Practice Exam (I) Key

Practice Exam (I) Key - CHEMISTRY 2A-c Hour Exam I January...

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1 CHEMISTRY 2A-c NAME ______________________ Hour Exam I T. A. ________________________ January 31, xxxx Lab Section Number ___________ Winter xxxx Lab Room ___________________ Lecture: MWF 2:10-3:00 pm CLOSED BOOK EXAM – No books or notes allowed. Place all answers in the space provided. Be sure to write your name, your T.A.’s name, and your Lab Section Number in upper right hand corner. This examination contains 3 questions on 5 pages. Question Credit I. (16 points) II. (30 points) III. (54 points) Total (100 points) Avogadro’s number: 6.022x10 23 #/mol
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2 I. (16 poits) 1. (4 points) Give the symbols of the following elements: Silver ___ Ag ____ Platinum____ Pt ___ Tin____ Sn ______ Mercury___ Hg ____ 2. (4 points) Write in the name of the elements whose symbols are given below. Kr___ Krypton __________ F____ Fluorine _________ Be___ Beryllium __________ Cr____ Chromium _________ 3. (4 points) Give the correct formula of the following compound names. Methane____ CH 4 ________ Nitrous oxide_____ N 2 O _______ Perchloric acid___ HClO 4 _________ Calcium hydroxide____ Ca(OH) 2 ______ 4. (4 point) Give the compound names of the following formula HNO 2 _______ Nitrous acid _____________ HCN____ Hydrocyanic acid _________ M g S O 4 ______ Magnesium sulfate _______ NH 3 _____ Ammonia _______________ II. (30 points) 1. The scientific notation for the number 0.00010200 is __ 1.0200x10 -4 _________ 2. Give the result of the multiplication in the correct significant figure (82)x(0.253) = ____ 20 ______. 3. Give the numbers of electrons, protons, and neutrons in 235 U . # of electrons_ 92 _____, # of protons__ 92 ____, # of neutrons__ 143 ____. 4. The atomic number (Z) of element is defined by the number of ____ protons ________in the . 5.
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This note was uploaded on 02/25/2009 for the course CHEM chem 2a taught by Professor Ng during the Winter '09 term at UC Davis.

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Practice Exam (I) Key - CHEMISTRY 2A-c Hour Exam I January...

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