Bond Length and Energy Concepts

This video tutorial by Mr. Anderson covers the concepts of bond length and bond energy in chemistry. It begins with a historical reference to Cathleen Lonsdale's work in x-ray crystallography, which helped measure bond lengths. The video explains the forces of attraction and repulsion between atoms, using energy distance graphs to illustrate bond energy and length. It discusses how bond strength is influenced by atomic charges and the number of electrons shared. Examples with hydrogen, boron, and arenium demonstrate calculations of bond length and energy. The tutorial concludes by examining how increasing bond numbers affect bond length and energy, using ethane and acetylene as examples.

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

• Marie Curie

• Rosalind Franklin

• Dorothy Hodgkin

• Cathleen Lonsdale

What causes the attraction between two atoms?

• Protons attracting each other

• Protons of one atom repelling electrons of another

• Electrons of one atom attracting protons of another

• Neutrons attracting each other

How is bond energy defined?

• Energy released when atoms are separated

• Energy required to form a bond

• Energy required to break a bond

• Energy released when atoms are bonded

What happens to bond length as bond strength increases?

• Bond length increases

• Bond length decreases

• Bond length remains the same

• Bond length fluctuates

What is the bond length of a boron-boron bond expected to be if the atomic radius is 83 pm?

• 83 pm

• 332 pm

• 166 pm

• 249 pm

What is the relationship between bond number and bond length?

• As bond number increases, bond length decreases

• As bond number increases, bond length increases

• Bond number and bond length are unrelated

• Bond number does not affect bond length

Which molecule has a triple bond between carbon atoms?

• Acetylene

• Methane

• Ethane

• Propane

What happens to bond energy as the number of bonds increases?

• Bond energy fluctuates

• Bond energy remains constant

• Bond energy increases

• Bond energy decreases

Which of the following is true about the bond length of nitrogen with increasing bond number?

• Bond length decreases

• Bond length remains the same

• Bond length increases

• Bond length fluctuates

What is the effect of increasing the number of electrons in a bond?

• Increases bond strength

• Increases bond length

• Decreases bond strength

• Has no effect on bond strength