Practice midterm 1 spring 2007

Practice midterm 1 spring 2007 - \ ' Chemistry 142A Seat...

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Unformatted text preview: \ ' Chemistry 142A Seat (1) Name Spring Quarter, 2007 — Exam #1 ‘ Lab/Quiz Section ' . (1) 1 Agril 27, 2007 VERSION B Lab/Quiz TA _ g , =1. (7) Give the correct chemical name or-formula for each of the following chemical compbunds: (a) ci(N03)3 (b) Lithium Nitrite M (0) Ksz04 m— M“— (d) Magnesium Phosphate ' (e) Liclo; _ (t) Sodium Hydrogen Carbonate (g) Pcis M 2. (8) ' What would be the chemical formula of a compound that could be formed by ’ the reaction or combination of the elements below: ~ (If no reaction occurs, or no compound is formed write N.R.) (a) Boron and Oxygen: (b) Helium and Fluorine: (e) Lithium and Phosporous: - (d) Bafium and Bromine: 3. (4) ' What are the molecular formulas for each of the following elements: (a) Fluorine g (b) Phosporous I (c) Sulfur (d) Helium MM Chem 142A — SE}. Qtr., 2007 — Exam #1 ' Page 2 4. (16) Complete and balance'the following chemical and nuclear reactions indicating the ‘ states of the products (g, l, s,‘ aq). If no reaction occurs write N.R. ‘ (a) _ HI(aq) + _ Mg(0H) 2(g) '_> .(b) _'__ H2(g) + __102(g) —>' _’_ C3H8(g) + __ 02(g) '—>- '(d)7 '__(NH‘t)2Cr207(S) K (e), 144Ce ——> B- + +Energy (t) 239Pu+ 3h » -> “03a + + 33n+Energy> ' (g) lgéTa [3+ + __'+__ + Energy .(h) 56Fe+ (in v-—) + Energy 5. (8) Calculate the number of hydrogen atoms-in 1.37 ng of (NH4)3 P04. VERSION B 6..(9) Calculate the binding energy in MeV per nucleon for 1‘5 IEu which has-a mass of 150.919846 amu per atom. ' 7. (9) Calculate the molarity of all of the ions in a solution made by. combining 250.00 ml of a sodium chromate solution with 47.0 g of barium nitrate ' pentahydrate dissolved in 200.00 ml of solution. The sodium chromate Solution was made by dissolving 235.00 g of sodium chromate into sufficient water to make 3.00 liter of solution. Write the chemical equation including states. I VERSION B Chem 142A — Spr. Qtr., 2007 — Exam #1 ' ’ Page 4 8. (9) Calculate the mass of hydrogen cyanide that could be produced by combining 37.00 g of ammonia with 185.00 g of oxygen and 43.00 g of methane in a sealed container and assuming a 90.0% yield. ~ ‘ 2NH3(g) .+ 302(g) + 2CH4(g) —> 2HCN(g) + 6H20(g) 9. (9) Calculate the'empirical and molecular formulas of a compound containing - , C, H and 0 if upon combustion of a 8.15 g sample in an execss of oxygen, 12.16 g of carbon dioxide and 3.73 g of water were produced. (The molecular mass of the compound is approximately 120 g/mole.) - VERSION B Chem 142A ~82}: Qtr., 2007 — Exam #1 f _ Page 5 10. (9) Calculate the percentage composition of each element in 3.50 mg of ’ (NH4)2 Cr;O-, ° 3H20. 12. (5 Bonus Points) The mass of Carbon-13 is 13.0035483 g/mole. Which isotope of earbon has a mass of 13.0035483 amu? Answer VERSION B ...
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This note was uploaded on 03/22/2011 for the course CHEM 142 taught by Professor Zoller,williamh during the Spring '07 term at University of Washington.

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Practice midterm 1 spring 2007 - \ ' Chemistry 142A Seat...

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