chem1A-spring05-mt1-Chandler-soln

chem1A-spring05-mt1-Chandler-soln - KEY Chem 1A First...

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Page 1 of 6 KEY Chem 1A First Midterm Examination February 7, 2005 Professor David Chandler 1 2 3 4 5 6 7 8 9 10 Extra Instructions As indicated, either fill in blank space with appropriate symbol or number or circle the correct answer(s). Some multiple choice questions may have more than one correct answer, in which case all correct answers are required for full credit. Use back of pages for your scratch work. Physical constants you may need: N 0 (Avogadro’s #) = 6.022 × 10 23 mol -1 1 angstrom (Å) = 10 -10 m = 100 pm Speed of light = 3.0 × 10 8 m/s H (Planck’s constant) = 6.626 × 10 -34 J·sec Ionization Potential of H = 2.18 × 10 -18 J 0 K = -273.15 ° C Name:_______ _________ Signature:_________________________ Section:___________________________ GSI:______________________________
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Page 2 of 6 10 pts 1. For an experiment in lab, a student reacts baking soda (NaHCO 3 ) with 6.00 M vinegar (CH 3 COOH) to produce carbon dioxide (CO 2 ) plus sodium acetate (NaCH 3 COO) and water (H 2 O). If 0.9864 g of NaHCO 3 is reacted with 1.50 mL of vinegar, how many moles of CO 2 will be produced? A) 1.17 × 10 -2 B) 9.00 × 10 -3 C) 0.396 D) 6.00 E) 9.00 3 pts 2. (a) An expected empirical formula for a compound of Mg and O is A) Mg 2 O B) C) MgO 2 D) Mg 2 O 3 3 pts (b) Similarly, a compound of Li and H A) B) is LiH 2 C) doesn’t exist D) is Li 2 H 4 pts (c) Which of the following is NOT expected to be a stable compound A) FeO B) Fe 2 O 3 C) NaOH D) Ca(OH) 3 6 pts 3. A single K + ion contains ___ (B) 18 ____ electrons, ___ (C) 19 __ protons and most probably __ (D) 20 __ neutrons.
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chem1A-spring05-mt1-Chandler-soln - KEY Chem 1A First...

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