C205_mid-term_w10_04-ans - _Name: _(Please print) I.D....

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Name: _________________________________(Please print) I.D. Number: ________________ CHEMISTRY 205 - SECTION 04 - MID TERM EXAM March 3 rd 2010, 10:15 – 11:30 Instructor: P.H. Bird Instructions : THIS IS A CLOSED BOOK EXAM and NO MATERIALS ARE TO BE SHARED. Use the backs of the pages for rough work. Please attempt all questions. The periodic table attached is the only one you are allowed to use. No electronic dictionaries are allowed. No cell phones being used as calculators are allowed. Please do not write in this space. Section I Section II Section III Total
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2 Section I. Complete each of the following five statements with the appropriate word(s). 1. (1 mark) Pure carbon can exist in several forms called _allotropes_ . Examples include diamond, graphite, and buckminsterfullerene. 2. (2 marks) Mendeleev's original periodic table placed the elements in order of increasing _atomic_ _weight/mass_ , while the modern periodic table places the elements in order of increasing _Atomic_ _number_ . 3. (1 mark) In their reactions, metals generally lose electrons to become _cations_ , and nonmetals generally gain electrons to become _anions_ . 4. (1 mark) A(n) _reducing_ agent loses electrons in an redox reaction. 5. (1 mark) The net ionic equation for the reaction of iron(II) chloride and potassium oxalate is shown below. Fe 2+ (aq) + C 2 O 4 2- (aq) FeC 2 O 4 (s) Chloride and potassium ions are referred to as _spectator_ ions because they are not involved in the reaction. Section II. The following 12 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. According to the kinetic-molecular theory of matter, particles in a gas a. are packed closely together in a regular array. (would be a crystalline solid) b. are packed closely together like solids, but they are not confined to specific positions. (might describe a liquid.) c. expand to fill their container. (correct) d. vibrate back and forth about an average position. (would apply to a solid) e. move slower as the temperature increases. (always wrong!) 2. You can identify a metal by carefully determining its density. A 2.166 g rectangular block of an
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This note was uploaded on 11/26/2010 for the course CHEMISTRY chem205 taught by Professor Mariela during the Fall '10 term at Concordia University Irvine.

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C205_mid-term_w10_04-ans - _Name: _(Please print) I.D....

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