Bond Length and Bond Energy

Mr. Andersen discusses bond length and bond energy, starting with Kathleen Lonsdale's pioneering work in X-ray crystallography. He explains the forces of attraction and repulsion between atoms, using energy distance graphs to illustrate bond energy and length. The video covers how bond strength is influenced by atomic charges and the number of electrons shared, leading to changes in bond length. The concept of electronegativity and its impact on bond energy is also explored, along with examples of atomic radius affecting bond length. Finally, the video examines how increasing bond numbers, such as moving from single to triple bonds, affects bond energy and length.

Who was the scientist known for measuring some of the first bond lengths?

• Marie Curie

• Kathleen Lonsdale

• Rosalind Franklin

• Dorothy Hodgkin

What causes the attraction between two atoms?

• Electrons of one atom attracting protons of another

• Protons attracting other protons

• Neutrons attracting each other

• Protons of one atom repelling electrons of another

What is bond energy?

• Energy that keeps atoms stationary

• Energy required to form a bond

• Energy required to break a bond

• Energy released when atoms are separated

How does increasing the number of electrons in a bond affect bond strength?

• Makes the bond length longer

• Has no effect on bond strength

• Increases bond strength

• Decreases bond strength

What happens to bond length as bond strength increases?

• Bond length becomes unpredictable

• Bond length decreases

• Bond length increases

• Bond length remains the same

If the bond length between two boron atoms is greater than expected, what does it indicate?

• A strong bond

• A weak bond

• An ionic bond

• No bond at all

How does a triple bond between two carbon atoms affect bond length compared to a single bond?

• Increases bond length

• Makes bond length infinite

• Decreases bond length

• Has no effect on bond length