key-eng-fall07-q8059x02e4x

key-eng-fall07-q8059x02e4x - 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-epsilon-4-x Continued on the back 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. Si silicon Na sodium boron B gold Au 2. (2 pts) Silver melts at 1.763 × 10 3 ° F. What is the melting point of silver in Kelvin? Change Fahrenheit to Celsius ° C = 5 / 9 ( ° F – 32) = 5 / 9 (1.763 × 10 3 ° F – 32) = 961.7 ° C 1 pt Change Celsius to Kelvin K = ° C + 273.15 = 961.7 ° C + 273.15 = 1234.8 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. Described atoms as identical, indivisible, and indestructible. E Sir J.J. Thomson 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. F Robert A. Millikan 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. G Henri Becquerel 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 7 15 N . 7...
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