Gas Laws 1
Why does pumping air into a tire at a constant temperature increase the tire pressure?
Because the number of molecules increases
Which gas law has the assumptions of a fixed amount and temperature of a gas?
Boyle's Law: Pressure and Volume
What is supposed to happen to the molecule of matter at Absolute Zero?
They completely stop moving
Based on Graham's Law of Effusion, which gas will effuse the fastest if you have O2 = 32g/mol and N2 =28g/mol
Nitrogen because it has a smaller molar mass.
What are the two types of solids?
Crystalline and Amorphous
What is Gay-Lussac's Equation?
P1/T1 = P2/T2
Which gas law has the assumptions of a fixed amount and volume of a gas?
Gay-Lussac's Law: Pressure and Temperature
The sum of all partial pressures of the gases present.
Above which point on a phase diagram can you no longer distinguish between a liquid and a gas?
The Critical Point
What property of liquids allows insects to walk on water?
Surface tension
If three antiacid tablets produce 600 cm3 of gas, how much would 5 produce?
600/3 = 200 for each tablet
5 x 200 = 1000 cm3
If a liquid has a temperature of 87 °C, what is it in kelvin?
K = °C + 273
87 +273 = 360 K
The average speeds of gas molecules in cylinders A, B, C, and D are 0.001 m/s, 0.05 m/s, 0.1 m/s, and 0.0005 m/s respectively.
Which cylinder contains gas that is closest to absolute zero?
D
At which point on a phase diagram do you have a solid, a liquid, and a gas simultaneously?
Triple Point
Which liquid is the most viscous?
A. Hot Water
B. Ethyl alcohol at room temperature
C. Hot maple Syrup
D. Honey at room temperature
Honey at room temperature
Consider a gas at STP in a container of 44.8 L.
What is the approximate value of n according to the ideal gas law?
1 mole in 22.4L
So, in a container of 44.8 L, you will have 2 moles
In the equation PV=nRT, what does the n stand for?
moles
You have three gases in a mixture where P1 = 100 kPa, P2 = 50 kPa, and P3 = 65 kPa. What is the total pressure of the gas mixture?
100 + 50 + 65 = 215 kPa
When is intermolecular forces the strongest?
When the molecules are close together.
Which solid conducts electricity most efficiently?
A. Sugar
B. Graphite
C. Sodium Chloride
D. Silver
Silver
If you put a balloon in hot water, it will get bigger. Describe what will happen to the molecules for this to occur? Which gas law explains this?
The molecules will expand and become faster making the balloon expand. Charles's law explains this because his law deals with Temperature and Volume.
You have three fixed volume containers at STP.
Container A 0.5 mole of gas in 11.2 L
Container B 2 mole of gas in 22.4 L
Container C 1 mole of gas in 22.4 L
Which two containers have equal pressure?
A and C
If the total pressure of a gas is 2500 kPa, when 35% of it is Oxygen. What is the partial pressure of Oxygen?
2500 x 0.35 = 875 kPa
The three main gases in air are Nitrogen (N2), Oxygen (O2) and argon (Ar). Which of these gases will diffuse fastest? Which will diffuse slowest?
N2 - 28g/mol / O2 = 32 g/mol / Ar = 40 g/mol
Nitrogen diffuses fastest and Argon diffuses slowest
If you raise the pressure of a liquid, what happens to the boiling point?
It increases, because it takes more KE for the molecules to break free of the intermolecular forces.