bonding and structure

Question 1

what is ionic bonding

Answer 1

electrostatic attraction between positive and negative ions

Question 2

how are ionic compounds held together

Answer 2

giant lattice
electrostatic between positive and negative ions holds structure together

Question 3

properties of ionic substances

Answer 3

high melting points
do not conduct electricity when solid
conduct when molten or dissolved

Question 4

what is a covalent bond

Answer 4

shared pair of electrons between 2 atoms
usually both non metal

Question 5

structures of simple covalent

Answer 5

small molecules

Question 6

c

Answer 6

don’t conduct electricity
low melting and boiling
weak intermolecular forces

Question 7

what is a polymer

Answer 7

very larger molecules with atoms linked by covalent bonds

Question 8

what are giant covalent substances

Answer 8

atoms bonded together in a giant lattice

Question 9

example of giant covalent substances

Answer 9

diamond
graphite
silicon dioxide

Question 10

properties of diamond

Answer 10

4 strong covalent bonds for each C atom
very strong
very high melting point
doesn’t conduct electricity

Question 11

properties of graphite

Answer 11

c

Question 12

why can graphite conduct electricity

Answer 12

one delocalised per carbon atom

Question 13

properties of fullerenes

Answer 13

hollow shaped molecules

Question 14

what carbon fullerene has a spherical shape

Answer 14

C60
(buckminsterfullerene)

Question 15

what is graphene

Answer 15

single layer of graphite

Question 16

what is metallic bonding

Answer 16

forces of attraction between delocalised electrons of metal ions

Question 17

properties of metals

Answer 17

high melting point
good conductors
malleable

Question 18

what are alloys

Answer 18

mixture of metal with other elements

Question 19

example of an alloy

Answer 19

steel

Question 20

why are alloys harder than pure metals

Answer 20

different atom sizes distort the layers and therefore cannot slide over each other

Question 21

what are limitations of the simple atom model

Answer 21

no forces between spheres
shown as solid

Question 22

intermolecular forces

Answer 22

forces of attraction that act with neighbouring particles

Question 23

why do giant covalent substances have high melting points

Answer 23

lots if energy needed to break strong covalent bonds between atoms

Question 24

why do small molecules have low melting points

Answer 24

small amount of energy needed to break weak intermolecular forces

Question 25

3 uses for fullerenes

Answer 25

lubricants
drug delivery
high tech electronics

Question 26

what is an ion

Answer 26

atom that has lost or gained electrons

Question 27

what type of elements form ionic bonds

Answer 27

non metal and metal

Question 28

what charge ions do group 7 make

Answer 28

1-

Question 29

when can ionic structures conduct electricity

Answer 29

when molten or dissolved

Question 30

molecular formula of propane

Answer 30

C3H6O