key-eng-fall07-q8059x02g4x

key-eng-fall07-q8059x02g4x - 4(3 pts Match the following...

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CHEM 2045C: Quiz 2 NAME _________KEY______________ N #_______________ Show your work for full credit Eng Q8059x02-gamma-4-x 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. Ga gallium Fe iron copper Cu phosphorus P 2. (2 pts) Platinum melts at 3.215 × 10 3 ° F. What is the melting point of platinum in Kelvin? Change Fahrenheit to Celsius ° C = 5 / 9 ( ° F – 32) = 5 / 9 (3.215 × 10 3 ° F – 32) = 1768 ° C 1 pt Change Celsius to Kelvin K = ° C + 273.15 = 1768 ° C + 273.15 = 2041 K 1 pt ( ½ sig figs, ½ units) 3. (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)
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Unformatted text preview: 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. Discovered radioactivity. H Madame Curie B. Performed the oil-drop experiment, finding the charge of an electron. C. Performed the gold-foil experiment which gave the experimental basis for proposing the nuclear model of the atom. D John Dalton D. Described atoms as identical, indivisible, and indestructible. E. The Father of Modern Chemistry. F. Discovered the electron particle by studying cathode rays. F Sir J.J. Thomson G. Said matter is made up of indivisible atoma or atomos. H. Suggested atoms of certain substances can disintegrate, based on the discovery of the radioactive elements, Po and Ra. 5. (1 pt) Determine the number of protons in 7 14 N . 7...
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