Science, Technology, and Society
What to know
This domain connects chemistry to real-world contexts: environmental chemistry, energy resources, materials, medicine, and the ethical and societal implications of chemical technology. You should be able to evaluate benefits and risks, interpret data and graphs related to societal issues, and discuss sustainability concepts such as green chemistry, recycling, and pollution control.
Know key examples: greenhouse gases and combustion, acid rain from sulfur and nitrogen oxides, ozone depletion by CFCs, water treatment and purification, and the role of catalysts in industrial processes. Understand green chemistry principles such as atom economy, reducing hazardous substances, and designing for degradation. Be prepared to reason about trade-offs, not just recall facts.
Traps
- Treating a technology as purely beneficial or purely harmful instead of weighing trade-offs.
- Confusing the greenhouse effect with ozone depletion; they involve different gases and mechanisms.
- Misreading graphs or correlation as causation in data-based items.
- Ignoring units or scale when comparing environmental data.
- Overlooking that green chemistry seeks to reduce hazard at the source, not just treat waste.
Worked example
Atom economy = (mass of desired product / total mass of reactants) × 100%. A reaction producing 44 g of desired product from 100 g of reactants has 44% atom economy. Higher atom economy means less waste, a core green chemistry goal.
Rule of thumb: when a question asks about societal impact, identify the benefit, the risk, and the evidence before choosing.