Standard Grade Bitesize
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Properties of substances
Which of these sets of elements contain three electrical conductors?
copper, aluminium and sulphur
zinc, silver and sodium
bromine, mercury and iodine
All of the following substances are in solution. Select the list of solutions which are all conductors of electricity.
ethanol, ammonium bromide and copper(II) sulphate
glucose, hexane and nitric acid
sodium sulphate, potassium chloride and hydrochloric acid
Which of these sets is entirely made of substances which will never conduct under any circumstances?
sodium chloride, sulphuric acid and bromine
potassium hydroxide, ammonium nitrate and zinc
hexane, glucose and carbon dioxide
Select the set of substances where all will conduct electricity when in the molten (or liquid) state.
zinc chloride, aluminium oxide and iron sulphide
aluminium, paraffin wax and sodium oxide
ethanol, magnesium and sulphuric acid
Select the true statement about mercury.
It conducts electricity only when in the solid state
It never conducts electricity at all
It can conduct when in both solid and liquid states
Select the true statement about calcium chloride.
It conducts electricity when molten and in solution
Select the true statement about hexane (C6H14).
It conducts electricity when in solution
It never conducts electricity under any circumstances
It conducts electricity as a liquid and in aqueous solution
Which of these substances is not an electrolyte?
ammonium nitrate solution
molten lead bromide
When molten magnesium bromide is electrolysed, the correct ion-electron equation for the reaction at the positive electrode is:
Mg2+(l) → Mg(l) + 2e-
2Br-(aq) → Br2(g) + 2e-
Mg(l) → Mg2+(l) + 2e-
Choose the true statement from the following:
Liquid sodium conducts electricity because electrons travel through it
A solution of ammonium chloride conducts electricity because electrons travel through it
Solid paraffin wax does not conduct because its ions cannot move freely