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Which of the following is a physical observation?

Which of the following is a physical observation?. 1. burns in oxygen. 2. melts at 76 o C. 3. forms a white precipitate. 4. decomposes in air. 5. cooks at high temperature. In the presence of aqueous I - , Pb 2+ forms a yellow precipitate, PbI 2.

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Which of the following is a physical observation?

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  1. Which of the following is a physical observation? 1. burns in oxygen 2. melts at 76 oC 3. forms a white precipitate 4. decomposes in air 5. cooks at high temperature In the presence of aqueous I-, Pb2+ forms a yellow precipitate, PbI2

  2. Which of the following is a physical observation? 1. burns in oxygen 2. melts at 76 oC 3. forms a white precipitate 4. decomposes in air 5. cooks at high temperature In the presence of aqueous I-, Pb2+ forms a yellow precipitate, PbI2

  3. Which of the following is an observation of a chemical property? 1. orange crystal 2. boils at 112 oC 3. smells like mint 4. ignites in water 5. shatters when hammered Magnesium metal burns in air to produce magnesium oxide.

  4. Which of the following is an observation of a chemical property? 1. orange crystal 2. boils at 112 oC 3. smells like mint 4. ignites in water 5. shatters when hammered Magnesium metal burns in air to produce magnesium oxide.

  5. Solutions containing 3.2 g and 3.3 g of Hg(NO3)2 and KI, respectively (which amounts to 10 mmol and 20 mmol, respectively). The two components were separated and dried. The mass of KNO3 was determined to be 2.0 g (ie. 20 mmol). What mass of HgI2 was produced? 1. 9.0 g 4. 2.8 g 2. 4.5 g 5. 1.4 g 3. 4.0 g

  6. Two solutions contain 3.2 g and 3.3 g of Hg(NO3)2 and KI, respectively (which amounts to 10 mmol and 20 mmol, respectively). The two components were separated and dried. The mass of KNO3 was determined to be 2.0 g (ie. 20 mmol). What mass of HgI2 was produced? 1. 9.0 g 4. 2.8 g 2. 4.5 g 5. 1.4 g 3. 4.0 g

  7. Red phosphorus is an allotrope of phosphorus which can be made by heating white phosphorus to temperatures above 240 oC. The most common isotope of phosphorus can be represented by How many protons, electrons and neutrons does this isotope have? 1. 16, 16, 15 2. 15, 15, 1 3. 15, 15, 16 4. 16, 16, 31 5. 16, 16, 1

  8. Red phosphorus is an allotrope of phosphorus which can be made by heating white phosphorus to temperatures above 240 oC. The most common isotope of phosphorus can be represented by How many protons, electrons and neutrons does this isotope have? 1. 16, 16, 15 2. 15, 15, 1 3. 15, 15, 16 4. 16, 16, 31 5. 16, 16, 1

  9. Bromine is a reddish-brown liquid. The atoms are composed of two isotopes with abundances and masses given below the figure. The average atomic mass of bromine is 1. 79.90 4. 79.99 2. 79.92 5. 78.91 3. 79.93

  10. Bromine is a reddish-brown liquid. The atoms are composed of two isotopes with abundances and masses given below the figure. The average atomic mass of bromine is 1. 79.90 4. 79.99 2. 79.92 5. 78.92 3. 79.93

  11. Depicted to the right is the reaction of calcium with water to form calcium hydroxide and hydrogen. If one mole of calcium is reacted with one mole of water, how many moles of calcium hydroxide will be formed? 1. 0.25 moles 4. 1.0 moles 2. 0.33 moles 5. 1.5 moles 3. 0.50 moles

  12. Depicted to the right is the reaction of calcium with water to form calcium hydroxide and hydrogen. If one mole of calcium is reacted with one mole of water, how many moles of calcium hydroxide will be formed? 1. 0.25 moles 4. 1.0 moles 2. 0.33 moles 5. 1.5 moles 3. 0.50 moles

  13. 250.0 mL of 0.100 M HCl is required for a particular experiment. A 2.50 M stock solution is available. What volume of stock solution is needed to prepare the required HCl solution? 1. 1.00x10-3 mL 2. 10.0 mL 3. 12.5 mL 4. 100 mL 5. 6250 mL

  14. 250.0 mL of 0.100 M HCl is required for a particular experiment. A 2.50 M stock solution is available. What volume of stock solution is needed to prepare the required HCl solution? 1. 1.00x10-3 mL 2. 10.0 mL 3. 12.5 mL 4. 100 mL 5. 6250 mL

  15. It was found that 10.0 mL of 0.100 M HCl was required to titrate a 20.0 mL aliquot of NaOH. What is the concentration of the sodium hydroxide solution? • 0.0500 M 4. 0.200 M 2. 0.100 M 5. 0.250 M 3. 0.150 M

  16. It was found that 10.0 mL of 0.100 M HCl was required to titrate a 20.0 mL aliquot of NaOH. What is the concentration of the sodium hydroxide solution? • 0.0500 M 4. 0.200 M 2. 0.100 M 5. 0.250 M 3. 0.150 M

  17. A compound is found to consist of C, H and O in abundances, by mass, of 40.0, 6.7, and 53.3 percent respectively. A mass spectrum revealed that the compound’s molecular mass was 90.08 amu. What is the molecular formula of the compound? 1. CH2O 4. C3H6O3 2. C2H4O2 5. C4H10O2 3. C2H2O4

  18. A compound is found to consist of C, H and O in abundances, by mass, of 40.0, 6.7, and 53.3 percent respectively. A mass spectrum revealed that the compound’s molecular mass was 90.08 amu. What is the molecular formula of the compound? 1. CH2O 4. C3H6O3 2. C2H4O2 5. C4H10O2 3. C2H2O4

  19. Which of the following pairs of solutions, when mixed, will form a precipitate? 1. NaCl(aq) + KNO3(aq) 2. NH3Br(aq) + CaSO4(aq) 3. BaCl2(aq) + NaOH(aq) 4. AgNO3(aq) + LiClO4(aq) 5. MgBr2(aq) + AlCl3(aq)

  20. Which of the following pairs of solutions, when mixed, will form a precipitate? 1. NaCl(aq) + KNO3(aq) 2. NH3Br(aq) + CaSO4(aq) 3. BaCl2(aq) + NaOH(aq) 4. AgNO3(aq) + LiClO4(aq) 5. MgBr2(aq) + AlCl3(aq)

  21. When methane is burned in oxygen the product containing the carbon atom is carbon dioxide. The oxidation numbers of the carbon atoms in methane and carbon dioxide, respectively, are 1. +4, -4 4. -2, +4 2. +2, -2 5. -4, +4 3. -1, +2

  22. When methane is burned in oxygen the product containing the carbon atom is carbon dioxide. The oxidation numbers of the carbon atoms in methane and carbon dioxide, respectively, are 1. +4, -4 4. -2, +4 2. +2, -2 5. -4, +4 3. -1, +2

  23. The rusting of iron is a redox reaction where iron is oxidized and changes oxidation states from 0 to 3. Which of the following reactions is not an oxidation reaction?

  24. The rusting of iron is a redox reaction where iron is oxidized and changes oxidation states from 0 to 3. Which of the following reactions is not an oxidation reaction?

  25. strongly reducing weakly reducing Silver cation will oxidize copper becoming solid silver and liberating copper (II) ions. Looking at the diagram to the left, which one of the four reactions below will occur?

  26. strongly reducing weakly reducing Silver cation will oxidize copper becoming solid silver and liberating copper (II) ions. Looking at the diagram to the left, which one of the four reactions below will occur?

  27. The reaction occurring during the titration of oxalic acid (H2C2O4) with permanganate ion (MnO4-) is as follows, In the titration of 0.0117 mol of the oxalic acid primary standard it was found that 18.5 mL of permanganate solution was required to reach the light purple endpoint. What is the concentration of the permanganate solution? 1. 2.53x10-4 M 3. 0.253 M 5. 1.58 M 2. 6.32x10-4 M 4. 0.632 M

  28. The reaction occurring during the titration of oxalic acid (H2C2O4) with permanganate ion (MnO4-) is as follows, In the titration of 0.0117 mol of the oxalic acid primary standard it was found that 18.5 mL of permanganate solution was required to reach the light purple endpoint. What is the concentration of the permanganate solution? 1. 2.53x10-4 M 3. 0.253 M 5. 1.58 M 2. 6.32x10-4 M 4. 0.632 M

  29. Hydrocarbons are composed of just the elements carbon and hydrogen. Which of the following compounds has all single bonds? • naphthalene, C10H8 • propane, C3H8 • ethyne, C2H2 • ethene, C2H4

  30. Hydrocarbons are composed of just the elements carbon and hydrogen. Which of the following compounds has all single bonds? • naphthalene, C10H8 • propane, C3H8 • ethyne, C2H2 • ethene, C2H4

  31. How many neutrons are in 1000 atoms of Cl-37? • 37 • 37,000 • 20 • 20,000 • cannot be determined

  32. How many neutrons are in 1000 atoms of Cl-37? • 37 • 37,000 • 20 • 20,000 • cannot be determined

  33. 68.9 amu, 60.1 % 71.9 amu, 39.9 % The mass spectrum of gallium, Ga, is shown below. The atomic mass of Ga is 69.7 amu. Which of the following statements is correct? • The atomic mass of Ga will be closer to 69 than 71 because there are more atoms that weigh 68.9 amu. • All Ga atoms weigh 69.7 amu. • The atomic mass of Ga is the average of 68.9 and 71.9.

  34. 68.9 amu, 60.1 % 71.9 amu, 39.9 % The mass spectrum of gallium, Ga, is shown below. The atomic mass of Ga is 69.7 amu. Which of the following statements is correct? • The atomic mass of Ga will be closer to 69 than 71 because there are more atoms that weigh 68.9 amu. • All Ga atoms weigh 69.7 amu. • The atomic mass of Ga is the average of 68.9 and 71.9.

  35. Which weighs more, a pea or a marble? • Pea • Marble

  36. Which weighs more, a pea or a marble? • Pea • Marble

  37. 24.30 40.08 Which has more atoms, 10.0 g Mg or 10.0 g Ca? • Magnesium • Calcium • Both have the same number of atoms.

  38. 24.30 40.08 Which has more atoms, 10.0 g Mg or 10.0 g Ca? • Magnesium • Calcium • Both have the same number of atoms.

  39. Aqueous solutions of which of the following would conduct electricity? • AgNO3 • C11H22O11 (sucrose: table sugar) • CH3CH2OH (ethanol) • O2 • All of the above • None of the above

  40. Aqueous solutions of which of the following would conduct electricity? • AgNO3 • C11H22O11 (sucrose: table sugar) • CH3CH2OH (ethanol) • O2 • All of the above • None of the above

  41. H2PO4–SO32–N2O4 Determine the oxidation number of the red element in each of the following compounds: • + 6 + 6 + 4 • + 5 + 2 + 4 • + 5 + 4 + 4 • + 5 + 4 + 8 • + 6 + 4 + 4

  42. H2PO4–SO32–N2O4 Determine the oxidation number of the red element in each of the following compounds: • + 6 + 6 + 4 • + 5 + 2 + 4 • + 5 + 4 + 4 • + 5 + 4 + 8 • + 6 + 4 + 4

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