Structure And Bonding

Question 1

Ionic bond

Answer 1

The strong electrostatic attraction between oppositely charged ions

Question 2

When does ionic bonding occur

Answer 2

Between metals and non metals

Question 3

Why do ionic compounds have high melting and boiling points

Answer 3

The strong electrostatic attraction between oppositely charged ions require a lot of energy to break

Question 4

When can ionic compounds conduct electricity

Answer 4

When molten or in solution

Question 5

Why can’t ionic compounds conduct electricity when solid

Answer 5

The IONS are fixed in position and not free to move around

Question 6

Why can ionic compounds conduct electricity when molten or in solution

Answer 6

The IONS are free to move around

Question 7

Ionic compounds structure

Answer 7

Giant ionic lattice structure

Question 8

Covalent bond

Answer 8

The electrostatic attraction between two positive nuclei and a shared pair of electrons

Question 9

Compound

Answer 9

A substance formed from two or more elements, chemically combined

Question 10

Simple covalent structure

Answer 10

Covalent molecules that contain only a few atoms

Question 11

Simple covalent structure bonding

Answer 11

Week forces of attraction between molecules and are easy to overcome

Question 12

Properties of simple molecular structures

Answer 12

Fixed amount, Low melting and boiling points, weak forces of attraction, brittle, can’t conduct electricity,

Question 13

Why can’t simple molecular structures conduct electricity

Answer 13

There are no mobile electrons or ions to carry a charge

Question 14

Why is diamond hard

Answer 14

Each carbon atom forms four bonds to other carbon atoms in a giant tetrahedral lattice structure

Question 15

Why is graphite soft and slippery

Answer 15

There are weak forces of attraction between the layers so they can slide over each

Question 16

Why can graphite conduct electricity

Answer 16

It has mobile electrons that are free to move through the structure

Question 17

Why can’t diamond conduct electricity

Answer 17

There are no delocalised electrons that are free to move

Question 18

C60 structure

Answer 18

Simple molecular structure

Question 19

C60 bonding

Answer 19

Strong covalent bonds and weak intermolecular forces of attraction

Question 20

C60 energy

Answer 20

Little energy is needed to overcome the weak intermolecular forces

Question 21

Why can’t C60 conduct electricity

Answer 21

Delocalised electrons can move within a molecule, but can’t jump from molecule to molecule

Question 22

Why is C60 slippery

Answer 22

Weak intermolecular forces of attraction between the layers

Question 23

Metallic bonding

Answer 23

Strong electrostatic attraction between layers of positive metal ions and the sea of mobile delocalised electrons

Question 24

General properties of most metals

Answer 24

Conduct electricity, malleable, high melting and boiling points

Question 25

Why do metals conduct electricity

Answer 25

The delocalised electrons are mobile

Question 26

Why are metals malleable

Answer 26

The layers of metal ions are able to slide over each other because of the weak forces of attraction between them

Question 27

why do simple molecular substances have low melting and boiling points

Answer 27

the intermolecular forces are very weak so don’t require a lot of energy to overcome

Question 28

what are simple molecular substances at room temperature

Answer 28

liquid, gas or an easily melted solid

Question 29

in simple molecular substances, why are the intermolecular forces stronger between molecules with a high relative molecular mass

Answer 29

there are more points along the larger molecules for intermolecular forces to act between them, so more energy is needed to break the forces.

Question 30

what do molecules with a high relative molecular mass have

Answer 30

higher melting and boiling points because of the strong intermolecular forces that require lots of energy to break

Question 31

why do giant covalent lattice structures have high melting and boiling points

Answer 31

The strong covalent bonds require lots of energy to BREAK

Question 32

Metal structure

Answer 32

Giant metallic lattice of positive ions and a sea of delocalised electrons

Question 33

Malleable

Answer 33

Can be hammered into different shapes and positions

Question 34

Diamond and graphite structure

Answer 34

Giant covalent lattice structure

Question 35

Metallic bonding between

Answer 35

Metal and metal

Question 36

Ductile

Answer 36

Can be drawn into a wire

Question 37

why don’t covalent compounds conduct electricity

Answer 37

they don’t contain charged particles

Question 38

covalent bonding between

Answer 38

non metal and non metal

Question 39

When do you have a simple molecular substance

Answer 39

Atoms that are joined by strong covalent bonds that make a molecule. The forces of attraction between the molecules are weak.