← Combined Science syllabus

SingaporeCombined Science

Chemistry: Metals and Organic Chemistry

3 dot points across 3 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

Where do fuels come from, and what happens chemically when we burn them?

Describe crude oil as a source of fuels, recognise alkanes as a family of hydrocarbons, and write the products of complete and incomplete combustion
A focused N(A)-Level answer on organic chemistry. Crude oil and fractional distillation, alkanes as a hydrocarbon family, and the products of complete and incomplete combustion.
7 min answer →

What is air made of, and how do human activities pollute it and change the climate?

State the composition of clean air, name common air pollutants and their sources and effects, and describe the greenhouse effect
A focused N(A)-Level answer on air. The composition of clean air, common pollutants and where they come from, their effects, and how the greenhouse effect warms the planet.
7 min answer →

How do we rank metals by reactivity, and how does that decide the way we extract them from their ores?

Place metals in order of reactivity from their reactions, use displacement reactions, and relate reactivity to the method used to extract a metal
A focused N(A)-Level answer on metals. The reactivity series, displacement reactions, and how a metal's reactivity decides whether it is extracted by carbon or by electrolysis.
8 min answer →