Chem 142A Practice Exam Key MT1

Chem 142A Practice Exam Key MT1 - Chern 142A: Exam 1 Please...

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!)~ Chern 142A: Exam 1 Please read first: (a) Before starting, please check to see that your exam has 7 pages, which includes the periodic table and some constants at the back (b) Fill in your name, section, and student number on Side 1 of the Answer Sheet. (c) To receive credit, you must mark Test Version B on Side 1 of the Answer Sheet. (d) This is a multiple-choice exam. Answer all questions on your Answer Sheet. (e) This exam is over at 9:20 AM. No answer sheet will be accepted after 9:20 AM. (1) When you are done with the exam, place your Answer Sheet in one ofthe stacks of Answer Sheets at the front of the room, and take the exam questions home with you. Donot open your packs until after you completely exit the room. (g) Note that the questions toward the end of the test count more points each, since they require more calculations and more knowledge.
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This is test version B . . To receive credit you must mark version B on side 1 ofthe Answer Sheet. (3 points each) Enter the following elements in their proper classes or groups: 1. Mg g 2. Xe, A. 3. chlorine, C 4. copper f 5. potassium. p. a. Rare or noble gases b. Alkaline earths c. Halogens d. Alkali metals e. Transition metals 6. (3 points) The result of (3.8621 x 1.565) - 6.04 is properly written as C b. 0.004186 0.00419 ~.#Wz. .\)( 1.5"5= (o.Ot-t'tI'6c. .S' ~ (P.O!.iy (y ~{~ ~'8~) ~ d. 0.00 0.004 c,. o~ 'i \ '0(. .'5' /dl~~~ 5'8\;'~ "A So\~+!'#f'l ~~O,~ v- e. 0.0042 a. ;-o0c;c;5~ ~[? # ~] f) 7. (3 points) A covalent bond is generally characterized by: the attraction between the + ions and - ions. (~on ((. . 'oof)d.\~) ® the sharing of2 electrons between atoms. (Co V 0;, \ tit #()o\'l~\(\.3) . c. the attraction between water molecules and the ions in an aqueous solution. (1-\'1 t('~ ~J.I~ ') d. both a) and b). e. both a) and c). A 8. (3 points) Which elements have a charge of -1 (i.e., one extra electron) on their most stable ions? (§) CI, F, Br.
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Chem 142A Practice Exam Key MT1 - Chern 142A: Exam 1 Please...

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