EL 7 (part 2)

Question 1

What is a compound?

Answer 1

Atoms of different elements which are chemically bonded

Question 2

What is ionic bonding?

Answer 2

The electrostatic attraction between oppositely charged ions

Question 3

What is metallic bonding?

Answer 3

The electrostatic attraction between positive metal ions and delocalised electrons

Question 4

What substances have a macro molecular structure?

Answer 4

Polymers

Question 5

What substances have a covalent network structure?

Answer 5

Some elements in group 4 and some of their compounds

Question 6

What substances have a simple molecular structure?

Answer 6

• Some non-metal/non-metal compounds

Question 7

What are the giant lattice structures?

Answer 7

Ionic, covalent network, metallic

Question 8

What are the covalent molecular structures?

Answer 8

Simple molecular and macromolecular

Question 9

Examples of ionic structures

Answer 9

Sodium chloride and calcium oxide

Question 10

Examples of covalent network structures

Answer 10

Diamond, graphite, silica

Question 11

Examples of metallic structures

Answer 11

Sodium, copper, iron

Question 12

Examples of simple molecular structures

Answer 12

CO2, H2O, Cl2

Question 13

Examples of macromolecular structures

Answer 13

Polythene, proteins, DNA

Question 14

What type of particles do ionic structures contain?

Answer 14

Ions

Question 15

What type of particles do covalent network structures contain?

Answer 15

Atoms

Question 16

What type of particles do metallic structures contain?

Answer 16

Positive ions surrounded by delocalised electrons

Question 17

What type of particles do simple molecular structures contain?

Answer 17

Small molecules

Question 18

What type of particles do macromolecular structures contain?

Answer 18

Long-chain molecules

Question 19

How are the particles in an ionic structure bonded together?

Answer 19

Strong ionic bonds between oppositely charged ions

Question 20

How are the particles in covalent network structure bonded together?

Answer 20

Strong covalent bonds

Question 21

How are the particles in a metallic structure bonded together?

Answer 21

Strong metallic bonds

Question 22

How are the particles in simple molecular and macromolecular structures bonded together?

Answer 22

• Weak intermolecular bonds between molecules
• strong covalent bonds between the atoms within molecules

Question 23

What is melting and boiling point like in ionic structures?

Answer 23

High

Question 24

What is melting and boiling point like in covalent network structures?

Answer 24

Very high

Question 25

What is melting and boiling point like in metallic structures?

Answer 25

Generally high (except mercury)

Question 26

What is melting and boiling point like in simple molecular structures?

Answer 26

Low

Question 27

What is melting and boiling point like in macromolecular structures?

Answer 27

Moderate - often decompose on heating

Question 28

What is hardness like in ionic structures?

Answer 28

Hard but brittle

Question 29

What is melting and boiling point like in covalent network structures?

Answer 29

Very hard (if three-dimensional)

Question 30

What is melting and boiling point like in metallic structures?

Answer 30

Hard but malleable

Question 31

What is melting and boiling point like in simple molecular structures?

Answer 31

Soft

Question 32

What is melting and boiling point like in macromolecular structures?

Answer 32

Variable - many are soft but often flexible

Question 33

What is electrical conductivity like in an ionic structure?

Answer 33

Electrolytes only conduct when molten or dissolved in water

Question 34

What is electrical conductivity like in a covalent network structure?

Answer 34

Do not normally conduct - except graphite

Question 35

What is electrical conductivity like in a metallic structure?

Answer 35

Conduct when solid or liquid

Question 36

What is electrical conductivity like in a simple molecular and macromolecular structure?

Answer 36

Do not conduct

Question 37

What is solubility in water like in ionic structures?

Answer 37

Often soluble

Question 38

What is solubility in water like in covalent network structures?

Answer 38

Insoluble

Question 39

What is solubility in water like inmetallic structures?

Answer 39

Insoluble (but some react)

Question 40

What is solubility in water like in simple molecular structures?

Answer 40

Usually insoluble - unless molecules contain groups which can hydrogen bond with water

Question 41

What is solubility in water like in macromolecular structures?

Answer 41

Usually insoluble

Question 42

What is solubility in non-polar solvents like in macromolecular structures?

Answer 42

Sometimes soluble

Question 43

What is solubility in non-polar solvents like in simple molecular structures?

Answer 43

Usually soluble

Question 44

What is solubility in non-polar solvents like in metallic structures?

Answer 44

Insoluble

Question 45

What is solubility in non-polar solvents like in covalent network structures?

Answer 45

Insoluble

Question 46

What is solubility in non-polar solvents like in ionic structures?

Answer 46

Insoluble

Question 47

Why do metals have good electrical conductivity?

Answer 47

Delocalised electrons can move freely

Question 48

Why are metals ductile?

Answer 48

The free movement of delocalised electrons allows atoms on layers to slide past each other