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15 exam-style questions with model answers, plus 20 quick multi-choice questions — every question on the site for this standard, grouped by the 5 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 what the NZQA clarification means by "research results alone are insufficient", and describe what a report must contain in addition to accurate research.
A student writes: "Nylon is a polymer made by condensation polymerisation. It is strong and does not absorb much water. It is used in ropes, clothing and fishing nets." Explain why this paragraph would not reach Merit, and rewrite it so that it would.
Explain the difference between explaining a link and evaluating an influence in this standard, and justify why the second is harder, using an example.
List four features that make a technology a good choice for this standard, and explain why each matters.
Explain how the historical development of a technology helps a student meet the Merit criterion, and illustrate with an example.
Evaluate the claim that "the more advanced the technology, the better the topic choice for this standard". Justify your position.
Describe the two main types of UV filter used in sunscreen and explain how each protects the skin.
Explain why a broad spectrum sunscreen must contain several different active ingredients, linking this to the structure of the filter molecules.
Evaluate how the chemistry of UV filters has influenced the development of sunscreen, considering both what it enabled and what it constrained.
Describe the three properties of lithium that make it suitable for use in batteries, and give the half equations occurring at each electrode during discharge.
Explain why lithium-ion batteries use a graphite electrode rather than lithium metal, and link this to the rechargeability of the battery.
Evaluate how chemistry has influenced the development of the lithium-ion battery, and discuss the constraints the chemistry continues to impose on its use in New Zealand.
Name the three pollutants removed by a three-way catalytic converter, state where each comes from, and write a balanced equation for the reaction that removes each.
Explain why the catalyst metals are coated onto a ceramic honeycomb, and link this to both the rate of reaction and the cost of the technology.
Evaluate how the chemistry of catalysis influenced the development of vehicle emissions technology and of fuel policy in New Zealand.