121finalreviewquestions

121finalreviewquestions - <?xml version="1.0"...

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1. (5 pts) How many significant figures should there be in the answer to the following? (3.15 x 1.06) + (21 x 1.773) = _____ a) 1 b) 2 c) 3 d) 4 e) 5 2 (5 pts) The quantity 1.0 mg/cm 2 is the same as 1.0 x _____ kg/m 2 . a) 10 -4 b) 10 2 c) 10 -6 d) 10 -2 e) 10 4 3. (7 pts) The density of lead is 11.4 g/cm 3 . The mass of a lead ball with a radius of 0.50 mm is _____ g. ( V sphere = 4πr 3 /3) a) 6.0 b) 4.6 x 10 -2 c) 4.6 x 10 -5 d) 6.0 x 10 -3 e) 4.6 1
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4.(8 pts) Which isotope has 45 neutrons? a) 80 36 Kr b) 80 35 Br c) 78 34 Se d) 34 17 Cl e) 10 3 Rh 5.(5 pts) Which of the following are not subatomic particles? a) x-rays b) protons c) neutrons d) electrons e) all of these are subatomic particles 6. (5 pts) Which pair of elements below should be the most similar in chemical properties? a) N and O b) P and S c) K and Ca d) K and Mg e) Sr and Ba 2
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7. (5 pts) An element in the upper right corner of the periodic table _________. a) is either a metal of metalloid b) is definitely a metal c) is either a metalloid or a non-metal d) is definitely a non-metal e) is definitely a metalloid 8. (5 pts) Elements in Group 6A of the periodic table are known as the ______. a) alkali metals b) chalcogens c) alkaline earth metals d) halogens e) noble gases 9. (5 pts) The formula of zinc phosphate is Zn 3 (PO 4 ) 2 . What is the formula for cadmium arsenate? a) Cd 4 (AsO2) 3 b) Cd 3 (AsO 4 ) 2 c) Cd 3 (AsO 3 ) 4 d) Cd 2 (AsO 4 ) 3 e) Cd 2 (AsO 4 ) 4 10. (5 pts) The name for HIO 2 is ________. a) hypoiodic acid b) hydroiodic acid c) periodous acid d) iodous acid e) hydroiodic acid 3
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11. (7 pts) What is the coefficient of O 2 when the following equation is completed and balanced? C 4 H 8 O 2 + O 2 → _____ a) 2 b) 3 c) 5 d) 6 e) 1 12. (5 pts) Which of following are decomposition reactions? 1. CH 4 (g) + 2O 2 (g) → CO 2 (g) + 2H 2 O (l) 2. CaO(s) + CO 2 (g) → CaCO 3 (s) 3. 2Mg(s) + O 2 (g) → 2MgO(s) 4. PbCO 3 (s) → PbO(s) + CO 2 (g) a) 1, 2, and 3 b) 4 only c) 1, 2, 3, and 4 d) 2 and 3 e) 2, 3, and 4 13. (8 pts) Given the information below, calculate the weighted average atomic mass (amu) of the element X. Isotope Abundance (%) Mass(amu) 221 X 74.22 220.9 220 X 12.78 220.0 218 X 13.00 218.1 a) 219.7 b) 220.4 c) 22042 d) 218.5 e) 221.0 4
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14. (5 pts) A sample of C 3 H 8 O consisting of 200 molecules will yield ___ carbon atoms. a) 600 b) 200 c) 3.61 x 10 26 d) 1.20 x 10 26 e) 4.01 x 10 25 15. (8 pts) Combustion analysis of 1.031 g of a compound containing carbon, hydrogen, and oxygen yielded 2.265 g CO 2 and 1.236 g H 2 O. What is the empirical formula of the compound. a) C
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This note was uploaded on 05/14/2009 for the course CHEM 121 taught by Professor Wyzlouzil during the Fall '07 term at Ohio State.

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121finalreviewquestions - <?xml version="1.0"...

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