Applied Sciences
What the Applied Sciences domain tests
The Applied Sciences domain tests core physics, chemistry, and biology with an emphasis on measurement, data interpretation, and quantitative relationships. It rewards candidates who can connect a formula to a physical or chemical situation.
Core rules and concepts
- Convert to consistent units before substituting into formulas; track significant figures at the end, not at every step.
- In chemistry, balance equations before using mole ratios. Molarity is moles of solute per litre of solution, not per litre of solvent.
- In thermodynamics, distinguish heat from temperature and state functions from path functions.
- In biology, relate structure to function and identify the independent, dependent, and controlled variables in an experiment.
- In data questions, read the trend and the uncertainty; a single point does not establish a relationship.
Worked example
Dilute 50 mL of 0.20 M solution to a final volume of 250 mL. Find the new concentration. Reasoning: moles of solute are conserved, so C1V1 = C2V2. Use 0.20 × 50 = C2 × 250, giving C2 = 10/250 = 0.040 M. The volume increased fivefold, so the concentration fell fivefold. Adding solvent does not change the moles.
Traps that cost marks
Using the final volume instead of the volume added, confusing molarity with molality, ignoring limiting reagents, and treating correlation as causation. In graphs, do not extrapolate beyond the data without justification.