What happens to iron in this reaction? iron + copper(II) oxide → iron oxide + copper
It acts as an oxidising agent
It becomes reduced
It becomes oxidised
Which statement about the reaction between magnesium and chlorine is correct?
Magnesium is oxidised because magnesium atoms gain electrons to form magnesium ions, Mg2+.
Magnesium is oxidised because magnesium atoms lose electrons to form magnesium ions, Mg2+.
Magnesium is reduced because magnesium atoms gain electrons to form magnesium ions, Mg2-.
What does the pH scale measure?
The relative acidity or alkalinity of a solution
The relative neutrality of a solution
The relative ability of metals to react with acid
What name is given to a base that dissolves in water?
Amphoteric
An alkali
A salt
Universal indicator is added to a colourless solution and turns dark blue. What does this tell you?
The solution is acidic
The solution is neutral
The solution is alkaline
Which equation models the general reaction that happens in the neutralisation between an acid and an alkali?
H+(aq) + OH-(aq) → H2O(l)
HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
NH3(aq) + H2O(l) → NH4+(aq) + OH-(aq)
Which gas is produced when a metal reacts with a dilute acid?
Oxygen
Hydrogen
Carbon dioxide
Which pair of reactants would produce ammonium chloride?
Ammonium and hydrochloric acid
Ammonia and sulfuric acid
Ammonia and hydrochloric acid
What name is given to a reaction in which oxidation and reduction happen at the same time? - Higher
Oxired reaction
Redox reaction
Neutralisation reaction
A solution of 1 mol/dm3 hydrochloric acid has a pH of 0. What is the pH of 0.001 mol/dm3 hydrochloric acid? - Higher
3
-3
2