Reflecting on the impacts of science
🎯The four strands
At Year 5 the strands ask you to:
- i. Explain the ways in which science is applied and used to address a specific problem or issue.
- ii. Discuss and evaluate the various implications of using science and its application to solve that problem — moral, ethical, social, economic, political, cultural and environmental.
- iii. Apply scientific language effectively.
- iv. Document the work of others and sources of information used.
📈What moves you up the bands
A 1–2 response gives an opinion — “nuclear power is bad” — with no science behind it and only one side considered. A 7–8 response explains the actual science of the application, then discusses implications from more than one angle, giving weight to benefits and costs, and reaches a considered position rather than a slogan. The two words that define the top band are specific and balanced: specific because the reasoning is tied to how the science really works, balanced because a real issue has more than one side.
✏️A worked reflection
The science, applied (strand i): A nuclear reactor releases energy by fission: a neutron splits a heavy nucleus such as uranium-235, and the mass difference appears as energy (\( E = mc^{2} \)). That heat boils water to drive turbines, exactly as in a coal station — but with no carbon dioxide from the reaction itself. A given mass of nuclear fuel releases on the order of a million times more energy than the same mass of fossil fuel, which is why the fuel quantities are tiny by comparison.
Implications, discussed and evaluated (strand ii): On the benefit side, the low carbon output addresses climate change directly, and the high energy density means a steady, large supply from little fuel — an economic and environmental gain. On the cost side, the waste stays radioactive for thousands of years and must be stored safely (an ethical burden passed to future generations); a serious accident, though rare, has severe and long-lasting consequences (a social and environmental risk); and the plants are expensive and slow to build (an economic drawback). A balanced position weighs these against each other and against the alternatives: nuclear’s carbon advantage is real, but it is not free of cost, and whether it is the right choice depends on how a country values a rare-but-severe risk against a certain-and-gradual one from fossil fuels.
Scientific language (strand iii) is what keeps this out of the realm of opinion: fission, nucleus, energy density, radioactive, half-life — used correctly, they show the reflection rests on understanding rather than on headlines.
Documenting sources (strand iv): Any figures — energy densities, waste half-lives, accident statistics — must be attributed to where they came from, in a consistent referencing style. Uncited numbers cannot be trusted and cost marks on the fourth strand regardless of how good the argument is.