MYP Chemistry: Environmental Chemistry & Pollution — FAQ

This MYP 4-5 unit typically covers acid rain and neutralisation, eutrophication from nitrate and phosphate run-off, the greenhouse effect and carbon cycle disruption, ozone depletion, and pollution from combustion and industrial waste. You link chemical equations to real environmental consequences rather than balancing them in isolation, which is where most schools mark it.

Acid rain forms when sulfur and nitrogen oxides react with water vapour to make sulfuric and nitric acids, lowering rainwater pH below its natural ~5.6. Eutrophication is nutrient overload — nitrates and phosphates cause algal blooms that deplete dissolved oxygen. The greenhouse effect is infrared radiation trapped by gases like CO2 and methane, raising global temperature.

Expect 'state' and 'describe' for basic recall — name a pollutant, describe its source. 'Explain' asks for the chemistry behind an effect, like why CO2 absorbs infrared radiation. 'Discuss' and 'evaluate' weigh up solutions to a pollution problem. According to the IB's MYP: Sciences guide, command terms map directly onto the criterion strands you're marked against.

Yes — this unit sits naturally under the MYP global context 'Globalisation and sustainability', exploring how local pollution choices have worldwide consequences. Many students use pollution-related data — air quality, plastic waste, local water testing — as the basis for their MYP Personal Project or Community Project, since it's genuinely researchable with real, gatherable data.

This unit is assessed like any other MYP Chemistry topic — through the four criteria, not a stand-alone pollution exam. Criterion A tests understanding of the chemistry itself, such as why acid rain forms; Criterion B and C assess an investigation like testing water samples; Criterion D asks you to evaluate real-world impacts and solutions.

Practical work on pollution mostly sits under Criterion B (Inquiring and Designing) and Criterion C (Processing and Evaluating). A typical task has you design a test — measuring pH change, turbidity, or dissolved oxygen — then process the results and evaluate reliability, which is exactly what examiners weight most heavily in the top mark bands.

Pick a genuinely testable variable — fertiliser concentration and algal growth, or vinegar concentration and limestone erosion — then follow the inquiry cycle precisely: research question, hypothesis with scientific reasoning, controlled method, processed data with uncertainty, and an evaluation naming one real limitation plus one specific improvement, not a vague one.

Not conceptually — the chemistry itself (simple equations, basic pH, energy transfer) is usually easier than topics like atomic structure or stoichiometry. Where students lose marks is depth: describing a pollutant instead of explaining the mechanism, or discussing solutions without weighing trade-offs, which is exactly what separates a level 5-6 answer from a 7-8.

The fastest gains come from practising Criterion D-style questions — evaluating a real pollution case study — because that's where most students plateau at level 5-6. Past papers aren't published for MYP, so criterion-aligned topical worksheets that mirror your child's actual school assessment structure give the repetition needed to close that gap.

This unit lays groundwork for DP topics like acid-base equilibria, redox chemistry and environmental impact discussions in the options. According to the IB, the current DP Chemistry guide (first examined 2025) still treats environmental chemistry largely qualitatively within Structure 3, but expects far more quantitative rigour — equilibrium constants, not just cause-and-effect description.

MYP Chemistry treats pollution as chemical reactions to explain and quantify; DP Environmental Systems and Societies — a separate DP subject, not an MYP one — treats it as a systems and sustainability problem with heavy data analysis and less equation-balancing. If your child prefers the maths/chemistry side over essay-style evaluation, DP Chemistry suits them better than ESS.

Since the IB doesn't publish official past papers for MYP, the most useful preparation is topical revision notes explaining the chemistry behind each pollutant, paired with practice questions written against the actual criterion strands your child's school marks against — not generic worksheets borrowed from a different subject's environmental science course.