che2a-exam1-w2006-key

che2a-exam1-w2006-key - CHEMISTRY 2A-c Hour Exam I Winter...

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CHEMISTRY 2A-c NAME ______________________ Hour Exam I T. A. ________________________ January 30, 2006 Lab Section Number ___________ Winter 2006 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 6 pages. Question Credit I. (16 points) II. (33 points) III. (51 points) Total (100 points) Avogadro’s number: 6.022x10 23 #/mol M 1 V 1 =M 2 V 2 d = m/V 1
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I. (16 poits) 1. (4 points) Give the symbols of the following elements: Cadmium ___ Cd ____ Antimony____ Sb ___ Tungsten____ W ______ Arsenic___ As ____ 2. (4 points) Write in the name of the elements whose symbols are given below. Mn___ Manganese __________ Ti____ Titanium _________ Se___ Selenium __________ P____ Phosphorous _________ 3. (4 points) Give the correct formula of the following compound names. Cobalt (II) chlorate____ Co(ClO 4 ) 2 ________ Magnesium nitride_____Mg 3 N 2 _______ Calcium phosphate___ Ca 3 (PO 4 ) 2 ________ Calcium carbonate____ CaCO 3 ______ 4. (4 point) Give the compound names of the following formula H 2 SO 3 _______ sulfurous acid ________ HF____ Hydrofluoric acid _or hydrogen fluoride B a ( N O 2 ) 2_______ Barium nitrite ______ NH 4 Cl___ Ammonium chloride _______________ II. (33 points total, 2 points each unless specified) 1. The number of significant figures for 0.00010200 is __ 5 _________ 2. Give the result of the division in the correct significant figure (use the scientific notation) (82) ÷ (0.253) = ____ 3.2x10 2 ______. 3. (3 points) Give the numbers of electrons, protons, and neutrons in the 192 Ir
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che2a-exam1-w2006-key - CHEMISTRY 2A-c Hour Exam I Winter...

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