# Gases

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• Created by: LZ95
• Created on: 06-05-14 19:00
What is Brownian motion?
Smoke particles can be seen as tiny specks of light wriggling randomly when a beam of light is directed through the smoke.
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What is the Avogrado constant (Na)?
Number of atoms in exactly 12g of the carbon isotope 12,6C
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Define the atomic unit mass
1/12th of the mass of a 12,6C atom
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What is one mole of a substance?
Quantity of substance that contains Na particles
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What is molar mass?
Mass of one mole of the substance
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How would you find the number of moles in a substance?
Ms/M where Ms = mass of substance and M=molar mass
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How would you find the number of molecules in a substance?
NaMs/M
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What is an ideal gas?
A gas that obeys Boyle's law
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What is Boyle's law in words?
The gas pressure X its volume is constant for a fixed mass of gas at a constant temperature
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What is Charles' law in words?
The volume of a fixed mass of an ideal gas at a constant pressure is proportional to its absolute temperature.
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What is the pressure law in words?
The pressure of a fixed mass of an ideal gas at constant volume is proportional to its absolute temperature
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What is the equation for an ideal gas?
pV=nRT
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For an ideal gas, what is the relationship between its density and its temperature?
Density is inversely proportional to temperature T
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What is the Boltzmann constant (k)?
Molar gas constant divided by the Avogrado constant (R/Na)
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Name 5 assumptions that are made in the kinetic theory model?
Molecules have negligible volume to that of the gas; they do not attract each other; move randomly; undergo elastic collisions; time spent colliding with container
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What is the relationship between the temperature of a gas and the mean kinetic energy of a molecule of a gas?
Higher temperature = higher kinetic energy
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What equation can help in questions where the gas has changed volume/temperature/pressure?
P1V1/T1 = P2V2/T2
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## Other cards in this set

### Card 2

#### Front

What is the Avogrado constant (Na)?

#### Back

Number of atoms in exactly 12g of the carbon isotope 12,6C

### Card 3

#### Front

Define the atomic unit mass

### Card 4

#### Front

What is one mole of a substance?

### Card 5

#### Front

What is molar mass?