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CHEM 219 Exam # 3 questions and answers verified answers||Latest 2024/2025
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CHEM 219 Exam # 3 questions and answers verified answers||Latest 2024/2025
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CHEM 219 Exam # 3Avogadro's Law - ANSequal volumes of gases at the same temperature and pressure contain
equal numbers of molecules
Boyle's Law - ANSBoyle's Law states that at constant temperature and moles, pressure and
volume are inversely proportional.
Mathematically this is written as: PV = PV
Charles' Law - ANSthe law that states that for a fixed amount of gas at a constant pressure, the
volume of the gas increases as the temperature of the gas increases and the volume of the gas
decreases as the temperature of the gas decreases
Gay-Lussac's Law - ANSthe pressure of a gas is directly proportional to the Kelvin temperature
if the volume is constant
Combined Gas Law - ANSthe relationship between the pressure, volume, and temperature of a
fixed amount of gas
Ideal Gas Law - ANSPV=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 determined to be twice that of Gas A, what do we know about the gases? - ANSIf
Gas A has half the partial pressure of Gas B, this indicates that there are fewer moles of it at the
same mass, and therefore Gas A has twice the molar mass of Gas B
mol fraction and partial pressure - ANSthe formula for both
Amonton's Law - ANSif the volume of a gas is held constant, increasing the temperature of the
gas increases its pressure.
Boyle's Law
in terms of KE - ANSVolume decreased, wall area decreased = increased pressure
Avagadro's Law
in terms of KE - ANSContainer pressure constant, more gas molecules added = increased
volume
Dalton's Law - ANSThe total pressure of a mixture of gases is the sum of the individual
pressures (Ptotal=P1+P2+P3...)
, The kinetic energy (KE) of a particle of mass (m) and speed (u) is given by - ANSKE = 1/2 mu^2
The KE avg of a collection of gas molecules is also directly proportional to the temperature of
the gas and may be described by the equation - ANSKEavg = 3/2 RT
Kinetic Molecular Theory - ANSThe Kinetic Molecular Theory states:
⋅⋅There is no attraction between the gas particles.
⋅⋅The volume available to the gas particles is equal to the volume of the container.
⋅⋅The measured pressure is from collisions of the gas particles with the walls of the container.
⋅⋅The average kinetic energy is proportional to the temperature of the system.
Which of the following gas samples have the greatest average molecular speed at 25°C? -
ANSSpeed 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. Therefore it has the
fastest molecular speed.
What is the difference between effusion and diffusion? - ANSEffusion is through a pinhole, and
diffusion is through open space.
Under what conditions are gases most likely to behave ideally? - ANSGases are more likely to
behave as ideal gases at low pressures and high temperatures. Particles are moving faster and
are farther apart, therefore they are less likely to interact with each other
A solution is an example of - ANSA solution is defined as a homogeneous mixture.
The phrase 'like dissolves like' refers to - ANS"Like dissolves like" refers to the fact that polar
molecules dissolve polar molecules, which both have polar and perhaps hydrogen bonding
intermolecular forces, while nonpolar molecules dissolve nonpolar molecules, which generally
only have dispersion intermolecular forces.
Which of the following factors affect the solubility of a gas in a liquid solvent?
l. Pressure
II. Temperature
III. Identity of gas - ANSThe solubility of a gas in a liquid solvent is dependent on the nature of
the gas, the temperature and the pressure. Generally, the solubility of a gas in a liquid solvent
increases with lower temperatures and high pressure.
Forming solution A from liquid B and liquid C is endothermic. Increasing the pressure above the
solution will - ANSSince the solution does not contain any gases, and since liquids are
incompressible, then a change in pressure will have no effect on the solution process.
Which of the following statements is true about the solubility of N₂ (g) in CH₃OH (l)? -
ANSHenry's Law states that the higher the partial pressure of the gas, the more soluble it will be
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