1 Exam I CHEM 1303.001 FALL 2018 Name (print legibly)___________________________________________Seat no.__________On my honor, I have neither given nor received unauthorized aid on this exam. Signed _______________Date September 19, 2018 Part 1. 40 pts 1.(14) pts. Calcium phosphide reacts with water to produce phosphine, PH3, and calcium hydroxideaccording the balanced equation below. Consider a reaction where 40.5gramsof PH3are produced,and 25.7gramsof Ca3P2remain unreacted.Needed molar masses for the problem are givenbelow each formula.All table entries are in moles.Ca3P2(s)+6 H2O(l)à2 PH3(g)+3 Ca(OH)2(s)molar masses:18218.034.0--Initial (mol)Change (mol)Final (mol)a.Fill in all9table entries inmoles.DO NOT CALCULATE AMOUNTS FOR Ca(OH)2.Show your work below for the entries above.b.The limiting reagent is ___________c.Calculate how manygramsof Ca3P2were present at the start of the reaction.
2 2. Nomenclature. 12 pts. total. 2 pts. each.Fill in the names and formulas in the table below.NameFormulacalcium dichromatelithium carbonate pentahydrateperbromic acidSe4F6VI5K2C2O43.(8 pts)In this question, make sure to specify (aq), (s), (l), (g) for all species.Consider the reaction between acetic acid, CH3COOH, and Ba(OH)2, in aqueous solution.a.Write the balancedmolecularequation.b.Write theionicequation.Circle the spectator ion(s)in this reaction.c.Write thenet ionicequation.4.(6 pts)Write the names and formulas for the six strong acids. (6 pts for all correct. 5 pts for 5 correct. 4pts for 4 correct. No pts for less than 4 correct.NameFormula
3 Part 2. Multiple choice (use answer card). 60 pts. total. 3 pts. each. 20 questions. Indicate the BESTanswer for the questions in this section by completely filling in the appropriate space on the answer card with a #2 pencil. Mark only one space per question. 1. Express the answer to the following operation with the correct units and number of significant figures. (8.862 x 10–3km + 3.351 x 10–2km)2–––––––––––––––––––––––––––––––––– = (8.022 x 10–2km/s) a. 2.238 x 10–2km s b. 0.5282 s c. 2.238 x 10–2km/s d. 7.573 x 10–3km s e. 0.5282 km s 2. The density of methanol, a colorless organic liquid used as solvent, 0.792 g/mL. Calculate the volume (in mL) of 15.0 g of the liquid. 3. 50.0 lb = ________ nanograms. (1.00 lb = 454 g)4. Pb#$%##&%contains
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