Chemistry Final Exam
Directions:It is important that you provide answers in your own words. Please focus only on
information from the text/eBook to create your own solutions. Please do not use direct information
from an outside source (especially copying and pasting from an “answer” website). Use of direct
information from an outside source is against school policy. All answers will be checked for plagiarism.
Instances of plagiarismcan result in probation or possible dismissal from the school.
Please be sure to follow all guidelines (number of sentences/showing all calculations) and to provide the
correct metric units of measure. All questions are 3.33 points each (.33 for unit)
1. A student collected the following data for a fixed volume of gas:
Pressure (mm of Hg)
Fill in the missing data point. Show all calculations leading to an answer.
2. You are given a clear solution of KNO3. Using 3 – 4 sentences (in your own words) explain how
you would determine if the solution is unsaturated, saturated or supersaturated.
If I add more KNO3 in the solution and it dissolve, it is unsaturated solution but if it does not
dissolve in the solution, then it is saturated. If the solution contain more of KNO3 than it could
be dissolved by the solvent then it is supersaturated.
3. Explain why gasoline will not dissolve in water.
4. Explain in 3 – 4 sentences (in your own words) how perspiration helps keep you cool on a hot
Gasoline is not soluble in water. Gasoline is a mixture of non polar compound while water is a
Polar molecule. For this reason, Gasoline molecules can not enter water and form solution.
5. You have two sealed jars of water at the same temperature. In the first jar there is a large
amount of water. In the second jar there is a small amount of water. Using 3 -4 sentences
explain how the vapor pressure of water in the first jar compares with the vapor pressure of
water in the second jar.
The vapor pressure of water is the pressure at which water vapor is in thermodynamic
equilibrium with its condensed state. Vapor pressure varies with temperature. The vapor
pressure of water in the two Jar will be the same since they are of the same temperature.
6. Using 3 – 4 sentences explain (in your own words) why water expands when it freezes?
Water expands when it freezes becaus...