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C205_mid-term_w09_03-ans - _Name I.D Number CHEMISTRY 205...

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Page 1 _Name: ____________________________________________ I.D. Number: ________________ CHEMISTRY 205 - SECTION 03 - MID TERM EXAM March 3 rd 2009, 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 as calculators are allowed. Answers : Correct choices: red , Answers or explanations: blue , Editorial Comments: green Section I. Complete each of the following five statements with the appropriate word(s). They are worth 1 mark each. 1. A mixture such as iron filings and sand is called a ___ heterogeneous __ mixture. 2. A ___ neutron _____ is an atomic particle with a mass of about 1 atomic mass unit, and no charge. 3. A series of measurements which agree very closely with each other would be called __ precise ___. 4. The elements in group 1 of the periodic table are called the ___a lkali ___ metals. 5. The compound N 2 O 5 would be called __ dinitrogen pentoxide __. Section II. The following 14 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. Which statement concerning NaCl is true? a. NaCl has properties similar to sodium metal and chlorine gas. b. NaCl is a homogeneous mixture. c. NaCl is a heterogeneous mixture. d. The percentage of Na in NaCl is dependent on where the sample is obtained. e . NaCl is composed of ions, which are electrically charged atoms. 2. All of the following are examples of chemical change EXCEPT a . the condensation of steam. There is no change in the H 2 O molecules; only a physical change. b. the rusting of iron. c. the combustion of propane gas. d. the tarnishing of silver.
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