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Chemistry Final Exam Version 12/2016 Name: Student number: 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 ??? 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. 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 day. 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. 6. Using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. Using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. Use 3 – 4 sentences in your explanation. 8. When a 2.5 mol of sugar (C12H22O11) are added to a certain amount of water the boiling point is raised by 1 Celsius degree. If 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? Show all calculations leading to your answer OR use 3 – 4 sentences to explain your answer. 9. If 5.40 kcal of heat is added to 1.00 kg of water at 100⁰C, how much steam at 100⁰C is produced? Show all calculations leading to an answer. 10. The freezing of water at 0⁰C can be represented as follows: H2O (l) ↔ H2O(s) 3 The density of liquid water is 1.00 g/cm . The density of ice is 0.92 g/cm3. In 3 – 4 sentences explain why applying pressure causes ice to melt. 11. The Kw of water varies with temperature. Calculate the pH of water at 46⁰C with a Kw = 1.219 x 10-14. Show all calculations leading to an answer. 12. Calculate the hydroxide ion concentration of a solution with pH = 3.25. Show all calculations leading to an answer. 13. What salt results from the neutralization of phosphoric acid with potassium hydroxide? 14. What is the oxidation number of chlorine in Al(ClO4)3? 15. Which element is oxidized in the following reaction: CuO(s) + H2 (g)  Cu(s) + H2O (l) 16. Why must the number of electrons lost equal the number of electrons gained in every redox reaction? Use 3 – 4 sentences in your own words to address this question. 17. The following unbalanced equation describes the reaction that can occur when lead (II) sulfide reacts with oxygen gas to produce lead (II) oxide and sulfur dioxide gas: PbS + O2  PbO + SO2 Balance the equation and describe in words the electron transfer(s) that takes place. 18. What type of radiation is emitted when chromium-51 decays into manganese-51? Show the nuclear equation that leads you to this answer. 19. A radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. What was the identity of the original nucleus? Show the nuclear equation that leads you to this answer. 20. Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Show all calculations leading to a solution. 21. Using at least 3 to 4 complete content related sentences, explain how the compressed gas in an aerosol can forces paint out of the can. Be sure to describe how the gas pressure inside the can changes as the paint is sprayed. Please refer to figure 14.5 in lesson 14.1. 22. pH is a measure of ______________. a. hydrogen ion concentration. b. hydrogen gas concentration. c. hydroxide ion concentration. d. hydrolysis. 23. A neutralization reaction between an acid and a base always produces a. salt and acidic anhydride. c. water and basic anhydride. b. salt and basic anhydride. d. salt and water. 24. If the pH of a solution is _____ the solution is basic. a. 2 b. 5 c. 7 d. 10 25 – 30 Apply the appropriate word to the definition indicated. Not all words will be used. 25. _____ 26. _____ 27. _____ 28. _____ 29. _____ 30. _____ Heat content of a system at constant pressure Ability to do work Disorder Energy of motion Study of energy changes that ocrrue during chemic reaction and changes in states. Amount of heat required to raise T of 1 g of pure water 1◦C calorie (cal) Chemical Potential Energy Energy Enthalpy Entropy Joule Kinetic energy Heat (q) Specific Heat Thermochemistry

Tutor Answer

marcel111
School: UCLA

Attached.

Chemistry Final Exam

Version 12/2016

Name:
Student number:

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:
Temperature (⁰C)
Pressure (mm of Hg)
10
726
20
750
40
800
70
880
100
960
150
1090
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
day.
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...

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