Chapter 6

Question 1

What is the bond angle and the shape of a molecule with 2 electron pairs around the central atom

Answer 1

Linear, 180°

Question 2

What is the bond angle and the shape of a molecule with 3 electron pairs around the central atom

Answer 2

Trigonal planar, 120°

Question 3

What is the bond angle and the shape of a molecule with 4 electron pairs around the central atom

Answer 3

Tetrahedral, 109.5

Question 4

What is the bond angle and the shape of a molecule with 5 electron pairs around the central atom

Answer 4

Trigonal bipyramidal, 120°, 90°

Question 5

What is the bond angle and the shape of a molecule with 6 electron pairs around the central atom

Answer 5

Octahedral, 90°

Question 6

What is the bond angle and the shape of a molecule with 4 electron pairs and 1 lone pair around the central atom

Answer 6

Pyramidal, 107°

Question 7

What is the bond angle and the shape of a molecule with 4 electron pairs and 2 lone pair around the central atom

Answer 7

Non-linear, 104.5°

Question 8

Define electronegativity

Answer 8

Is a measure of the ability of an atom in a molecule to attract a pair of electrons in a covalent bond to itself

Question 9

What is the trend in electronegativity

Answer 9

Increases across a period and up a group on the Periodic table towards F

Question 10

How can a molecule be polar

Answer 10

Dipoles for not cancel out (molecule is not symmetrical)

Question 11

Describe the London forces

Answer 11

1. Electrons in an atom or molecule are constantly moving
2. A temporary uneven distribution of electrons can occur for an instant (temporary dipole)
3. The instantaneous dipole induces a dipole in its neighbours
4. Leading to an attraction

Question 12

What types of lattices do molecules with only London forces form?

Answer 12

Simple molecular

Question 13

What is hydrogen bonding

Answer 13

Occurs between molecules containing N, O or F with H. Strongest imf