Name:______Date:______Per:______

Pressure of a Gas Virtual Lab: 24 Points

DUE:______

Background:What factors influence the pressure of a gas in a container? Gas is one of the states of matter. Gases expand or contract to fill the space available to them and can be squeezed into a smaller space. A gas has neither a definite shape nor a definite volume. Gases consist of billions of tiny particles. When a gas is contained, these particles are constantly colliding and exerting pressure on the container. Pressure is the amount of force exerted per unit of area: P = F/A. The pascal (Pa) is the standard unit of pressure. Because this unit is so small, most pressures are given in kilopascals (kPa).

In the Virtual Lab, you will explore how temperature and volume of a gas relate to pressure. The activity will help you investigate the changes in pressure of an ideal gas when temperature is changed. You will also investigate the changes in pressure of an ideal gas when volume is changed.

Objectives:Explain how the pressure in a container of gas is affected when the volume is changed.Explain the relationship between the temperature and pressure of a gas.

Procedure:

  1. Google “glencoe virtual lab pressure” and click the first link. The Temperature button is selected when the screen opens. The heat source in the activity controls temperature to a constant value.
  2. Click the Low, Medium, or High button to select a thermostat setting.
  3. Make a prediction about how increased temperature will change pressure.
  4. Record the changes in pressure as the temperature is changed in your data table 1.
  5. Click the Volume button.Make a prediction about how increased volume will change pressure.
  6. Click and drag the plunger to change the volume of the container. KEEP TEMPERATURE CONSTANT (at low, medium, or high).
  7. Record the changes in pressure as the volume is changed in data table 2.
  8. Answer the analysis questions.

Predict 1pt: How will increased temperature change pressure?

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Data Table 1 (keep volume constant, change temperature): 6pts

Predict 1pt: How will increased volume change pressure?

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Data Table 2 (keep temperature constant, change volume): 6pts

Analysis Questions 10pts:

  1. How do changes in temperature affect pressure when the volume in a container remains constant? Explain, citing evidence from your data table.

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  1. How do changes in volume affect pressure inside a container when temperature remains constant?Explain, citing evidence from your data table.

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