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12 exam-style questions with model answers, plus 16 quick multi-choice questions — every question on the site for this standard, grouped by the 4 pages of notes they come from.
Write a full answer before you reveal the model one — that comparison is where the marks come from. Every block links back to the notes that teach it.
State the two routes this standard allows for choosing a context, giving two named examples of each, and state what every account must be supported by.
Explain what it means for chemistry to be "integrated" into an explanation rather than appended to it, and illustrate the difference.
Analyse why a report that describes an environmental issue accurately and at length can still fail to reach Merit, and justify what structural change would be needed.
Give an account of how dissolved carbon dioxide lowers the pH of seawater, including the relevant equations.
Explain the link between dissolved carbon dioxide and the difficulty shellfish have in forming shells, integrating the relevant equations.
Evaluate the impact of ocean acidification on New Zealand, analysing the links between the chemistry and its consequences and considering what is uncertain.
Give an account of how nitrogen applied as urea fertiliser becomes nitrate in soil, including equations and the oxidation numbers of nitrogen.
Explain why nitrate leaches into groundwater while ammonium largely does not, and explain the consequences of that leaching for people and for waterways.
Evaluate the impact of nitrogen fertiliser use in New Zealand, comparing and contrasting the benefits of the chemistry with the issues it has created, and analysing the options for response.
Give an account of how chlorine atoms from CFCs destroy stratospheric ozone, including equations, and explain what makes the process catalytic.
Explain the link between the chemical properties that made CFCs commercially useful and the environmental damage they caused.
Evaluate the Montreal Protocol as a response to ozone depletion, comparing it with the response to other atmospheric issues, and analysing the problems its own solutions created.