12.1 and 12.2 Test Practice

If the molar mass of gas 1 is 4.0 grams per mole and the molar mass of mass 2 is 10.0 grams per mole, what is the ratio of their speeds of diffusion?

• 1.6:1

• 2.5:1

• 25:1

• 0.0253:1

Which will travel faster: oxygen gas or helium gas?

• O₂

• He

How much faster will He(g) travel than O₂(g)?

• 4 times faster

• 2.8 times faster

• 0.35 times faster

• 0.125 times faster

Lighter gases have a ________________ rate of effusion.

• faster 
• slower
• rate of effusion does not depend on mass.

why would O₂ effuse faster than CO₂ in the same room

• because O₂ has more energy

• because CO₂ has a greater molar mass

• because oxygen has a higher temperature

• they will effuse the same because the temperature is fixed

The pressure of a mixture of nitrogen, carbon dioxide, and oxygen is 300 kPa.
What is the partial pressure of oxygen is the partial pressures of the nitrogen and carbon dioxide are 200 kPa and 48 kPa, respectively. _{(That means, in that order)}

• 52 kPa

• 218 kPa

• 26 kPa

• 148 kPa

The more energy that particles have, the ___ they move.

• slower

• faster

Tags

NGSS.HS-PS3-2

Collisions in which particles don't transfer their kinetic energy are called ___.

• elastic

• inelastic

A tank of gas contains 50 kPa of helium, 50 kPa of argon, and 100 kPa of neon. What is the total pressure of the gas mixture?

• 100 kPa

• 50 kPa

• 200 L

• 200 kPa

Which type of intermolecular force is the weakest?

• Hydrogen bonding

• London dispersion force

• Ionic bond

• Dipole-dipole force