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exam1set1 - ,9~EHISTRY 121 FAll 2003 ~ COMMON EXAM#1 Page-1...

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Unformatted text preview: ,9~EHISTRY 121-- FAll 2003 ~- COMMON EXAM #1 Page-1- PART A {16 multiple choice questions wor~h 4 po~nt each; 20 minutes} 1. 2 . 3 . 4. 5. a. b. The formula for ammonium sulfate is 90y. Given the nuclear symbol for an isotope of yttrium: protons does this isotope have? c. d. NH4{SD4}2 NH4(S04)3 {NH4)2S04 (NH4) 38°4 Hm" many One way to definitely show that gasoline is a mixture of substances would be to b. c. d. a. measure its density burn it filter it measure the temperature during boiling Commercial nitric acid is 70% by mass ENO] and has a density of 1.42 g/mL. Calculate the volume of commercial nitric acid that can be produced from 120 pounds of EN03- (2.2 Ibs= 1000 g; 1 L = 1000 roL) If the average velocity of a nitrogen molecule at room temperature is 5.10 x 102 meter/see, calculate the velocity in miles/hr. (Note: 1.609 km = 1 mile) a. b. c. d. 1.94 19.0 1.14 x 103 1.67 x 103 a. 39 b. 51 c. 90 d. 129 a. 38 L b. 55 L c. 85 L d. 130 L ::lo1ISTRY121 nfALl 2003-- COMMON EXAM#1 6. 7. 8. Page-2- The combination of. numbers and symbols in 5 N2 stands for a. b. 5 nitrogen molecules 5 nitrogen atoms 10 nitrogen molecules 10 separate.nitrogen atoms c. d. When the calculation [15.43 x 4.640 + 0.21 J is carried out I the number of significant figuresin the answer is a. b. c. d. 2 3 4 5 A compound with the formula CaH2 would be called a....
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exam1set1 - ,9~EHISTRY 121 FAll 2003 ~ COMMON EXAM#1 Page-1...

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