AP Chemistry Test 1.3.2_.docx - AP Chemistry Test 1.3.2...

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AP Chemistry Test 1.3.2: Question 1: Behavior of Gases (12 points) a) Write 4 – 6 sentences to describe the properties that allow a gas to be treated as an ideal gas. Explain and discuss the conditions in which these properties would exist. (5 points) The properties that allow a gas to be treated as an ideal gas include its polarity and the amount of intermolecular forces it exhibits. To be viewed or treated as an ideal gas a gas should be nonpolar. A gas should also exhibit low intermolecular force levels, this relates to the gases molecular size, the smaller the molecule the less IMFs. The conditions in which these properties would exist would be high temperature and low pressure. b) The graph below describes the temperature and pressure relationship of a gas under ideal conditions. Write 2 – 3 sentences to explain the graph. Be sure to explain what will happen to the real gas behavior as the temperature of the gas is lowered. (4 points) Due to the ideal gas law (PV=nRT) both pressure and temperature are directly proportional. In accordance with the graph above as temperature decreases so will pressure, due to this decrease in temperature the gas will cease to follow ideal gas behaviors
and will eventually change states. c) Write 3 – 5 sentences to describe what happens to a can of carbonated soda when it is left in a hot car. Be sure to explain the relationship between the number of molecules, temperature, pressure, and volume. (3 points) In this scenario, the heat of the car will cause an increase to the temperature of the soda. This temperature increase will in turn increase pressure due to their direct proportionality shown in PV=nRT (The ideal gas law). The number of molecules and the volume will stay the same because it is in a closed can and nothing is being added or subtracted.

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