Chemistry 112 Form B Fetzer Gislason
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1 Exam 1 February 10, 2003 There are 20 questions at 5 points each. The last page contains a periodic table and a solubility table. You should tear off the last page to use as reference. Directions: 1) Put your name on all sheets. 2) Work out multiple choice problems and transfer your answers to the scantron. 3) Hand in both the scantron sheet and your exam. Scantron sheet: 1) Print name (last name, first name) and fill in the corresponding bubbles. 2) Sign your name where it says signature. 3) Write: Chem112, TA s name, Form (A or B) on bottom right where it says course number and instructor. 4) Hand in both the scantron sheet and the exam to your TA.
2 1) Find the pair of isotopes of the same element from the following possibilities. 116 X 2+, X a) X, 96 X b) X 2+, 119 X c) X 2+, X d) e) X, X ) The formula of a compound is XCl 3. The X-ion in this compound has 28 electrons. The neutral metal X is a) Zn b) Cu c) Al d) Ni e) Ga 3) Which of the following are strong electrolytes? 1. HCl 2. HC 2 H 3 O 2 3. NH 3 4. KCl a) 1 & 4 b) 1, 2, 3, & 4 c) 2 & 4 d) 2 & 3 e) 1, 2, & 4 4) A bottle weighing grams contains 4.59 cm 3 of an unknown solid. Find the density of the unknown solid if the mass of empty bottle is g. a) 3.10 b) 4.67 c) 2.18 d) 10.9 e) ) Which of the following substances is insoluble in water? (Consult the solubility table.) 1. Na 2 CO 3 2. CaCO 3 3. CaS 4. K 2 S O 4 5 (NH 4 ) 2 S a) 1 & 4 b) 1, 4, & 5 c) 2 & 3 d) 2 & 4 e) 2 & 3 & 5 6) How many significant figures should be retained in the answer of the following calculation? ( ) a) 1 b) 2 c) 3 d) 4 e) 5 7) The names of Ni(CN) 2 and HClO are a) nickel (I) cyanide and hydrogen chlorine monoxide b) nickel cyanate and hydrochlorous acid c) nickel carbonate and chloric acid d) nickel (II) cyanide and perchlorous acid e) nickel (II) cyanide and hypochlorous acid 8) What is the coefficient of O 2 when the following equation is balanced? C 4 H 6 O 2 + O 2 CO 2 + H 2 O a) 3 b) 4 c) 5 d) 9 e) 11 1
3 9) How many moles of GeF 4 are needed to form 8.00 mol GeF 3 H according to the following reaction if the product is obtained in 92.6 % yield? GeH GeF 4 4 GeF 3 H a) 1.85 b) 6.48 c) 2.00 d) 7.41 e) ) What are the formulas of compounds formed between strontium ions and nitrogen ions and between magnesium ions and nitrite ions? a) SrN and Mg(NO 3 ) 2 b) Sr 2 N 3 and Mg(NO 3 ) 2 c) Sr 3 N 2 and Mg(NO 2 ) 2 d) SrN 3 and Mg(NO 3 ) 2 e) Sr 3 N 2 and Mg(NO 3 ) 2 11) In the mole in space demo, how did the mole get into space? Just to remind you, the mole was placed on top of a container in which the following reaction took place: CaC 2 (s) + 2H 2 O(l) C 2 H 2 (g) + Ca(OH) 2 (aq) a) The gas was ignited and the force of the explosion ejected the mole b) The pressure of the product gas forced the mole up into the air. c) The initial reaction evolved enough heat to send Mr. Mole hopping d) The mole was tossed into the air by Lee Marek e) The mole got tired of the whole thing and left of his own accord to seek out his shadow (to get a head start on Mr. Groundhog.) 12) The formula mass of potassium phosphite is. a) b) c) d) e)
4 13) Combustion analysis of grams of a compound containing C, H, and O yielded grams CO 2 and grams H 2 O. What is the empirical formula of the compound? a) C 3 H 9 O 2 b) C 3 H 5 O c) C 6 H 13 O 2 d) C 3 H 8 O e) C 3 H 5 O 3 14) Calculate the maximum mass of AgCl produced when 4.22 g of AgNO 3 ( g/mol) react with 7.73 g AlCl 3 ( g/mol) according to the equation, 3 AgNO 3 + AlCl 3 Al(NO 3 ) AgCl a) 17.6 b) 3.56 c) 24.9 d) 4.22 e) ) An atom of the most common isotope of gold, 197 Au 3+, has protons, neutrons, and electrons. a) 197, 79, 118 b) 118, 79, 39 c) 79, 118, 79 d) 79, 118, 118 e) 79, 118, 76 3
5 16) For the reaction, 2 MClO 3 (s) 2 MCl(s) + 3 O 2 (g) we recorded the following data: Mass MClO 3 before heating: g Mass MCl after heating g Using this information, we calculated that M must be a) Rb b) Na c) Tm d) Li e) Cs 17) A strong electrolyte is one that completely in solution. a) reacts b) dissolves c) decomposes d) ionizes e) disappears 18) All atoms of a given element have the same a) mass b) number of protons c) number of neutrons d) number of electrons and neutrons e) density 19) In the demo on electrical conductivity, which of the following substances showed electrical conductivity by causing the light to glow? 1. CuCl 2 (aq) 2. C 2 H 5 OH(aq) 3. AgNO 3 (s) 4. AgNO 3 (l, melted) 5. KMnO 4 (aq) a) 1, 4, &5 b) 1,3,4,&5 c) 1 & 5 d) 1, 2, & 5 e) all of these 20) How many atoms of H are in 52 g of C 2 H 4 O 2 (molar mass = g/mol)? a) b) c) d) e)
6 Solubility Table: 1. Nearly all ionic compounds of lithium, sodium, potassium, rubidium, cesium, and ammonium are soluble in water. 2. The nitrates and acetates of all metals are soluble. 3. The chlorides, bromides, and iodides of all metals (except silver, lead, mercury(i), and copper(i) )are soluble. 4. The sulfates of all metals (except lead, barium, and calcium) are soluble. 5. The hydroxides of all metals (except those given in rule 1) are insoluble. 6. Carbonates, phosphates, and sulfides are insoluble (except as given in rule 1). 5
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