Chemical Bonding Test


True/False

  1. A double bond involves two pairs of electrons.


  2. N2 is an example of a compound with a triple bond.


  3. Hydrogen bonding results in high heats of vaporization.


  4. Separated atoms have less energy than the same atoms when bonded.


  5. Ions tend to have the same electron configuration as noble gases.


  6. Covalent bonds involve sharing electrons.


  7. HF has a lower boiling point than HCl or HBr.


  8. Carbon atoms tend to hybridize to make four bonds.


  9. A triple bond involves three and only three electrons.


  10. An unpaired electron gives a great deal of reactivity to a molecule.

Multiple Choice (Choose the best answer.)


  1. Which of the statements about ionic solids is FALSE?

    Ionic solids conduct electricity when dissolved in water.

    Ionic solids have high melting temperatures.

    Ionic solids are good conductors of electricity.

    Ionic solids can be formed by reacting an alkali metal with a halogen.

    Ionic solids form crystals.


  2. Which of the pairs of elements listed will NOT form an ionic solid?

    barium and iodine

    calcium and oxygen

    lithium and chlorine

    oxygen and hydrogen

    cesium and fluorine


  3. Which combination(s) is/are most likely to form predominantly covalent bonds?

    Potassium-Chlorine

    Oxygen-Oxygen

    Hydrogen-Carbon

    More than one of the above

    None of the above


  4. Which combination(s)is/are most likely to form predominantly ionic bonds?

    Potassium-Chlorine

    Oxygen-Oxygen

    Hydrogen-Carbon

    More than one of the above /P>

    None of the above


  5. What combinations of two elements from the list V - Z are most likely to form an ionic solid?

    V and W

    X and Z

    Y and Z

    X and Y

    V and Y


  6. What is the empirical formula for a compound formed by the combination of V and X?

    VX

    V2X3

    V3X

    V3X2

    VX3


  7. What is the empirical formula formed by combining X and Z?

    XZ

    X3Z

    XZ3

    X2Z

    X7Z5


  8. Which of the statements given concerning chemical bonding is FALSE?

    Energy is required to break any chemical bond.

    Energy must be released if two atoms are to form a chemical bond.

    A chemical bond occurs only if the potential energy is lowered.

    All chemical reactions require a transfer of electrons in forming new bonds.

    Chemical bonds are due to electrostatic forces of attraction and repulsion.


  9. Which of the following compounds would not be expected to have hydrogen bonding between molecules in the liquid or solid?

    NH3

    HCOOH

    H2

    HF

    H2O


  10. Which of the following electron dot diagrams is incorrect?

 

Problem Solving (Show All Work. Use significant figures.)

1. Draw a valance orbital diagram, an electron dot diagram, a 3-D drawing, and a structural formula showing the bonding in HClO.


Will HClO molecules hydrogen bond to each other? Explain.


2. Using the electron dot-method, show a neutral OCl molecule and an OCl- ion. Which is more reactive? Why?

3. Draw an electron dot diagram of NO2-.

 

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