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ZingPath: Chemical Bonding

Bond Length and Bond Energy

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Chemical Bonding

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Lesson Focus

Bond Length and Bond Energy

Chemistry

Learning Made Easy

You will be able to learn the difference between elements and compounds. Then discover the different types of bonds that hold atoms together and the differences between them.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Understand the concept of bond energy.
  • Understand the concept of bond length.

Everything You'll Have Covered

What is bond length?

~ Bond length is the average distance between the nuclei of two atoms bonded together to form a molecule.

Why are single bonds longer than double or triple bonds?

~ Single bonds have fewer negatively charged electrons shared between two atoms than double or triple bonds, so they don't attract the positively charged nuclei of the atoms as strongly as bonds with more electrons. Double and triple bonds have more electrons, so they exert a stronger attractive force on the nuclei of the bonding atoms, which pulls the atoms closer together and leads to shorter bond lengths.

Define bond energy.

~ Bond energy is a measure of the strength in a chemical bond.

What is the relationship between bond energy and bond length?

~ Short bonds, such as those found in double and triple bonds, have more bond energy than long bonds, such as those found in single bonds-the shorter the bond, the greater the bond energy, and the stronger the bond. Since the bonds in double and triple bonds are shorter than the bonds in single bonds, double and triple bonds have more bond energy and are stronger than single bonds. Single bonds are the longest bonds, but they are also the weakest bonds.

Tutorial Details

Approximate Time 2 Minutes
Pre-requisite Concepts Students should be able to define bond energy, bond length, and bond order.
Course Chemistry
Type of Tutorial Animation
Key Vocabulary bond energy, bond length, bond order