bonding

Question 1

Metallic bonding is

Answer 1

strong electrostatic attraction between positive ions and delocalised electrons arranged in a lattice

Question 2

Metallic bonding melting points trends

Answer 2

• decrease down a group
• increase across a period

Question 3

ionic bonding is

Answer 3

strong electrostatic attraction between oppositely charged ions in a lattice

Question 4

do ionic bonds have low or huh melting points

Answer 4

high

Question 5

what is a co-ordinate/dative bond

Answer 5

contains a shared pair of electrons with both electrons supplied by one atom

Question 6

2 bonding pairs name, bond angle, drawing

Answer 6

• linear
• 180

Question 7

3 bonding pairs name, bond angle, drawing

Answer 7

• trigonal planar
• 120

Question 8

4 bonding pairs name, bond angle, drawing

Answer 8

• tetrahedral
• 109.5

Question 9

5 bonding pairs name, bond angle, drawing

Answer 9

• trigonal bipyramidal
• 90 + 120

Question 10

6 bonding pairs name, bond angle, drawing

Answer 10

• octahedral
• 90

Question 11

define electronegativity

Answer 11

ability of an atom to attract a bonding pair of electrons in a covalent bond

Question 12

electron distribution in a covalent bond between elements with different electronegativities will be unsymmetrical. This produces a polar covalent bond, and may cause a molecule to have a permanent dipole.

Question 13

EN predicting

Answer 13

< 0.5 = covalent
0.5-1 = polar covalent
1-1.7 = polar ionic
> 1.7 = ionic

Question 14

Why does water have unusually high melting and boiling points

Answer 14

due to strong hydrogen bonding

Question 15

P and S exist as

Answer 15

P4 and S8