Bond Energy

Bond energy is the amount of energy required to break a chemical bond, thereby forming natural elements. Now bond energies are usually measured between elements while in a gaseous state.

Bond energy is often expressed as the amount of energy required to break one mole of the compounds in the elements.

Mini-test: BOND ENERGY 

Question 1: Bond energy is the amount of energy
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Question 2: If the bond energy for HCl is 430 kJ/mol, what is the bond energy of 4 moles of HCl
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The next lesson: Ionic Bonds, both lessons are included in Practice Tests.

The following transcript is provided for your convenience.

What you have is the elements combined together from compounds and so it takes a certain amount of energy to break those compounds back up into its original element and so bond energy is a measure of the amount of energy it takes to break those compounds back into the original elements. Now bonds with low energy are easier to form and to break, so low energy equals easy to form and break.

When you think about the compounds, first the elements have to be formed in those compounds and then we’re looking at bond energy, which is the amount of energy it takes to break those compounds back into elements. There’s a low amount of energy, it’s easy to take those elements and form them into compounds and it’s easy to break those compounds back up in elements.

Now high energy has basically just the opposite effect of low energy. High energy equals difficult to form and break. Compounds that have a high energy are going to have a higher bond energy and compounds have a lower energy, are going to have a lower bond energy because high energy and low energy play a large role in determining how large the bond energy needs to be.

The next lesson: Ionic Bonds, both lessons are included in Practice Tests.

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