Temp, volume, Pressure (Gases)

Question 1

We measure gases in Kelvin, not Celsius)

Kelvins =

Answer 1

degrees Celsius +273

Question 2

What is cubic centimeter abbreviated as? 1 cc is = to how much mL

Answer 2

cc
1 cc(cm^3) = 1 mL

Question 3

Pressure is = ____/____

Answer 3

Pressure = Force/Area

If you increase pressure, you decrease area

Question 4

__ atm = ___ torr = ___ mmHg (millimeter of Mercury)

Answer 4

1 atm= 760 Torr =760mmHg

Question 5

What are the 3 assumptions of an ideal gas?

Answer 5

1) the volume or size of each gas molecule is insignificant most accurate at LOW pressures
2) gas molecules collisions are perfectly elastic (they rebound off each other with sticking) most accurate at high temps and for gases with weak intermolecular forces
3) average kinetic energy of a gas depends only on the systems pressures

Question 6

Gases behave most ideally under ___ pressure and ____ temperature

Answer 6

LOW pressure and HIGH temp

Question 7

combined gas law

Answer 7

p1v1/n1t1 = p2v2/n2t2
p=pressure
v=volume
n=moles
t=temperature

Question 8

ideal gas law

Answer 8

PV = nRT

R=ideal gas constant=0.0821 Latm/molK

Question 9

STP stands for?

Answer 9

Standard Temperature and Pressure = 0 degrees celsius, 1 atm, 1 mol of any gas = 22.4 L

Question 10

Boyle’s Law

Answer 10

V = 1/P

Question 11

Charles’ Law

Answer 11

V = T, if everything else remains constant then V and T are directly proportional

Question 12

Avogadro’s Law

Answer 12

V = n (moles)

volume increases so does moles

Question 13

Dalton’s Law of Partial Pressures says?

Answer 13

that the total pressure inside a container filled with multiple gases is equal to the sum of all of those gases’ individual pressures
Ex: gasA =.3 atm, gasB=1 atm, gasC= .7atm >total pressure=.3+1+.7=2atm

Question 14

What gases would effuse more quickly?

Answer 14

lighter gases (with lower molecular weights) escape (or effuse) more quickly than heavier gases

Question 15

IF two gases are in the same container with the same temp, then they will have ___ kinetic energy?

Answer 15

the SAME kinetic energy

Question 16

In order for two different gases (with different masses) than the lighter gas MUST?

Answer 16

move quicker

Question 17

reality gas vs. ideal gas

Answer 17

• ideal gas is a theoretical gas whose behavior can be perfectly predicted by the ideal-gas law
• real gases DO have volumes and intermolecular forces

Question 18

The “real gas equation” corrects what two things fromideal gases?

Answer 18

1) an2/v2- intermolecular forces
2) nb- for volume
* The closer these two terms are to zero, the more ideally the gas will behave