CHEM Gas Laws Review

As water starts to freeze, the molecules of water

• gain thermal energy

• move more freely

• increase in size

• decrease in speed

Which of the following will most likely happen to a helium–filled balloon when left in a freezer for two hours?

• volume will increase

• balloon will explode

• helium atoms will slow down and move closer together

• No change

According to kinetic molecular theory, as the temperature of a confined gas rises, which of the following characteristics of the gas molecules increases?

• density

• number

• size

• average speed

Which statement describes the particles of an ideal gas based on the kinetic molecular theory?

• The gas particles have attractive forces between them

• the gas particles are in constant, nonlinear motion

• the gas particles are relatively far apart and have negligible volume

• the gas particles have collisions without transferring energy

An assumption of the kinetic theory of gases is that the particles of a gas have --

• strong attraction for each other and significant volume

• little attraction for each other and significant volume

• little attraction for each other and insignificant volume

• strong attraction for each other and insignificant volume

As the valve opens, the gas particles move toward the empty container. Which statement best describes the behavior of this gas?

• A magnetic field in the empty container pulls the particles

• Random movement of the gas particles causes the particles to move into the empty container

• changes in the temperature of the container cause the gas particles to expand into the empty container

• opposite electrical charges on the gas particles push them away from each other, moving them into the empty container

What happens to an object at 0 degrees Kelvin (absolute 0)?

• the object implodes and becomes a mini black hole

• the object disappears because objects must be above absolute zero to reflect light

• all kinetic motion of molecules would cease. This state is unobtainable in practice

• At absolute zero an object could no longer conduct electricity

As the temperature of a gas increases at constant pressure, the volume of the gas....

• remains the same

• increases, then decreases

• increases

• decreases

Which of these is NOT at STP?

• 0^o C , 760 mmHg

• 273 K, 1 atm

• 0^o C, 0 atm

• 273 K, 101.3 kPa