Worksheet: Energy Changes in Reactions

In this worksheet, we will practice calculating net change in bond energy during a reaction from the energies of bonds in the reactants and products.

Q1:

The change in energy during a chemical reaction may be explained in terms of electrostatic interactions between subatomic particles. Which of the following best describes the change in energy when a covalent bond is formed?

  • ABond formation absorbs energy due to increased electrostatic attraction between protons and electrons.
  • BBond formation releases energy due to increased electrostatic attraction between protons.
  • CBond formation releases energy due to increased electrostatic attraction between protons and electrons.
  • DBond formation releases energy due to increased electrostatic repulsion between protons.
  • EBond formation absorbs energy due to increased electrostatic repulsion between protons and electrons.

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