Practice Problems for Test Four

Homework #4 Chapter 7 and 9

1. How many electrons are shared in a double covalent bond?
2. 3
3. 4
4. 6
5. 8
6. When electrons are shared equally, this type of bond is known as______
7. Non-polar covalent
8. Polar covalent
9. Ionic
10. None of these
11. Which bond is non-polar covalent?
12. C-O
13. F-F
14. C-H
15. C-S
16. Which of the following bonds would be the most polar?
17. C-O
18. O-O
19. N-O
20. H-H
21. According to periodic trends, which element is the most electronegative?

A. Ne

B. O

C. F

D. C

1. An ionic bond is the attraction between
2. Neutral atoms
3. Neutral ions
4. Oppositely charged ions
5. Similarly charged ions
6. There are ______ unpaired electrons in the Lewis symbol for iodine atom
7. 7
8. 8
9. 1
10. 3
11. There are ______ paired electrons in the Lewis symbol for oxygen atom
12. 6
13. 4
14. 1
15. 16
16. What is the correct Lewis-Dot structure for SO₃?
17. What is the correct Lewis-Dot structure for NCl₃?
18. What is the correct Lewis-Dot structure for SI₆?
19. What is the correct Lewis-Dot structure for BeF₂?
20. What is the molecular shape of BCl₃?
21. Trigonal planar
22. Tetrahedral
23. Linear
24. T-shaped
25. What is the molecular shape of CO₂?
26. Linear
27. Bent
28. Trigonal planar
29. Tetrahedral
30. What is the molecular shape of PCl₅?
31. Trigonal planar
32. Bent
33. Tetrahedral
34. Trigonal bipyramid
35. What is the molecular shape of CH₄?
36. Bent
37. Linear
38. Trigonal planar
39. Tetrahedral
40. A gas has a volume of 2.5L at 24°C, what is the final temperature if the volume increases to 5.2L?
41. 273.2 K
42. 147.1 K
43. 303.2 K
44. 617.8 K
45. The initial pressure of a gas is 0.6 atm with initial volume of 1.1L, what is the final pressure if the final volume of the gas is 0.750L?
46. 1.14 atm
47. 0.88 atm
48. 1.4 atm
49. None of the above
50. A gas of 0.04 moles occupies volume of 0.2L at 296K. What is pressure of the gas?

Gas Constant: R=0.08206 L_*atm/mol_*K

1. 0.2 atm
2. 0.4 atm
3. 4.86 atm
4. 2 atm
5. A sample of gas at 150°C and 730 torr occupies a volume of 3.0L. What volume would this gas occupy at 175°C and 780 torr?
6. 2.97 L
7. 0.33L
8. 3.28L
9. None of the above
10. If you have a 5L balloon originally at 30°C and you increase the temperature to 60°C, what is the new volume?
11. 10.2 L
12. 5.5 L
13. 2.6 L
14. 3.9 L
15. A deep-sea diver’s tank is filled with a mixture of oxygen, nitrogen and argon. If the partial pressure of argon is 3.0atm, the partial pressure of nitrogen is 0.5atm and the partial pressure of oxygen is 0.75atm, what is the total pressure inside the tank?

1. 4.25 atm
2. 5 atm
3. 2 atm
4. 6 atm
5. How many moles of oxygen are there in 10.0 L at 25°C and 1 atm?

1. 1.0 mole
2. 0.4 mole
3. 3.5 moles
4. None of the above
5. What is the density of He(g) at STP (standard temperature and pressure) of 0°C and 760 torr of pressure?
6. 0.5 g/L
7. 0.18 g/L
8. 1.4 g/L
9. 0.8 g/L
10. What is an ideal gas?