a) Copper (II) Sulphide/CuS.√1

a) Yellow/orange solid turns grey.√1

a) Graphite and diamond.√

a) Q

a) Mg has a stronger√½ metallic bond√½ than Na. because it donates more electrons into the electron sea though both have giant metallic structure.√½

a) Sodium chloride/NaCl/KCl√1 (1) accept any chloride.

b) Bubbling HCl gas through a delivery tube to the water as water will suck backs/lack of a funnel to prevent suck back.√1(1) or Use of a conical flask that doesn’t require heat/ did not use round bottomed flask to spread heat.

a) Gay Lussac’s Law states that when gases reacts they do so in volumes that bear a simple whole number ratio to one another and to the products if gaseous.√1

. a) 8√1

b) Group VI √1 Period 2 √

a) Concentrated nitric acid.√1

b) Prepare the gas in open air/fume.√1 chamber because the gas has a pungent choking smell and is poisonous ( ½ mark).

. a) Coke as an alternative source of Carbon (IV) Oxide.√1

b) To cool the machines√1/slaking CaO to Ca(OH)₂

c) To react and produce ammoniacal brine. √1

. a) Is the energy required to remove one electron from the outermost energy level of an atom in gaseous state.√1

b) S,√1has the smallest atomic size, highest nuclear attraction to outermost electrons and does not easily loose an electron as it requires more energy.√1

a) Solution turns from colourless to brown.√1 because chlorine displaces bromide from solution forming bromine.√1 Reject displace bromine.

. a) Manganese (IV) Oxide.√½ speeds up the decomposition of Hydrogen peroxide to produce oxygen √½. Reject catalyst

b) First bubbles are mixed with air/impure.√1

c) It is slightly soluble in water.√1

2 electrons.√1

A suspension is a mixture formed when an insoluble solid is mixed with a liquid.√1 A precipitate is a solid substance formed when two fluids are mixed.√1

a) Inflammable/catches fire easily.√1

b) Toxic/poisonous/fatal.√1

a) Solid √½, melting point above room temperature(250C/298K)√½ (1)

b) Has an impurity.√1