1996 - U.S National Chemistry Olympiad 1996 Local Section Test Go to Answers 1 Which gas is both diatomic and colored(A carbon monoxide(B chlorine(C

1996 - U.S National Chemistry Olympiad 1996 Local Section...

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U.S. National Chemistry Olympiad: 1996 Local Section TestGo to Answers 1. Which gas is both diatomic and colored? (A) carbon monoxide (B) chlorine (C) nitrogen dioxide (D) oxygen 2. Which formula represents a peroxide? 3. Which statement about the halogen family is true? 4. All of these substances are important industrial reducing agents except 5. What is the general formula for the alkali metal hydrides? (A) MH (B) MOH (C) MH2(D) M(OH)2 6. Each of three samples was weighed on a different balance. The masses of the three are 1.028 kg, 82.9 g, and 45.1 mg. The sum of the three masses should be reported as
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7. Magnetite, Fe3O4, is a mixture of iron(II) oxide and iron(III) oxide. What is the most likely ratio of iron(II) oxide to iron(III) oxide in magnetite? 8. A student wishes to prepare 250.mL of a 0.200 M solution of Na2SO4. Which of these procedures should be followed? Substance Molar Mass Na2SO4142 g mol¯1 9. How many moles of ozone, O3, could be formed from 48.0 g of oxygen gas, O2? (A) 1.00 mol (B) 1.30 mol (C) 1.50 mol (D) 2.00 mol 10. How many grams of carbon are present in 0.50 mol of sucrose (C12H22O11)? Substance Molar Mass C12H22O11342 g mol¯1
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11. If excess Ca(OH)2is treated with 0.160 mol of dry HCl gas, what is the maximum number of grams of CaCl2that could be formed? Substance Molar Mass Ca(OH)274.1 g mol¯1 12. What volume of 0.500 M CaCl2solution is needed to prepare 250 mL of solution that has a chloride concentration of 0.100 M? (A) 12.5 mL (B) 25.0 mL (C) 50.0 mL (D) 100 mL
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  • Spring '08
  • rogers
  • Atom, Chemical reaction, Ion, Oxide

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