Learning Modules 37-42

Which of the following statements about state functions is true?

• State functions describe quantitative values of a system at equilibrium.

• State functions are path dependent.

• As a system undergoes changes the value of a state function must increase.

• The state functions associated with the ideal gas law are P, V, T and R.

Tags

NGSS.HS-PS3-4

In a system of gas, if we double the temperature what happens to the energy of the
particles?

• The energy doubles.

• The energy stays the same.

• The energy halves.

• The energy quadruples.

Tags

NGSS.HS-PS3-4

Which of the following would increase the rate of effusion of a gas?

• Increasing the temperature

• Decreasing the temperature

• Increasing the size of the gas particles

• None of these answers

Determine the partial pressure of oxygen collected by water displacement if the water
temperature is 20.0°C and the total pressure of the gases in the collection bottle is 678
torr. PH2O at 20.0°C is equal to 17.5 torr.

• 661 torr

• 562 torr

• 696 torr

• 712 torr

HF is a corrosive gas. At 2.0 atm and 300 K, HF occupies a 4.50 L volume. How many
grams of HF are in the volume?

• 7.3 g

• 0.573 g

• 15.6 g

• 2.74 g

Determine the molecular weight of a compound given the gas phase data: mass of
27.64 g, temperature of 18.4°C, pressure of 956 torr, volume of 14.32 L.

• 36.7 g/mol

• 191 g/mol

• 279 g/mol

• 24.9 g/mol

For the reaction
2 HCl + Na2CO3 → 2 NaCl + H2O + CO2
179.2 liters of CO2 is collected at STP. How many moles of NaCl are also formed?

• 16.0 moles
  

• 32.0 moles

• 12.5 moles

• 8.0 moles

Real gases and vapors have intermolecular interactions. Recall that the van der Walls
equation is expressed in terms of two parameters a and b. Which of H2CO or CH4 has
the larger van der Walls parameter a?

• H2CO

• CH4

• They are the same

• Neither

Real gases behave most nearly like ideal gases at

• high temperatures and low pressures.

• high pressures and low molar masses.

• high temperatures and high pressures.

• low temperatures and low pressures.