Workshop 2 Answer Key

Workshop 2 Answer Key - Workshop#2 Chem 1A 1 Calculate the...

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Workshop #2 Chem 1A Fall 2010 1. Calculate the mass of 0.360 moles of phosphorous (30.97g/mol)? The answer should have 3 significant figures. 2. How many atoms are in 2.87 g of aluminum (molar mass = 26.98)? The answer should have 3 significant figures. 3. Locate the following examples of electromagnetic radiation on the figure below. Draw a vertical line for each frequency of radiation and label it. a. The radiofrequency of 106.7 FM KROQ (106.7 MHz) = 1.067•10 8 Hz b. Black light radiation (ie UVA radiation), 315-400 nm = 9.52- 7.50•10 14 Hz c. Yellow light, 600 nm = 5.00•10 14 Hz d. The 2.5 GHz radiation of a microwave oven = 2.5•10 9 Hz e. Cobalt-60 gamma radiation, approximately 3 x 10 20 Hz . e b c d a f. Arrange the five examples above in order of increasing wavelength, from shortest to longest e<b<c<d<a g. Arrange the five examples above in order of increasing energy, from lowest to highest a<d<c<b<e 10 8 6.626 x 10 -26 10 12 10 16 10 20 6.626 x 10
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