AS Past Paper 2017 (depth)

Question 1

State what is meant by the term ionic bond

Answer 1

Electrostatic attraction between positive and negative ions

Question 2

How do you calculate the number of ions in a given mass of a compound?

Answer 2

Work out the moles of the element
Multiply that number by Avagadro’s constant.

Question 3

Compare the electrical conductivities of solid and aqueous Barium chloride.

Answer 3

Solid barium chloride does not conduct electricity
Because it has ions fixed in a lattice
Aqueous barium chloride does conduct
Because it has mobile ions

Question 4

Describe the use of barium chloride in qualitative analysis

Answer 4

It tests for sulfate ions
A white precipitate will form

Question 5

What points must you include in an experiment question about rate of reactions?

Answer 5

Outline of the method used
What calculations should be carried out
How to process results (e.g. graph)