# Graphing Gas Behavior

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Graphing Gas Behavior

Section 4

Graphs are diagrams that tell how two variables are related. Graphs show how changes in one variable results in changes in a second variable. Graphs can be used to show the relationships between volume, temperature, and pressure of gases.

A graph consists of a grid set up by two lines, one horizontal and one vertical. Each line or axis is divided into equal units. The horizontal axis, o r the x-axis, shows the manipulated variable (the variable that is changed). The vertical axis, or y-axis, shows the responding variable.

Remember, the manipulated variable is the variable that is controlled by the scientists, and the responding variable is the response to the change of the manipulated variable.

You will learn how to graph Charles’s Law (the relationship between Temperature and Volume) and Boyle’s Law (the relationship between Pressure and Volume).

During an experiment, quantitative data is recorded. Remember, data are facts, figures, and other evidence gathered through observations. Quantitative data are data that can be measured (like Temperature, Pressure, and Volume). Data will be provided for you in this worksheet.

For the test you need to be able to label a graph, and plot data points given, and answer questions about the graphs.

Graphing:

1- Start by labeling your horizontal and vertical lines.

- Horizontal line is the manipulated variable

- Vertical line is the responding variable

2- Plot the points that are given.

3- Connect the dots.

4- Interpret the graph.

Graph Charles’s Law and Boyle’s law, and then answer the questions for the graphs on a separate sheet of paper. (I will not give you credit if you do not follow the directions)

Charles’s Law

1- What is the manipulated variable?

2- What is the responding variable?

3- Did the graph make a straight line or curved line?

4- Using the line on the graph, what would be the volume be if the temperature was 100?

5- What is the relationship between temperature and volume? (when temperature increases, volume will ? and when temperature decreases, volume will ? )

Boyle’s Law

1- What is the manipulated variable?

2- What is the responding variable?

3- Did the graph make a straight line or curved line?

4- What is the relationship between pressure and volume? (when volume increases, pressure will ? and when volume decreases, pressure will ? )