Chapter 2 : Measurement and Problem Solving a,c,d a & d 56 c & d 60 b & d c & d 70 c & d

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1 SUGGESTED HOMEWORK PROBLEMS Tro (2nd edition) Suggeted homework problems are listed below. Homework problems are located at the end of each chapter. The answers to these problems will be discussed in Problem Session. Note that some homework assignments below include Additional Exercises written by your instructor, and these should be answered also. You should work these assigned problems in the order listed in this document so that it reflects the topic order from lecture. The day prior to your scheduled Problem Session each week, you will have a general idea of which homework problems to have completed based on what topics were completed in lecture. The best approach is to work these problems in the order given until you reach a problem that we clearly have not discussed yet. Stop there. It is certainly OK to continue deeper into the list (the text reading will help), but further problems will be covered at the following week's Problem Session. The answers to the assigned problems will be discussed in Problem Session. You will not turn in your work, but your instructor will explain the grading procedure for Problem Sessions. IT IS EXTREMELY BENEFICIAL FOR YOU TO WORK ALL OF THESE PROBLEMS ON PAPER AND HAVE THEM READY FOR PROBLEM SESSION! The problems in your text are written in pairs, and the answers to the odd numbered questions appear in the Appendix. However, nearly all assigned problems are even-numbered. If you are curious whether your answers are correct for the assigned problems, you can choose to solve the odd-numbered problems to check your mastery of the material. Chapter 2 : Measurement and Problem Solving a,c,d a & d 56 c & d 60 b & d c & d 70 c & d Chapter 3: Matter and Energy (do 1st part only) Chapter 4: Atoms and Elements a & b 92 a & b 96

2 Chapter 9: Electrons in Atoms and the Periodic Table ADDITIONAL EXERCISE #1) Write a Bohr diagram for a) sulfur b) magnesium c) magnesium +2 cation d) chlorine -1 anion 78 c & d 82 a, b, & d and Chapter 4 problems as well as...additional EXERCISE #2 Which is the smaller item in EACH pair given? a) calcium atom OR calcium cation b) phosphorous atom OR phosphorous anion c) fluorine atom OR the ion of fluorine Chapter 5: Molecules and Compounds b not e 64 b through e a,b, and d 74 a Chapter 7: Chemical Reactions Balance the following equations: K + H 2 O H 2 + KOH NH 3 + O 2 NO + H 2 O SiO 2 + HF SiF 4 + H 2 O NO + O 2 NO 2 CuO + H 2 SO 4 CuSO 4 + H 2 O MnCL 2 + AL Mn + ALCL 3 (continued)

3 Hydrogen peroxide, H2O2, breaks down into water and oxygen gas. Write a balanced equation for this reaction. When magnesium metal is heated with pure nitrogen gas, a green substance named magnesium nitride is formed. Write a balanced equation for this reaction. (continued) 38 a (challenge question - use fractional approach from notes and text) 38 b 50 Additional Exercises for Chapter 7: #1) Rewrite the following equation and balance it by providing coefficients: AL + HBr -----> ALBr3 + H2 #2) Consider the five classes of chemical reactions discussed in class [precipitation, acid/base, gas evolution, oxidation-reduction, and combustion] Assign one of these terms to each of the descriptions shown below: a) requires oxygen and produces water b) forms water and a salt c) electrons are transferred d) solid forms e) carbon dioxide forms easily #3) Classify the following reactions as described in class and list the clues that gave you the answer: a) HNO3 (aq) + KOH (aq) -----> KNO3 (aq) + H2O (l) b) 2 Na + F > 2 NaF

4 Chapter 6: Chemical Composition 3 8 a & b a & b 76 c 78 a 96 b Chapter 8: Quantities in Chemical Reactions 16 a & c 18 a 22 a & b 30 a 32 c a & b 46 b 54 a 60 Chapter 10: Chemical Bonding a* 58 d* * need not draw resonance forms ADDITIONAL EXERCISE #1) Water is a polar compound. Oxygen (O2) does not dissolve well in water. Use the Like-Dissolves-Like Rule and the Lewis Structure for O2 to explain WHY they do not mix well. Chapter 11: Gases 34 a & d a 90 a Chapter 12: Liquids, Solids, and Intermolecular Forces 48 then ADDITIONAL EXERCISE #1) Hyperbaric Oxygen (HBO) therapy is used to treat burn patients. Hyper means above and baric indicates pressure. These enclosed chambers can be pressurized up to a value of six atmospheres. Would water boil at a lower temperature or a higher temperature in one of these functioning hyperbaric chambers? Explain. followed by and ADDITIONAL EXERCISE #2) Water (H2O) has a much higher boiling point than

5 the compound H2S. What intermolecular force does water have that H2S does not have? Draw Lewis Structures as part of your answer. Chapter 13: Solutions a & c 64 a 68 a 70 a then. ADDITIONAL EXERCISE #1) Consider the following solutions:1 m LiBr,1 m BaBr2, and 1 m NaNO3. Which solution would have the higher boiling point? Which solution would have the lower freezing point? then Chapter 14: Acids and Bases a (omit conjugate portion) a & d 58 b,c, & d 62 b,c, & d 66 a & c a & b 78 a & b 27 ADDITIONAL EXERCISES for Chapter 14: #1) What is the ph of a solution containing a concentration of [H + ] = mol/l? #2) What is the ph of a reagent solution labeled as follows: 0.1 M HCl? #3) A solution was found to have a ph of 3. What is the hydrogen ion concentration, [H + ], of the solution? Be sure to report the proper units with your answer. #4) If a solution has a poh of 4, what would be the ph of the solution? #5) A sodium hydroxide solution has a hydroxide-ion concentration of [OH-] = mol/l. What is the ph of this solution?

6 Chapter 15: Chemical Equilibrium ADDITIONAL EXERCISES for Chapter 15: #1) Sketch a Reaction Coordinate Diagram for an ENDOTHERMIC reaction. Include labels for reactant, product and activation energy. #2) List at least four ways you could increase the rate of a chemical reaction. END OF HOMEWORK