EX1_SUMMER 2010 with key

EX1_SUMMER 2010 with key - Exam 1 C111 Summer 2010 Name...

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Exam 1 C111 Summer 2010       Name _______________________ Multiple choice , 4 points each. Circle the letter of the best response for each question. PARTIAL CREDIT MAY BE AWARDED IF SOME WORK OR COMMENT IS SHOWN. Avogadro’s Number N = 6.023 x 10 23 1. On a dog-sledding trip in Quebec, the temperature was - 43 o C . What is this temperature in Kelvins? a) 316 K b) 230 K c) 350 K d) 196 K 2. The density of a particular alloy of gold is 18.88 g/cm 3 . What is the volume of a block of this alloy having a mass of 0.5074 g? a) 9.58 cm 3 b) 0.104 cm 3 c) 3.72 cm 3 d) 2.69 x 10 - 2 cm 3 3. Choose the answer, using the correct number of significant figures, when the following calculation is performed: (1.196 x 10 - 3 )( 17.00) = ? (All of the choices are calculated correctly.) 4. How many moles are there in 4.15 x 10 - 2 g of lead, Pb (Z = 82)? 5. 0.00214 milliliters is how many microliters ( μ L)? 6. There are exactly 8 oz. in a cup, and exactly 2 cups in a pint. If 1.00 ounce = 29.6 mL, how many liters are there in a pint? a) 3.79 L b) 2.11 L c) 1.06 L d) 0.474 L e) 0.264 L
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7. For the chemist, accuracy is best defined as: 8. A particular chemical reaction had a theoretical yield of 0.8462 g of product. If only 0.5429 g of product were actually obtained, what is the percent yield of the reaction? 9. A stream of sub-atomic particles escapes through a tiny hole in a lead box. The particle beam is passed between electrically charged plates, as illustrated. A sheet of target material shows the locations where the particles strike. Three regions of impact are observed, indicated by the letters A, B and C in the drawing. Which of the following statements best explains this observation? little of the atom's volume. Particle travel at very different velocities. ( - ) target
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