CH121-S02-P1A - 1st Practice Exam 1. What is the density of...

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1 st Practice Exam 1. What is the density of a metal if a 15.4 gram sample has a volume of 1.96 cm 3 ? c. 7.86 g/cm 3 2. A student does a calculation using her calculator and the number 280.27163 is shown on the display. If there are actually three significant figures, how should she show the final answer? e. 2.80 x 10 2 3. Which of the following is an example of a chemical change? c. natural gas burning 4. The element chlorine is obtained for commercial use by the following method: d. Electrolysis of aqueous NaCl solutions. 5. The density of a sodium sulfate solution is 1.07 g/cm 3 . The solution is 8.00% sodium sulfate by mass. How many cm 3 of the solution are needed to supply 4.28 g of sodium sulfate? e. 50.0 cm 3 6. In the Millikan oil drop experiment, the charge on oil droplets was observed by their behavior between a positively charged plate and a negatively charged plate. The fundamental charge on an electron was determined as -1.60 x 10 -19 coulombs by observing that: a. the charge on all the droplets was a multiple of 1.60 x 10
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CH121-S02-P1A - 1st Practice Exam 1. What is the density of...

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