chem gas laws test

Question 1

Why do you use the first and last data points and not consecutive data points when finding a value based on info from a chart

Answer 1

Error gets magnified when you use consecutive data points.

The margin of error is reduced with the greater range. The first and last points represent a complete set of data.

Question 2

What are the different values for pressure

Answer 2

1 atm= 14.7 psi= 760 torr= 760 mm Hg= 101300 Pa= 101.3 kPa

Question 3

What are the different values for pressure

Answer 3

1 ml= 1 c^3, 1000 ml= IL

Question 4

What must be true when using boyle’s law regarding moles and temp?
Is this a direct or indirect relationship

Answer 4

They must be constant

They are indirect

Question 5

What kind of relationship are charles and gay-lussac’s law

Answer 5

Direct

Question 6

What is the pressure at sea level?
What is absolute 0 pressure in kelvin
Psi=

Answer 6

1 atm
0 K
Pounds per square inch (tire pressure)

Question 7

Ideal gas law means ________…

Answer 7

Looking at a sample of gas at one point in time

Question 8

R=_________/_________

Answer 8

Ideal, universal gas constant (defines other units)

Question 9

Molar mass unit:

Answer 9

G/mol

Question 10

Dalton’s law of partial pressures applies to _____

Answer 10

Mixtures

Question 11

Total pressure of a gas mixture is equal to ___

Answer 11

The sum of individual gas pressures

Question 12

In WET GAS= DRY GAS + WATER VAPOR, the variables must describe that certain gas in ____

Answer 12

n=PV/RT

Question 13

The answer to a mole fraction is a decimal representing the ___ of the total number of ___________.

Answer 13

Percent, moles

Question 14

the movement of a substance from HIGH to LOW

Answer 14

Diffusion

Question 15

Movement of a substance from HIGH to LOW through a membrane (tiny openings)

Answer 15

Effusion

Question 16

In Graham’s law, make gas 1 the ____ gas

Answer 16

Lighter

Question 17

In Graham’s law, always remember that gases can be _______

Answer 17

Diatomic

Question 18

What is Henry’s law

Answer 18

The amount of gas that will dissolve in a liquid at a given temperature varies directly with the pressure above the liquid

Question 19

Why do divers take precautions with solubility of gasses and temperature

Answer 19

As the temperature increases, the solubility of a gas decreases
So, they avoid taking hot showers so no gaseous bubbles form in the bloodstream inside the body

Question 20

If a temperature increases by 15 Celsius, do you change the T or leave it C

Answer 20

Leave it

Question 21

If you are trying to find something at STP, what do you use for your second equations

Answer 21

The constant for each variable

273 K, 1 atm, etc

Question 22

Actual pressure=_________+_________

Answer 22

Gauge pressure, atmospheric pressure