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CHEM 219 Exam # 3 Questions And Correct Answers
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CHEM 219 Exam # 3 Questions And Correct AnswersAvogadro's Law - Answer equal volumes of gases at the same temperature and
pressure contain equal numbers of molecules
Boyle's Law - Answer Boyle's Law states that at constant temperature and moles,
pressure and volume are inversely proportional.
Mathematically this is written as: PV = PV
Charles' Law - Statement of the law that states at a constant amount of gas held at
constant pressure, the volume of the gas increases with an increase in the temperature
of the gas and the volume of the gas decreases with a decrease in the temperature of
the gas
Gay-Lussac's Law - statement of the pressure of a gas is directly proportional to the
Kelvin temperature if volume is constant
Combined Gas Law - The relationship between the pressure volume and temperature of
a fixed amount of gas can be answered
Ideal Gas Law - PV=nRT
R=.0821
If 5.00 g of Gas A and 5.00 g of Gas B are mixed in the same container and the partial
pressure of Gas B is found to be twice that of Gas A, what do we know about the gases?
- Answer If Gas A has half the partial pressure of Gas B, this means there are less moles
of it given the same mass, so Gas A has twice the molar mass of Gas B
mol fraction and partial pressure - Answer the equation for both
, Amonton's Law - Answer if volume of a gas is kept constant, increasing the Temperature
of the gas increases its pressure.
Boyle's Law
in terms of KE - Answer Volume went down, wall area went down equalled higher
pressure
Avagadro's Law
in terms of KE - Answer Container pressure remained constant, added more gas
molecules equalled higher volume
Dalton's Law - Answer Total pressure of a mixture of gases is the sum of the individual
pressures. (Ptotal=P1+P2+P3.)
The kinetic energy of a particle of mass, m, and speed, u, is given as - Answer KE = 1/2
mu^2
The average KE of a group of gas molecules is also directly proportional to the
temperature of a gas and can be defined as - Answer KEavg = 3/2 RT
Kinetic Molecular Theory - Answer The theory of Kinetic Molecular states that:
⋅⋅There is no attraction between the gas particles.
⋅⋅ The volume available to the gas particles is the volume of the container.
⋅⋅ The pressure measured is due to the collisions of the gas particles with the container
walls.
⋅⋅ The average kinetic energy is related to the temperature of the system.
Which of the following gas samples have the greatest average molecular speed at 25°C?
- Solution Speed of individual gas molecules is inversely proportional to the molar mass.
CH₄ has a molar mass of just over 16 g/mol and is the smallest of the gases listed.
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