AP Chapter 5 gases

The pressure and temperature of a sample of gas are ___ related.

• directly

• inversely

• not

What are the values for STP?

• 0 K and 1 atm
• 0^oC and 1 atm
• 760 K and 1 atm
• 273^oC and 1 atm

What is the pressure in a container that has 3 atm H_2, 2 atm of N₂ and 5 atm of F₂?

• 2 atm

• 3 atm

• 5 atm

• 10 atm

Find the density of neon gas at 0.725 atm and 25°C [M_m =20.18]

• 0.35

• 0.47

• 0.60

• 0.79

The conditions under which real gases most resemble ideal gases are 

• low pressure & high temperature
• low pressure & low temperature
• high pressure & high temperature
• high pressure & low temperature

A gas sample is held at constant pressure. The gas occupies 3.62 L of volume when the temperature is 21.6°C. Determine the temperature at which the volume of the gas is 3.42 L.

• 312K

• 278K

• 20.4K

• 295K

• 552K

According to kinetic molecular theory, in which of the following gases will the root mean square speed of the molecules be the highest at 200ºC?

• SF₆

• H₂O

• HCl

• Cl₂

• None, the molecules of all gases have the same root mean square speed at any given temperature.

1.00 mole of He was placed in each flask. Which statement is true?

• Since all flask have same amount of gas, flask 1 has the least pressure

• Since all flask have same amount of gas, flask 2 has the least pressure

• Since all flask have same amount of gas, flask 3 has the least pressure

• Since all flask have same amount of gas, flask 4 has the least pressure

When a sample of oxygen gas in a closed container of constant volume is heated until its temperature is doubled, which of the following is also doubled?

• The density of the gas

• The pressure of the gas

• The average velocity of the gas molecules

• The potential energy of the molecules

The reaction between NO_(g) and O_2(g) to produce NO_2(g) in a rigid reaction vessel is represented in the diagram above. The pressure inside the container is recorded using a pressure gauge. Which of the following statements correctly predicts the change in pressure as the reaction goes to completion at constant temperature, and provides the correct explanation?

• The pressure will increase because the product molecules have a greater mass than either of the reactant molecules.

• The pressure will decrease because there are fewer molecules of product than of reactants.

• The pressure will not change because the total mass of the product molecules is the same as the total mass of the reactant molecules.

Tags

NGSS.HS-PS2-1