Bonding L10

Question 1

Valence Bond Theory

Answer 1

• Combines Lewis’ theory of filling octets by sharing pairs of electrons with the electron configuration of atomic orbitals
• Valence Bond theory states that bonding accuse when atomic orbital overlap

Question 2

Problem with Valence Bond Theory

Answer 2

• Problem= bond angle is wrong

- Solution= Hybrid orbitals

Question 3

single bonds

Answer 3

• able to spin on an axis

- sigma bonds

Question 4

double bonds

Answer 4

• pi bonds prevent sigma bonds from spinning on this axis

Question 5

cis isomers

Answer 5

• similar across top and across bottom

Question 6

trans isomers

Answer 6

similar diagonally

Question 7

sigma vs. pi bonds strength

Answer 7

Sigma bonds are stronger, as they have shorter bond lengths and greater bond energies

Question 8

Bond polarity

Answer 8

• shared electrons spend more time around the most electronegative element in the chemical bond
• This gives the more EN element a slightly negative charge and the less EN element a slightly positive charge

Question 9

dipole moment

Answer 9

when the dipoles don’t cancel out and the molecule is polar

Question 10

Diatomic molecules

Answer 10

• Two diatomic molecules that contain atoms from the same groups in the same proportions
• will have the same shape
• will both be either polar or non-polar