Practice Exam I Fall 2004

Practice Exam I Fall 2004 - CHEM 105 Exam I Fall 2003 1)...

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CHEM 105 – Exam I Fall 2003 1) Determine the number of protons, neutrons, and electrons in each of the following. Also, provide the atomic symbol and name if so asked. ( 13 pts total) The neutral alkali metal in the fourth row of the periodic table and with a mass number of 41. P ___________ N ___________ E ___________ Atomic Symbol _______________ Atomic Name _______________ The ion of 108 Ag (note you must know the charge) P ___________ N ___________ E ___________ Atomic Name _______________ A neutral tin-121 atom P ___________ N ___________ E ___________ Atomic Symbol _______________ 1
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2) Provide the name or formula, as appropriate for the following: (14 pts total) Pb(HPO 4 ) 2 _________________________________ Manganese (II) oxide ____________________________ NH 4 NO 2 ________________________________ HNO 2 (aq) ____________________________________ NO 3 ____________________________________ Gallium chlorite ___________________________ Tin (IV) sulfate ____________________________ 3) Write a balanced chemical equation (including physical states) for the reaction of aqueous potassium carbonate with liquid hydrochloric acid to form gaseous CO 2 , liquid water, and aqueous potassium chloride. (8 pts total) 2
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4) How many grams of C 4 H 10 must be burned (that is, combusted) to form 22.45 L of CO 2 at 27°C and 750 torr. (10 pts) 5) A 1 mole sample of water vapor at 400 K occupies 32.84 L at 1 atm. Calculate the number of mL occupied at 200 K. Knowing that the density of water at 200 K is about 1g/mL compare the density of the water vapor at 200 K from your calculated volume. Comment on why this result is so far off. (10 pts) 3
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6) Given the BALANCED chemical equations below, calculate the actual yield of Mn 3 (PO 4 ) 2 of the reaction of 1.2 grams of H 2 C 2 O 4 with 0.7 grams of KMnO 4 if the percent yield of the first step is 95% and the percent yield of the second step was 92%. Assume that all chemicals other than H 2 C 2 O 4 and KMnO 4 are present in large excess. (15 pts) 5H 2 C 2 O 4 + 2KMnO 4 + 6H + 10CO 2 + 2Mn +2 8H 2 O + 2K + (step 1: 95% yield) 3Mn +2 + 2 PO 4 -3 Mn 3 (PO 4 ) 2 (Step 2: 92% yield) 4
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7) What is the density of and v rms or a gas that effuses four times slower than ammonia? The conditions are 1 atm and 300K. (10 pts) 8) How many molecules of oxygen are required to ensure a 50% excess (that is 50% more molecules than needed to react with all the C 6 H 12 O 6 of O 2 in the reaction of 13.32 grams C 6 H 12 O 6 in the following reaction? (10 pts) 9) A compound is found be 46.21% by weight C, 9.01% H, 13.74% N and 31.03% O. Find the empirical formula of the compound. (10 pts) 5
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10) Provide the requested information for each of the following: (22pts) For a cadmium-110 cation: Number of protons ____________ Number of neutrons ____________ Number of electrons ____________ For a neutral W atom with 25 more neutrons than protons Number of protons ____________ Mass Number ____________ Number of electrons ____________ Atomic Name: __________________
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This test prep was uploaded on 04/20/2008 for the course CHEM 105 taught by Professor F during the Fall '05 term at Grove City.

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Practice Exam I Fall 2004 - CHEM 105 Exam I Fall 2003 1)...

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