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eng-spring07-q202

eng-spring07-q202 - CHEM 151 Quiz 2 Show your work for full...

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CHEM 151: Quiz 2 NAME ___________________________ ID #_______________ Show your work for full credit Eng Q202 1. (7 pts total) Here is some potentially helpful information about iron, Fe: atomic number = 26, atomic weight = 55.85 u, and density = 7.87 g/cm 3 . a. (2 pts) Determine the volume (in cm 3 ) of a rectangular piece of iron that has the dimensions 2.50 cm by 7.25 mm by 1.55 mm . b. (2 pts) Determine the mass (in grams) of that rectangular piece of iron. c. (3 pts) Determine the number of iron atoms in that rectangular piece of iron. Potentially useful information: N = 6.02214 × 10 23 . Hint: how many moles are in that piece of iron? 2. (3 pts) Rutherford proposed the nuclear model of the atom after his experiments showed that most particles simply pass through material. What was the name of that experiment? a) cathode ray tube experiment b) oil drop experiment c) gold foil experiment d) none of these 3. (4 pts) The hypothetical element Arizonium, Az, has three isotopes. Isotope Az-100 has an isotopic abundance of 10.00% and has a mass of 100.0 u. Isotope Az-101 has an isotopic abundance of 30.00% and has a mass of 101.0 u.
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