1. In the presence of aqueous I-, Pb2+ forms a yellow precipitate, PbI2
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. In the presence of aqueous I-, Pb2+ forms a yellow precipitate, PbI2
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. Magnesium metal burns in air to produce magnesium oxide.
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. Magnesium metal burns in air to produce magnesium oxide.
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
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? g g g g g

6. Two solutions contain 3. 2 g and 3
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? g g g g 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
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

10. Bromine is a reddish-brown liquid
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

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?
moles
moles
moles
moles
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?
moles
moles
moles
moles
moles

13. 250. 0 mL of 0. 100 M HCl is required for a particular experiment. A 2
250.0 mL of 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?
x10-3 mL mL mL mL mL

14. 250. 0 mL of 0. 100 M HCl is required for a particular experiment. A 2
250.0 mL of 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?
x10-3 mL mL mL mL mL

15. It was found that 10.0 mL of M HCl was required to titrate a 20.0 mL aliquot of NaOH. What is the concentration of the sodium hydroxide solution? M M M M M

16. It was found that 10.0 mL of M HCl was required to titrate a 20.0 mL aliquot of NaOH. What is the concentration of the sodium hydroxide solution? M M M M 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 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 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. weakly
reducing
strongly
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. weakly
reducing
strongly
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 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?
x10-4 M M M
x10-4 M M

28. The reaction occurring during the titration of oxalic acid (H2C2O4) with permanganate ion (MnO4-) is as follows,
In the titration of 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?
x10-4 M M M
x10-4 M M

29. Hydrocarbons are composed of just the elements carbon and hydrogen
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
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?
37,000 20
20,000
cannot be determined

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

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

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

35. Which weighs more, a pea or a marble?

36. Which weighs more, a pea or a marble?

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

38. Which has more atoms, 10.0 g Mg or 10.0 g Ca?
24.30
40.08
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. Determine the oxidation number of the red element in each of the following compounds:
H2PO4– SO32– N2O4

42. Determine the oxidation number of the red element in each of the following compounds:
H2PO4– SO32– N2O4