Ch 2-End of Chapter Questions

# Ch 2-End of Chapter Questions - 9 The maximum speed limit...

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9. The maximum speed limit in many states is 65 miles per hour. What is this speed in kilometers per hour? 1.8 10 2 km/hr 1.0 10 2 km/hr 1.5 10 2 km/hr 0.9 10 2 km/hr 12. A Volkswagen engine has a displacement of 120 in. 3 . What is this volume in cubic centimeters? In liters? 2.4 10 3 cm 3 , 24 L 2.1 10 3 cm 2 , 0.21 L 2.0 10 3 cm 3 , 2.0 L 1.8 10 3 cm 3 , 1.8 L 17. A crystal of fluorite (a mineral that contains calcium and fluorine) has a mass of 2.83 g. What is this mass in kilograms? In pounds? Give the symbols for the elements in this crystal. 0.00478 kg, 0.01053 lb, Ca and F 0.00283 kg, 0.00624 lb, Ca and F 0.00417 kg, 0.00919 lb, Cl and Fr 0.00389 kg, 0.00857 lb, Cl and Fr 30. A well-known breakfast cereal contains 280 mg of sodium per 30-g serving. What percentage of the cereal is sodium? Isotopes

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0.9% 1.3% 1.7% 0.5% 33. The artificial radioactive element technetium is used in many medical studies. Give the number of electrons, protons, and neutrons in an atom of technetium-99. 43 protons, 56 electrons and 43 neutrons 43 protons, 56 electrons and 56 neutrons 43 protons, 43 electrons and 56 neutrons 56 protons, 56 electrons and 43 neutrons 41. Give the mass number of each of these atoms: (a) beryllium with 5 neutrons, (b) titanium with 26 neutrons, and (c) gallium with 39 neutrons. (a) 9; (b) 48; (c) 70 (a) 10; (b) 48; (c) 70 (a) 9; (b) 48; (c) 71 (a) 10; (b) 107; (c) 70 (a) 9; (b) 107; (c) 70 (a) 9; (b) 107; (c) 71 (a) 10; (b) 107; (c) 71 (a) 10; (b) 48; (c) 71 45. How many electrons, protons, and neutrons are there in an atom of (a) calcium-40,
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## This note was uploaded on 09/13/2008 for the course CHEM 1410 taught by Professor Acree during the Spring '08 term at North Texas.

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Ch 2-End of Chapter Questions - 9 The maximum speed limit...

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