AS June 2021

Question 1

Two features of the current model that are not in the Rutherford model

Answer 1

-current model has neutrons and protons
-current model has electrons in different orbitals

Question 2

Explain in terms of structure and bonding why magnesium chloride has a high melting point

Answer 2

-ionic lattice
-strong force of attraction between oppositely charged ions

Question 3

-Describe a further test to show if a solution contains chloride or bromide ions

Answer 3

-add dilute ammonia solution
-if the precipitate dissolves, chloride ions are present
-if precipitate does not dissolve bromide ions are present

Question 4

Equation for chlorine with water

Answer 4

-Cl2 + H20 > HCl + HClO

Question 5

Equation for chlorine and cold, aqueous sodium hydroxide in the manufacture of bleach

Answer 5

Cl2 + 2NaOH > NaCl +NaOCl + H20

Question 6

Standard enthalpy of combustion

Answer 6

-the enthalpy change when 1 mole of a substance burns completely in oxygen with all substances in their standard states