paper 2

Question 1

electric current

Answer 1

is the flow of the electrons or ions

Question 2

when do ionic compounds conduct electricity?

Answer 2

when molten or in solution

Question 3

why can’t solid ionic compounds conduct electricity?

Answer 3

because the ions aren’t able to move around

Question 4

why can dissolved ionic compounds conduct electricity?

Answer 4

when it is dissolved the ions separate and are able to move in the solution

Question 4

why can molten ionic compounds conduct electricity?

Answer 4

the ions are able to move when an ionic compound melts

Question 5

how are metals held together?

Answer 5

by metallic bonding

Question 6

how does metallic bonding occur?

Answer 6

• metals have a giant structure of positive ions surrounded by a sea of delocalised electrons
• electrostatic attractions between nuclei of positive ions and the electrons

Question 7

metallic bonding

Answer 7

the electrostatic attractions between the nuclei of the positive ions and the electrons

Question 8

why are metals good conductors of electricity and heat?

Answer 8

• delocalised electrons move
• metals conduct electricity
• energy can be transferred through material

Question 9

why are metals malleable?

Answer 9

the layers of ions in a metal can slide over each other

Question 10

what does malleable mean?

Answer 10

e.g. metals can be hammered