Homework 4-problems - kramer (jrk2286) – Homework 4 –...

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Unformatted text preview: kramer (jrk2286) – Homework 4 – sutcliffe – (90830) 1 This print-out should have 35 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This is the last HW and covers the parts of Chapters 4, 9 10 that are on the 4th exam. You wont have this many questions on the exam, but this should give some good prac- tice. Note that quite a few of these look com- plex but once you have thought about them you will realise not much math is needed. Try to decide what key terms in these Q’s (and any other practice Q’s you do) clue you in to which equation to use. 001 10.0 points Name H 3 PO 2 . 1. perphosphorous acid 2. hypophosphoric acid 3. perphosphoric acid 4. phosphorous acid 5. phosphoric acid 6. hypophosphorous acid 7. hydrophosphoric acid 002 10.0 points Which one of the following is a water-soluble, weak electrolyte? 1. Ca(OH) 2 2. NH 4 ClO 3. H 2 CO 3 4. H 2 SO 4 5. KBr 003 10.0 points How much solute is needed to make 4.65 L of a 1.84 M solution of Ba(NO 3 ) 2 ? Answer in units of g. 004 10.0 points We wish to dilute some 18 . 4 M H 2 SO 4 solution to make 600 mL of a 0 . 1 M H 2 SO 4 solution. How much of the 18 . 4 M solution should we start with? 1. 1.80 mL 2. 2.70 mL 3. 4.00 mL 4. 3.26 mL 5. 4.60 mL 005 10.0 points What are the products of the reaction be- tween bromic acid and potassium hydroxide? 1. KBrO 3 + H 2 O 2. K 2 BrO 3 + H 2 O 3. KBrO 3 + H 3 O + 4. K 2 BrO 2 + H 2 O 5. KBrO 3 + OH − 6. KBrO 2 + H 2 O 7. KBrO 2 + H 3 O + 006 10.0 points What, if anything, is precipitated when aque- ous solutions of Ba(OH) 2 and MgSO 4 are mixed? 1. both BaSO 4 and Mg(OH) 2 2. Nothing precipitates. 3. only BaSO 4 4. only Mg(OH) 2 kramer (jrk2286) – Homework 4 – sutcliffe – (90830) 2 007 10.0 points Write the net ionic equation for this reaction occurring in water: Sodium phosphate and calcium chloride are mixed to form sodium chloride and calcium phosphate. 1. 2 PO 3 − 4 + 3 CaCl 2 → 6 Cl − + Ca 3 (PO 4 ) 2 2. No reaction occurs. 3. 2 PO 3 − 4 + 3 Ca 2+ → Ca 3 (PO 4 ) 2 4. 2 Na 3 PO 4 + 3 Ca 2+ → 6 Na + + Ca 3 (PO 4 ) 2 5. PO 2 − 4 + Ca 2+ → CaPO 4 008 10.0 points When a hydrocarbon is burned in the pres- ence of oxygen, the amount of energy in the universe 1. stays the same. 2. increases. 3. decreases. 009 10.0 points A sample of an ideal gas having a volume of 0.645 L at 298 K and 10.0 atm pressure is al- lowed to expand against a constant opposing pressure of 0.383 atm until it has a volume of 1.000 L at 200 K and the pressure equals the opposing pressure. What is the work for the system? Answer in units of J. 010 10.0 points A CD player and its battery together do 500 kJ of work, and the battery also releases 250 kJ of energy as heat and the CD player re- leases 50 kJ as heat due to friction from spin- ning. What is the change in internal energy of the system, with the system regarded as the CD player alone? Assume that the bat- tery does 500 kJ of work on the CD player,...
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This note was uploaded on 02/12/2012 for the course CH 301 taught by Professor Fakhreddine/lyon during the Summer '07 term at University of Texas at Austin.

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Homework 4-problems - kramer (jrk2286) – Homework 4 –...

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