Graphing Practice Problem #2 The volume of a gas decreases as the temperature of the gas decreases. A sample of gas was collected at 100 degrees Celsius and then cooled. The changes in the volume of the sample are shown below. T (*C) V (ml) 100 320 80 297 60 288 40 278 30 252 20 243 10 236 0 233 -10 227 -30 202
Ideal and Real Gases
Ideal gases obey conditions of the general gas laws under all states of pressure and temperature. Ideal gases are also named perfect gases. The attributes of ideal gases are as follows,
Gas Laws
Gas laws describe the ways in which volume, temperature, pressure, and other conditions correlate when matter is in a gaseous state. The very first observations about the physical properties of gases was made by Robert Boyle in 1662. Later discoveries were made by Charles, Gay-Lussac, Avogadro, and others. Eventually, these observations were combined to produce the ideal gas law.
Gaseous State
It is well known that matter exists in different forms in our surroundings. There are five known states of matter, such as solids, gases, liquids, plasma and Bose-Einstein condensate. The last two are known newly in the recent days. Thus, the detailed forms of matter studied are solids, gases and liquids. The best example of a substance that is present in different states is water. It is solid ice, gaseous vapor or steam and liquid water depending on the temperature and pressure conditions. This is due to the difference in the intermolecular forces and distances. The occurrence of three different phases is due to the difference in the two major forces, the force which tends to tightly hold molecules i.e., forces of attraction and the disruptive forces obtained from the thermal energy of molecules.
Graphing Practice Problem #2 The volume of a gas decreases as the temperature of the gas decreases. A sample of gas was collected at 100 degrees Celsius and then cooled. The changes in the volume of the sample are shown below.
T (*C) V (ml)
100 320
80 297
60 288
40 278
30 252
20 243
10 236
0 233
-10 227
-30 202
Start graph at -350. Start graph at 0.
A. For the data in the data table, graph the data.
NOTE: 1. Start the volume on the graph at zero and consider 1 cm = 20 ml. on the graph.
2. Start the graph at -350 *C. The graph will allow you to extrapolate (extend the graph beyond measured data) the graph to reach a gas volume of 0 ml. The temperature at which the volume of the gas reaches zero is the theoretical temperature of Absolute Zero.
B. Draw a best-fit line for the data points.
C. Find the slope of the line. Slope Equation = ________
Draw a LARGE triangle on your graph in order to find the rise & run.
From the triangle, show how you find the rise and the run for the line graph.
SHOWALL your work on the graph. Write on the graph - Slope = rise run, then put in your values for the rise and run ON YOUR GRAPH.
Find the value of the slope (in decimal form). Slope = ____________
Analysis Questions: 1. Write two slope equations: Slope = _________ = ___________
2. Write slope value with the unit: Slope = __________
3. What is the y-intercept value? _______________
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