Homework 4-solutions-1

Homework 4-solutions-1 - kramer (jrk2286) Homework 4...

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kramer (jrk2286) – Homework 4 – sutclife – (90830) 1 This print-out should have 35 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices be±ore answering. This is the last HW and covers the parts o± 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 ±ew o± 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 correct 7. hydrophosphoric acid Explanation: H 3 PO 4 is phosphoric acid. H 3 PO 2 has two ±ewer oxygens and would there±ore be named hypo phosphor ous acid. 002 10.0 points Which one o± the ±ollowing is a water-soluble, weak electrolyte? 1. Ca(OH) 2 2. NH 4 ClO 3. H 2 CO 3 correct 4. H 2 SO 4 5. KBr Explanation: All o± the choices are electrolytes, but only carbonic acid (H 2 CO 3 ,aweakac id)doesnot ionize completely, so it is a weak electrolyte. 003 10.0 points How much solute is needed to make 4.65 L o± a1.84Msolutiono±Ba(NO 3 ) 2 ? Correct answer: 2235 . 68 g. Explanation: [Ba(NO 3 ) 2 ]=1.84M V soln =4.65L m Ba(NO 3 ) 2 =? M = mol solute Lsoln mol solute = 1 . 84 M × 4 . 65 L =8 . 556 mol n =gsolute × 1mo lso lute molar mass solute m solute =#o±moles × molar mass solute . 556 mol Ba(NO 3 ) 2 × 261.3 g 1mol =2235 . 68 g Ba(NO 3 ) 2 004 10.0 points We wish to dilute some 18 . 4MH 2 SO 4 solution to make 600 mL o± a 0 . 1MH 2 SO 4 solution. How much o± the 18 . 4Msolutionshouldwe start with? 1. 1.80 mL 2. 2.70 mL 3. 4.00 mL 4. 3.26 mL correct 5. 4.60 mL Explanation:
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kramer (jrk2286) – Homework 4 – sutclife – (90830) 2 M 1 V 1 = M 2 V 2 V 2 = M 2 V 2 M 1 = (0 . 1M)(600mL) 18 . 4M =3 . 26087 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 correct 2. K 2 BrO 3 2 O 3. KBrO 3 3 O + 4. K 2 BrO 2 2 O 5. KBrO 3 +OH - 6. KBrO 2 2 O 7. KBrO 2 3 O + Explanation: 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 correct 2. Nothing precipitates. 3. only BaSO 4 4. only Mg(OH) 2 Explanation: This is a metathesis reaction with the prod- ucts barium sulFate (BaSO4) and magnesium hydroxide (Mg(OH) 2 ). Both oF these prod- ucts are insoluble and will Form precipitates. 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. 2PO 3 - 4 +3CaCl 2 6Cl - +Ca 3 (PO 4 ) 2 2. No reaction occurs. 3. 3 - 4 +3Ca 2+ Ca 3 (PO 4 ) 2 correct 4. 2Na 3 PO 4 2+ 6Na + 3 (PO 4 ) 2 5. PO 2 - 4 2+ CaPO 4 Explanation: 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. correct 2. increases.
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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-solutions-1 - kramer (jrk2286) Homework 4...

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