Practise oxidation numbers, electron-transfer equations and identification of oxidising or reducing agents, using redox changes to construct and interpret balanced reactions.
Nitrogen and phosphorus are elements in Group 15 of the Periodic Table.
A common test for nitrates is the reaction with NaOH and Al . Equation 1 shows the reaction.
Deduce the oxidation state of nitrogen in NO3−.
(+)5 / V
Identify the species that is oxidised in equation 1.
aluminium / Al
Chlorine is a reactive element. It forms many compounds.
Bleach is used as a cleaning product to kill bacteria. It is made by adding compounds like sodium chlorate(I), NaClO, to water.
Sodium chlorate(I), NaClO, reacts with hydrogen peroxide to produce sodium chloride, water and oxygen gas.
Construct an equation for this reaction.
Correct equation:
NaClO+H2O2→O2+NaCl+H2O
The Group 17 elements are oxidising agents.
Explain how the Group 17 elements act as oxidising agents.
(halogens can) remove electron(s) (from a reactant)