin temp if volume is constant

Linear and’s direct proportion

19
Q

Daltons partial pressure law

A

The total pressure of a mixture of gases
Is the sum of the partial pressures exerted by each of the gases

Need for deducting water vapor pressure when collecting gas over water in lab

20
Q

How do you change a formula if a gas is collected over water?

A

Look up in the table what the pressure of the gas is dependent on the temp and’s subtract that pressure
(water is 26.7 mmHg if degrees C)

21
Q

Gay lussac law of combining volumes

A

When measured at same temp and pressure
Volume of reacting gasses can be expressed as ratio of small whole numbers

(Didn’t understand diatomic yet)

22
Q

Avogadros law (or hypothesis)

A

Equal volumes of different gases
at the same temperature and pressure contain the same number of particles


Equal volumes… Equal particles 

23
Q

What IS the MOLAR VOLUME AT STP?

A

22.4 L

STP is at 1 atm
273 K

24
Q

The density of gas at STP is what?

A

No matter what gas the volume of one mole of gas at STP is always 22.4 L. 

25
Q

If we are using the molar volume in a calculation, we must also use what?

A

Molar mass 

26
Q

When the temp of a gas changes what really changes?

A

The volume/density changes a lot!

27
Q

Volume is inversely, proportional to what and whos law is it

A

Pressure
Boyles

28
Q

Volume is proportional to what and who’s law is it?

A

Temperature
Charles

29
Q

Volume is proportional to what and who is law is it?

A

Particles
Avogadro

30
Q

n = what in formulas

A

Mole of gas

31
Q

If being asked for volume of a gas when all in reaction are gasses
Start with volume of gas given, multiple by ratio of gasses given in equation

A

250 mL H2 x (1 mL O2/2 mL H2) =
125mL O2

32
Q

mmHg\atm = PRESSURE

A
33
Q

STP=

A

1atm
273 K

Chemistry (15 decks)

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