101Q1_2006 - 4. (7 points) An engineer wants to coat a...

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CHE 101 Summer Session I 2006 Quiz 1 Name _______________________________________________ TA__________________________________________________ 1. (8 points) Name each of the following. Spelling counts. (a) Ca(NO 2 ) 2 calcium nitrite (b) Cr 3 P 2 chromium(II) phosphide (c) Cr(ClO 2 ) 3 chromium(III) chlorite (d) P 2 O 5 diphosphorus pentoxide 2. (6 points) Write the formula for each of the following: (a) ammonium acetate NH 4 C 2 H 3 O 2 (b) manganese(IV) sulfate Mn(SO 4 ) 2 (c) iron(II) hydrogen phosphate FeHPO 4 3. (3 points) Give the number of protons, neutrons, and electrons in the cation 59 27 Co 2+ . protons = _27___ neutrons = _32___ electrons = __25___ page 1 of 4
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Unformatted text preview: 4. (7 points) An engineer wants to coat a mirror of area 4.00 cm 2 with a gold film 1.3 micrometers thick. How many atoms of gold will be in the film? Gold has an atomic mass of 196.96654 amu and a density of 19.32 g/cm 3 . One amu is 1.660539x10-24 grams. (Volume of the film = thickness x area) (4.00 cm 2 )(1.3 m)(100 cm 2 /10 6 m)(19.32 g/cm 3 .(1 amu/1.660539x10-24 g)(1 atom/196.96654 amu) = 3.1x10 19 atoms 5. (1 point) Using scientific (exponential) notation, write the sum of 0.0120 and 100.02501 to the correct number of significant figures. 0.0120 100.02501 100.0370 = 1.000370x10 2 page 2 of 4...
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101Q1_2006 - 4. (7 points) An engineer wants to coat a...

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