Bond Energy

In an exothermic reaction, energy is

• absorbed from the surrounding area

• created proportional to the change in mass

• stored in chemical bonds

• released into the surrounding area

The most stable point on in a covalent bond is it's

• Internuclear separation

• Bond Strength

• Bond Length

A single covalent bond is generally more stable than a double bond

• True

• False

What is the difference in Chemical Potential Energy between these two bonds?

The bond energy for bond #1 is

A reaction that separated bond #1 and then recombined as bond #2 would be

• Exothermic

• Endothermic

• Ectothermic

• Octo...thermic?

The energy required to separate the two atoms represented in this graph is the

• Bond Length

• Bond Strength

• Internuclear Separation

How much energy would be needed to separate this atom?

C-H Bond Energy: 413 kJ/mol

• 413 kJ/mol

• 826 kJ/mol

• 1239 kJ/mol

• 1652 kJ/mol

Answer explanation

There are 4 C-H bonds so you need to multiply the bond energy for C-H 4 times

Which of these molecules releases the most energy when formed?

• H₂

• O₂

• N₂

• Trick Question. Molecules absorb energy when they are formed

Answer explanation

N₂ has a triple bond, which is the most stable and therefore has the highest magnitude of bond energy

Food stores energy in the covalent bonds of its molecules

• True

• False

Answer explanation

Energy is never stored in bonds. You need energy to break bonds.