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chemistry examination
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Lecture notes of 9 pages for the course General Chemistry I at Unisa (will help)
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lOMoARcPSD|23479258Chemistry practice exam v2
Organic Chemistry (University of Lagos)
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Downloaded by Athi (athidikana@gmail.com)
, lOMoARcPSD|23479258
Chemistry Practice Exam v2
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 plagiarism can 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:
Temperature (⁰C) Pressure (mm of Hg)
10 726
20 750
40 800
70 880
100 960
150 1085
Fill in the missing data point. Show all calculations leading to an answer.
The General Law of Gases states that
P1*V1/T1 = P2*V2/T2.
As Volume is constant, we can write this as
P1/T1 = P2/T2,
P1 and T1 are the pressure and temperature at time 1.
P2 and T2 are the pressure and temperature at time 2.
You can take any pair of values as P1 and T1 and find P2 = P1T2/T1, once you sum 273.15 to each
temperature to get kelvins.
P1 = 726 mm Hg
T1 = 10 + 273.15 = 283.15 K;
T2 = 150 + 273.15 = 423.15 K.
Then, P2 = 726 * 423.15/283.15 = 1085.96 mm Hg.
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.
Downloaded by Athi (athidikana@gmail.com)
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