key-eng-fall07-q8059x02g7w

key-eng-fall07-q8059x02g7w - ( sig figs, units) 4. (3 pts)...

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CHEM 2045C: Quiz 2 NAME ___________KEY____________ N #_______________ Show your work for full credit Eng Q8059x02-gamma-7-w Potentially helpful information 1 in = 2.54 cm (exactly) 1 lb = 453.59 g 1 L = 1.0567 qt ° C = 5 / 9 ( ° F – 32) K = ° C + 273.15 For full credit, show all of your work legibly , observe all significant figures rules, and box your answers. 1. (4 pts) Give the missing name or chemical symbol of the element, as appropriate, for the following. C carbon Ag silver fluorine F mercury Hg 2. (5 pts) Convert 0.02500 ft 3 to cm 3 . 002500 12 1 254 1 707 9 3 3 3 3 3 3 3 3 3 3 . . . ft in ft cm in cm × × = 2 points each conversion factor (1 pt if they didn’t cube) 1 point for the answer (½ sig figs, ½ units) 3. (2 pts) Iron melts at 2.800 × 10 3 ° F. What is the melting point of iron in Kelvin? Change Fahrenheit to Celsius ° C = 5 / 9 ( ° F – 32) = 5 / 9 (2.800 × 10 3 ° F – 32) = 1538 ° C 1 pt Change Celsius to Kelvin K = ° C + 273.15 = 1538 ° C + 273.15 = 1811 K 1 pt
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Unformatted text preview: ( sig figs, units) 4. (3 pts) Match the following description to the appropriate scientist/philosopher by putting the letter next to the name. There is only one correct description per scientist/philosopher. A. Described atoms as identical, indivisible, and indestructible. B Antoine Laurent Lavoisier B. The Father of Modern Chemistry. C. Suggested atoms of certain substances can disintegrate, based on the discovery of the radioactive elements, Po and Ra. D Democritus D. Said matter is made up of indivisible atoma or atomos. E. Discovered the electron particle by studying cathode rays. F. Performed the oil-drop experiment, finding the charge of an electron. F Robert A. Millikan G. Discovered radioactivity. H. Performed the gold-foil experiment which gave the experimental basis for proposing the nuclear model of the atom. 5. (1 pt) Determine the number of protons in 6 13 C . 6...
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