simple and giant structures

Question 1

what is a giant ionic structure?

Answer 1

a giant lattice structure

Question 2

what do ionic compounds have high melting and boiling points?

Answer 2

because of the electrostatic forces between oppositley charged ions

Question 2

What do ionic compounds have?

Answer 2

high melting and boiling points

Question 3

what do ionic compounds often form

Answer 3

crystals

Question 4

for an ionic substance to conudct electricty what must it’s ions be?

Answer 4

free to move so they can carry charge from place to place

Question 5

when are ions free to move in an ionic compound?

Answer 5

. if the compount is molten liquid
. if the compound is in a solution
. NOT when its solid

Question 6

why is the melting point of sodium chloride lower than of magnesium oxide?

Answer 6

because it has weaker ionic bonds which need less heat to overcome
. beacuse the sodium and chlorie ions have fewer charges
. and sodium ions are bigger than magnesium ions so they cannot get as close to the negatively charged ions

Question 7

whatdo simple molecular structures consist of?

Answer 7

a small number of atoms joined by a covalent bond e.g water and C02

Question 8

what forces are holding simple molecular structures together?

Answer 8

WEAK intermolecular forces

Question 9

what is the melting and boling point of a simple molecular structure?

Answer 9

low because the intermolecular forces are weak

Question 10

can simple molecular structure conduct electrity?

Answer 10

no, because there are no free electrons to carry an electrical current

Question 11

what do giant covalent structures consist of?

Answer 11

non-metal atome joined to adjacent atoms by covalent bonds, the atoms are then arranged into lattices

Question 12

do giant covalent structures have high melting points?

Answer 12

yes, because ther are a lot of strong covalent bonds to break

Question 13

what are some examples of giant covalent structures?

Answer 13

. Diamond
. graphite
. sillica

Question 14

give features of the giant covalent structure of a diamond?

Answer 14

. form or carbon atoms
. very hard
. high melting point
. does not conduct electricity
. transparent/crystalline
. used as gemstones, glass cutting, drill bits

Question 15

give features of the giant covalent structure of graphite?

Answer 15

. layers of carbon atoms
. each carbon atom in a layer is joined to only 3 other carbon atoms
. the fourth carbon electron becomes delocalised between the electrons
. graphite can conduct electrity
. layers can slide over eachother because no covalent bonds
. used in pencils and is a lubricant

Question 16

give features of the giant covalent structure of sillica?

Answer 16

. found in sand
. has a similar structure to diamond
. hard
. high melting point
. contains silicon and oxygen atoms instead of carbon atoms