Gas Variables POGIL Only

Gas Variables POGIL

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Open Ended

In Model 1, what does a dot represent? (Click the photo to enlarge it)

Open Ended

Name two materials the containers in Model 1 could be made of that would be "nonflexible".

Multiple Choice

In Model 1, the length of the arrows represents the average kinetic energy of the molecules in that sample. Which gas variable (P_internal, V, T or n) is most closely related to the length of the arrows in Model 1?

• P

• V

• T

• n

Open Ended

For experiment A, what is the dependent variable? Remember, this is the variable that responds to the changes that a scientist makes to the independent variable.

Open Ended

For experiment A, what is the independent variable? Remember, this is the variable that a scientist changes.

Open Ended

For experiment B, what is the dependent variable? Remember, this is the variable that responds to the changes that a scientist makes to the independent variable.

Open Ended

For experiment B, what is the independent variable? Remember, this is the variable that a scientist changes.

Multiple Choice

If a container is nonflexible, what variable will be held constant?

• P

• V

• n

• T

Read This

Pressure is caused by molecules hitting the sides of a container or other objects. The pressure changes when the molecules change how often or how hard they hit. A nonflexible container is needed if the gas sample is going to have an internal pressure that is different from the external pressure. If a flexible container is used, the internal pressure and external pressure will always be the same because they are both pushing on the sides of the container equally. If either the internal or external pressure changes, the flexible container walls will adjust in size until the pressures are equal again.

Open Ended

According to what you just read, name the two factors related to molecular movement that influence the pressure of a gas.

Open Ended

What do you think is happening at the molecular-level to cause the increase in pressure observed among the flasks of Experiment A.

Open Ended

What do you think is happening at the molecular-level to cause the increase in pressure observed among the flasks of Experiment B.

Multiple Choice

Predict what would happen to the volume and internal pressure in Experiment A of Model 1 if a flexible container were used.

• It would increase

• It would decrease

• It would stay the same

Multiple Choice

Predict what would happen to the volume and internal pressure in Experiment B of Model 1 if a flexible container were used.

• It would increase

• It would decrease

• It would stay the same

Review "Quiz"

Multiple Choice

A high-temperature gas is compared to the same gas at lower temperature. Which of the following statements is true?

• Every molecule in the high-temperature gas is moving faster than every molecule in the low-temperature gas.

• The average molecular speed in the high-temperature gas is faster than the average molecular speed in the low temperature gas.

• Both A and B are true.

• Neither A nor B is true.

Multiple Choice

What Celsius temperature is closest to 431 K?

• 160 C

• 250 C

• 450 C

• 700 C

Multiple Choice

A sample of gas has a pressure of 150 kPa. If Ms. Keeler increases the volume of the container, what would happen to the pressure?

• It would increase

• It would decrease

• Nothing