c205_final_w07_all_sections_hints

c205_final_w07_all_sections_hints - Course: CHEMISTRY...

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Course: CHEMISTRY Number: 205/4 Section: 03, 04 and 52 Instructors: P.H. Bird, C.W. Rogers Examination: Final Date: 28 th April, 2007 Time: 14:00 - 17:00 # of pages: 11 Materials Allowed: A data sheet and periodic table are attached to this paper - no other materials are allowed . Calculators Allowed: Yes (Cell phones or electronic dictionaries may NOT be used as calculators.) Special Instructions: This exam contains three sections. Please read the instructions before each section carefully. LAST NAME: ____________________________ FIRST NAME: ____________________________ STUDENT NUMBER: _____________________ SIGNATURE: ____________________________ PLEASE READ THIS PAGE WHILE YOU WAIT TO START. Check that you have 13 pages including this page. Please write your ID # on all pages. A periodic table and “useful information” are provided; you CAN remove those pages. Read ALL questions carefully BEFORE starting the exam, and answer ALL questions. Write all answers in the space provided (use the backs of the pages for rough work). SHOW YOUR WORK FOR ALL CALCULATIONS, or you will NOT get full marks. GOOD LUCK! PLEASE RAISE YOUR HAND IF YOU NEED CLARIFICATION. Please leave blank
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ID Number ______________________ Chem 205 Winter 2007 Final Exam Sections 03, 04 and 52 - page 2 Section I. The following 20 questions are multiple choice. They are worth 2 marks each. You may do rough work on your exam paper, but it will not be marked. You must mark your answers using a soft pencil on the machine readable answer form provided. Do not forget to mark your name and student number (your birth date is not required). 1. A lump of magnesium metal weighing 11.81 g is dropped into a graduated cylinder containing 21.3 mL of water. The level of water in the cylinder rises to 28.1 mL. What is the density of magnesium? a. 0.58 g cm –3 b. 0.58 cm g 3 c. 1.7 g cm –3 d. 1.74 g cm –3 e. 1.7 cm g –3 Hint: Be careful about resulting significant figures when you do the required subtraction. 2. Consider the following list of substances, and pick the correct statement: 1. Copper 2. Ethanol 3. Soda water (in the bottle) 4. Blood a. 1 and 4 are pure substances, 3 is a heterogeneous mixture, 4 is a homogeneous mixture. b. 1 is an element, 2 is a compound, and 3 and 4 are homogeneous mixtures. c. The only pure substance in the list is copper, the rest are mixtures. d. 1 is an element, 2 is a pure substance, 3 is a homogeneous mixture, and 4 is a heterogeneous mixture. e. 1, 2 and 4 are pure substances, and 3 is a heterogeneous mixture. Hint: Blood looks homogeneous, but is it really? 3. Based on their position in the periodic table, which of these pairs of elements would you expect
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c205_final_w07_all_sections_hints - Course: CHEMISTRY...

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