CHEM121 CHAPTER 10 EXAM
QUESTIONS AND REVIEWED ANSWERS
compressibility
measure of how much the volume of matter decreases
under pressure
Why are gases easier to compress than solids or
liquids are?
gases are easily compressed because the space between
the particles in a gas
what are 3 factors that affect gas pressure?
1. amount of gas
2. temperature
3. volume
Boyle's Law
states that for a given mass of gas at constant
temperature, the volume of the gas varies inversely with
pressure. P₁ x V₁ = P₂ x V₂
Charles's Law
states that the volume of a fixed mass of gas is directly
proportional to its Kelvin temperature if the pressure is
kept constant. V₁÷T₁ = V₂÷T₂
Gay-Lussac's Law
states that the pressure of a gas is directly proportional to
the Kelvin temperature if the volume remains constant.
P₁÷T₁ = P₂÷T₂
combined gas law
, describes the relationship among the pressure,
temperature, and volume of an enclosed gas.
P₁ x V₁÷T₁ = P₂ x V₂÷T₂
How are pressure, volume and temperature of a gas
related?
If temperature is constant, as the pressure of a gas
increases, the volume decreases. As the temperature of
an enclosed gas increases, the volume increases, if the
pressure is constant. As the temperature of an enclosed
gas increases, the pressure increases, if the volume is
constant
When is the combined gas law used to solve
problems?
The combined gas law allows you to do calculation for
situations in which only the amount of gas is constant
ideal gas constant
R = 8. 31 (L × kPa)÷(K × mol)
ideal gas law
gas law that includes all four variables: P, V, T and n.
PV = nRT
What is needed to calculate the amount of gas in a
sample at given conditions of volume, temperature
and pressure?
To calculate the number of moles of a contained gas
requires an expression that contains the variable: n
Under what conditions are real gases most likely to
differ from ideal gases?
Real gases differ most from an ideal gas at low
temperatures and high pressures
partial pressure
QUESTIONS AND REVIEWED ANSWERS
compressibility
measure of how much the volume of matter decreases
under pressure
Why are gases easier to compress than solids or
liquids are?
gases are easily compressed because the space between
the particles in a gas
what are 3 factors that affect gas pressure?
1. amount of gas
2. temperature
3. volume
Boyle's Law
states that for a given mass of gas at constant
temperature, the volume of the gas varies inversely with
pressure. P₁ x V₁ = P₂ x V₂
Charles's Law
states that the volume of a fixed mass of gas is directly
proportional to its Kelvin temperature if the pressure is
kept constant. V₁÷T₁ = V₂÷T₂
Gay-Lussac's Law
states that the pressure of a gas is directly proportional to
the Kelvin temperature if the volume remains constant.
P₁÷T₁ = P₂÷T₂
combined gas law
, describes the relationship among the pressure,
temperature, and volume of an enclosed gas.
P₁ x V₁÷T₁ = P₂ x V₂÷T₂
How are pressure, volume and temperature of a gas
related?
If temperature is constant, as the pressure of a gas
increases, the volume decreases. As the temperature of
an enclosed gas increases, the volume increases, if the
pressure is constant. As the temperature of an enclosed
gas increases, the pressure increases, if the volume is
constant
When is the combined gas law used to solve
problems?
The combined gas law allows you to do calculation for
situations in which only the amount of gas is constant
ideal gas constant
R = 8. 31 (L × kPa)÷(K × mol)
ideal gas law
gas law that includes all four variables: P, V, T and n.
PV = nRT
What is needed to calculate the amount of gas in a
sample at given conditions of volume, temperature
and pressure?
To calculate the number of moles of a contained gas
requires an expression that contains the variable: n
Under what conditions are real gases most likely to
differ from ideal gases?
Real gases differ most from an ideal gas at low
temperatures and high pressures
partial pressure
