What this standard actually asks for

How this standard is assessed

• AS91163 is internally assessed as a research report, usually written over two to three weeks with resources supplied by your teacher.
• It is the only Level 2 Chemistry standard with no fixed content. What is fixed is the relationship you have to demonstrate.

The one sentence that decides your grade

The NZQA clarification states that research results alone are insufficient.

• A report that explains the chemistry correctly and thoroughly and stops there is an Achieved report.
• The grades above it are earned by connecting that chemistry to the development of the technology.

The three verbs

Grade	Verb	What you must produce
Achieved	Account	An accurate description of the chemistry involved, with names, formulae and equations
Merit	Explain links	Statements of the form "because the chemistry is X, the technology could/had to be Y"
Excellence	Evaluate	A judgement — which chemical factors mattered most, what trade-offs were made, what the chemistry prevented as well as enabled

• The Merit test is simple: does every major section of your report contain the word "because", connecting a chemical property to a design decision? If not, that section is at Achieved.

What a "link" actually looks like

Take one chemical fact and follow it to a consequence for the technology.

• Not a link: "Titanium dioxide is used in sunscreen. It has a high refractive index."

• A link: "Titanium dioxide was chosen for sunscreens because it absorbs UV without being absorbed into skin, unlike organic filters — so it protects without any of the systemic exposure that made some organic filters controversial."

• An evaluation: "The choice of titanium dioxide over organic filters traded cosmetic acceptability for safety: the same particle size that scattered UV effectively also scattered visible light, leaving a white residue that consumers rejected. The technology only became commercially viable once nanoparticle TiO₂ could be manufactured, small enough to stop scattering visible light while still absorbing UV — so the chemistry of particle size, not the chemistry of UV absorption, was the limiting factor in the technology's adoption."

• Notice the evaluation does something the link does not: it identifies which chemical factor was the bottleneck, and says why the other one was not.

Using history

• The standard explicitly allows an account of the historical development, and the historical aspect can cover the whole of human history.
• History is the shortest path to links, because each stage of a technology's history is a problem that chemistry solved.
• Structure it as a chain:
  • What was the problem?
  • What chemical knowledge or discovery addressed it?
  • What did that make possible that was not possible before?
  • What new problem did the solution create?

Using chemistry vocabulary, symbols and conventions

• Explanatory Note 4 requires names, formulae and equations where appropriate. This is a chemistry standard, not a technology standard.
• Every case study should contain:
  • Formulae of the key substances.
  • Balanced equations for the key reactions, with state symbols.
  • Correct terminology — functional group, catalyst, activation energy, oxidation, polymer, ionic, covalent.
• A report on a chemical technology with no equations in it is missing a stated requirement.