C205_mid-term_w10_03-ans

C205_mid-term_w10_03-ans - _Name: _(Please print) I.D....

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Name: _________________________________(Please print) I.D. Number: ________________ CHEMISTRY 205 - SECTION 03 - MID TERM EXAM March 2 nd 2010, 08:45 – 10:00 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 phosphorus can exist in several forms called _ allotropes _. Examples include white phosphorus and red phosphorus. 2. (2 marks) Mendeleev's original periodic table placed the elements in order of increasing __ atomic _ _ __ masses/weights __ , while the modern periodic table places the elements in order of increasing __ atomic __ __ number __. 3. (1 mark) In their ionic compounds, metals have generally lost electrons to become __ cations _ _ , and nonmetals have generally gained electrons to become __ anions __. 4. (1 mark) A weak acid is only partially _ dissociated/ionized _ in aqueous solution. 5. (1 mark) The net ionic equation for the reaction of lead(II) nitrate and hydrochloric acid is shown below. Pb 2+ (aq) + 2Cl - (aq) PbCl 2 (s) The hydrogen and nitrate 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 liquid: a. are packed closely together in a regular array. (would be a crystalline solid) b. move slower as the temperature increases. (always wrong!) c. expand to fill their container. (would be a gas) d. vibrate back and forth about an average position. (would be a solid) e. are packed closely together, but are not confined to specific positions. (Correct) 2. You can identify a metal by carefully determining its density. A 8.44 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 CA.

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C205_mid-term_w10_03-ans - _Name: _(Please print) I.D....

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