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10 minutes maximum!
An IB Periodic Table is required. |
1. Which statement is true for the formation of a covalent bond?
- A. Metal atoms share electrons with non-metal atoms
- B. Metal atoms transfer electrons to non-metal atoms
- C. Non-metal atoms share electrons with non-metal atoms
- D. Non-metal atoms transfer electrons to metal atoms
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2. Which row in the table below is true for methane, CH4?
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Boiling point |
because ... |
| A |
high |
the C-H bonds in methane are strong |
| B |
high |
methane has strong intermolecular forces |
| C |
low |
the C-H bonds in methane are weak |
| D |
low |
methane has weak intermolecular forces |
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3. A covalent bond is the electrostatic attraction between ...
- A. positive ions and delocalized electrons
- B. a shared pair of electrons and the positively charged nuclei
- C. polar molecules
- D. oppositely charged ions
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4. Which statements listed below are true in moving from S-O to S=O?
| I. Bond strength increases |
| II. Bond length increases |
| III. Number of shared electrons increases |
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- A. I and II only
- B. I and III only
- C. II and III only
- D. I, II and III
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5 Which statement about covalent bonds is NOT true?
- A. Nitrogen atoms share two pairs of electrons in N2
- B. The bonds in O2 are non-polar
- C. The O-H bonds in water are polar
- D. The C=O bond is stronger than the C-O bond
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Q6-7
The electronegativity values of 4 non-metal elements are listed below:
| Element |
W |
X |
Y |
Z |
| Electronegativity |
2.6 |
3.2 |
3.0 |
2.2 |
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6. Which covalent bond is most polar?
- A. Y-X
- B. Z-W
- C. Y-Y
- D. Z-X
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7. Which bond polarity is correctly shown?
- A. δ+W-Xδ-
- B. δ+X-Yδ-
- C. δ+Y-Zδ-
- D. δ+W-Zδ-
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8. Which statement is true?
- A. C≡C bonds share less electron pairs than C=C bonds
- B. C=C bonds are shorter than C-C bonds
- C. C=C bonds are polar
- D. C-C bonds require more energy to break them than C=C bonds
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9. Which bond is least polar?
- A. N-F
- B. C-F
- C. B-F
- D. O-F
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10. Which species contains a coordinate bond?
- A. N2
- B. NH3
- C. CO
- D. CO2
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