Gas Laws

Front

In an ideal gas, if everything else is held constant, doubling the volume will ________ the pressure.

Back

halve

Answer explanation

$PV=nRT$

Since nRT cannot change, neither can PV. If you multiply V by 2, you would have to multiply P by 1/2 to keep the right side constant.

Front

In an ideal gas, if everything else is held constant, tripling the pressure will ________ the Kelvin temperature.

Back

triple

Answer explanation

$PV=nRT$

If you multiply P by 3, you would have to multiply T by 3 as well in order to keep the right side equal to the left.

Front

Back

Front

You stand at the end of a long hallway. At the other end, your classmate releases equal amounts of two gases, carbon-dioxide and chlorine. Which one reaches you first?

Back

CO₂

Answer explanation

Lighter gases diffuse faster.

Front

According to kinetic molecular theory: at constant temperature, increasing the volume will decrease the pressure because...

Back

the gas particles must travel farther from wall to wall.

Answer explanation

farther travel = fewer collisions per second

In kinetic molecular theory:

pressure = collisions per second between gas and walls of container

temperature = average kinetic energy of gas molecules (as measured by temperature)

Front

According to kinetic molecular theory: at constant volume, increasing the temperature will increase the pressure because...

Back

the gas particles are moving faster; faster = more collisions-per-second.

Answer explanation

increased temp = increased kinetic energy

In kinetic molecular theory:

pressure = collisions per second between gas and walls of container

temperature = average kinetic energy of gas molecules (as measured by temperature

Front

The pressure of a gas at 22 °C goes from 3 atm to 6 atm, with volume held constant. What is its new temperature?

Back

317 °C

Answer explanation

The Kelvin temperature doubles.

22 °C = 295 K

295*2 = 590

590 – 273 = 317 °C

Front

According to kinetic molecular theory, more moles of gas means more pressure at the same volume and temperature because...

Back

more moles = more collisions

Front

If no air is added and no air escapes, the tires on a car are flatter in winter than in summer.

Back

True

Answer explanation

$PV=nRT$

Decrease in T results in a decrease in P if all else is held constant.

Front

What does STP stand for?

Back

standard temperature pressure, standard temperature & pressure, standard temperature and pressure