# Shared Flashcard Set

## Details

Exambusters Study Cards 11 Gases
Gases Cards 225-240
20
Chemistry
10/06/2012

## Additional Chemistry Flashcards

Term
 State Normal atmospheric pressure in five standard units
Definition
 1 atm 760 torr 101.3 kilopascals 14.7 lbs/square inch
Term
 definition: Pressure
Definition
 force/area
Term
 barometer
Definition
 An instrument, invented by Torricielli in 1643, which measures atmospheric pressure. An evacuated glass tube in which a column of mercury rises or falls with changing pressure.
Term
 manometer
Definition
 An instrument used to measure pressure of gases in a closed container.
Term
 State three postulates of the Kinetic-Molecular Theory of Gases
Definition
 1. Matter is composed of very small particles; a gas is mostly empty space. 2. Particles are in constant random motion. 3. Collisions are elastic.
Term
 State the formula for Graham's Law of Diffusion.
Definition
 In a mixture of gases A, B:   (RA)(MWA)1/2 = (RB)(MWB)1/2   MW = Molecular Weight R = Rate of diffusion
Term
 Do heavy or light gases diffuse faster?
Definition
 Light gases diffuse faster.
Term
 Charles' Law
Definition
 V1/T1 = V2/T2   Volume and temperature have a direct relationship when pressure and moles of gas remain constant.   V = volume T = Kelvin
Term
 Solve this problem: At 300 K, a gas has a volume of 10 liters. Find the volume at 400 K
Definition
 Use Charles' Law: V1/T1 = V2/T2 V2 = 13.3 L
Term
 Boyle's Law
Definition
 (P1)(V1) = (P2)(V2) Pressure and volume have an inverse relationship when temperature and moles of gas remain constant.   P = Pressure V = Volume
Term
 A sample of gas has a volume of 25 L at 800 torr. Find the volume at 400 torr.
Definition
 Use Boyle's law: (P1)(V1) = (P2)(V2)   V2 = 50 L
Term
 Combined Gas Law
Definition
 P1V1/T1 = P2V2/T2   Moles of gas constant P = Pressure V = Volume T = Kelvin
Term
 Dalton's Law of Partial Pressures
Definition
 In a gas mixture, the total pressure equals the sum of the partial pressures of each component.   Ptotal = P1 + P2 + P3 .....
Term
 Ideal Gas Law
Definition
 PV = nRT   P = Pressure (atmospheres) V = Volume (liters) n = # of moles R = 0.0820 (L atm)/(mol K) T = temperature in K
Term
 How many moles of H2 gas are there in 20 L at 4 atm and 400K?
Definition
 Use the Ideal Gas Law: PV = nRT   n = 2.44 moles
Term
 STP
Definition
 Standard temperature (0 C, 273 K) and standard pressure (1 atm or 760 torr)
Term
 Gay-Lussac's Law of Combining Gas Volumes
Definition
 When only gases are involved in a reaction, the volumes of reactants and products are in a small, whole number ratio.
Term
 Avagadro's Law (for gases)
Definition
 Under the same conditions of temperature and pressure, equal volumes of gases contain equal numbers of moles.
Term
 What is the volume of 1 mole of any gas at STP?
Definition
 22.4 Liters
Term
 N2 + 3H2 ↔2 NH3 In the above reaction, how many L of NH3 will be produced from 6 L of H2?
Definition
 According to Gay-Lussac's Law, the volumes of gases are in direct proportion to the coefficients in the equation.   x = 4 L of ammonia
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