Short essay questions 1. What are the sources
of repulsions and attractions in the hydrogen molecule. Give answer
in terms of nuclei
and valence electrons.
2. What is the origin
of the octet rule? Is it universally followed? If any exceptions
exist, what causes them?
3. Give the names for
the following compounds. HCl, PCl5,
NO2, Cl2O5, CO, CO2, N2O4,
SO3 What does the term
binary compound mean?
4. Draw the Lewis dot
formula for HNO3. Identify the central atom and any multiple bonds. What is the shape
around the central atom in HNO3? give bond angles Indicate the polarity
of bonds using +---> arrows .
Multiple choice 1. Which of the following
pairs of atoms will form a single covalent bond. a. Na and Cl b. He and He c. Ne and He d. N and O
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2. |
Which of the following molecules contains exactly 24 valence electrons? |
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a. NO |
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b. NO2 |
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c. CO2 |
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d. SO3 |
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3. |
Which of the following pairs of atoms can form a double bond? |
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a. He and He |
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b. H and H |
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c. N and H |
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d. N and O |
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5. |
Which of the following pairs of names and symbols is incorrect? |
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a. silicon tetrafluoride, SiF |
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b. nitrogen dioxide, NO2 |
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c. phosphorus trichloride, PCl3 |
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d. phosphorus pentachloride, PCl3 |
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6. |
Which of the following sets of elements normally exists as diatomic molecules? |
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a. nitrogen, neon, helium, oxygen |
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b. nitrogen, oxygen, chlorine, fluorine |
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c. helium, neon, argon |
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d. sodium, calcium, zinc |
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7. |
Which of the following molecules is the most polar? |
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a. hydrogen chloride, HCl |
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b. hydrogen iodide, HI |
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c. hydrogen, H2 |
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d. chlorine, Cl2 |
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8. |
Which of the following molecules contains a multiple bond? |
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a. methane, CH4 |
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b. nitrogen, N2 |
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c. hydrogen, H2 |
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d. chlorine, Cl2 |
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9. |
The smallest possible unit of a covalent compound is usually considered to be a(an) |
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a. atom |
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b. cation |
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c. molecule |
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d. polyatomic ion |
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10. |
The systematic name for ICl3 |
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a. iodate trichloride |
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b. iodine trichlorine |
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c. iridium trichloride |
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d. triiodinechloride |
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11. |
A double bond exists when two atoms share ______ electrons. |
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a. two |
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b. three |
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c. four |
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d. six |
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12. |
Carbon dioxide is a linear molecule. The electronegativity of carbon is 2.5. The electronegativity |
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of oxygen is 3.5. The bond between C and O is considered to be |
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a. nonpolar |
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b. polar |
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c. ionic |
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d. weak |
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13. |
Water molecules are polar. This is only possible if the molecule is_________________ |
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a. linear |
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b. tetrahedral |
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c. bent |
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d. pyramidal |