CHEMISTRY PRACTICE EXAM I - Exam 1 Chemistry 1A Summer 2008...

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Exam 1 Chemistry 1A Summer 2008 JAC EXAM I NAME: __________________ __________________ last first THERE ARE 4 PAGES TO THIS EXAM. Significant Figures must be correct. All set-ups must be shown (where applicable) or you will receive NO credit! The following are constants and conversion factors you may or may not need. mole particles 10 x 6.02 23 2.54 cm = 1 in 1 lb = 454.0 g 1 gal = 3.80 L 1 gal = 4 qt 1 qt = 2 pt ______________________________________________________________________ 1. Calculate the number of H atoms in 2.35g of (NH 4 ) 3 PO 4 . ANSWER: 1.52 X 10 23 H atoms 2. The density of a block of aluminum is 22.5 lb/gal. Express this density in In units of g/cm 3 . ANSWER 2.70 g/cm 3 3. How many protons, neutrons, and electrons are in a xenon-129 atom? Protons 54 Electrons 54 Neutrons 75
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4. Silver has two naturally occurring isotopes. The average mass of a silver atom is 107.87 amu. If 51.839 % of silver is found as silver-107 (106.91.91 amu), what is the mass of the other isotope? ANSWER 108.91 amu 5. What is the empirical formula of a compound that has 66% Calcium and 34% Phosphorous? ANSWER Ca 3 P 2 6. Write the correctly balanced equations for the following reactions.
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