AP®ChemistryCollege BoardExam QuestionsUnit 2: Molecular & Ionic Compound Structure & PropertiesChemical Bonding

Chemical Bonding (College Board AP® Chemistry)

Exam Questions

6 mins6 questions
11 mark

In which of the following pairs is the first element expected to have a higher electronegativity than the second?

  • Li, Be

  • Mg, Sr

  • Be, Al

  • Br, Cl

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21 mark

Which of the following is a non-polar molecule containing polar bonds?

  • CH3-CH3

  • CH3-CF3

  • CH2=CH2

  • CF2=CF2

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31 mark

Which of the following molecules are paired correctly with their property?

  • C2H6, good electrical conductivity

  • CaCl2, low boiling point

  • NH3, poor electrical conductivity

  • CuCl2, insoluble in water

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41 mark

Which statement is true about metallic solids?

  • Atoms are loosely packed into metallic lattices

  • Atoms lose valence electrons to become negative ions in a sea of delocalized electrons

  • Metals are held together by Coulombic forces of attraction between positive ions and delocalized electrons

  • The inner electrons of metal atoms dissociate leading to the formation of metal ions

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51 mark

The diagram below shows the potential energy as two chlorine atoms approach each other.

Graph showing potential energy versus internuclear distance for chlorine atoms forming a chlorine molecule.

As the two chlorine atoms appraoch each other, there is a decrease in energy. This decrease is because

  • two nuclei are more strongly attracted to two electrons because their magnetic fields interact more strongly.

  • the effective nuclear charge increases as the atoms approach each other.

  • the additional attractive force between the two electrons and their opposite nuclei is greater than their repulsive forces.

  • the core shielding by the electrons diminishes as the two nuclei get closer.

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61 mark

Which of the following should be considered when determining the Coulombic force between ions?

I. The charge of the ions

II. The mass of the ions

III. The distance between the ions

  • I only

  • II only

  • I and II only

  • I and III only

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