OCR GCSE Combined Science A · J250
Specification WS1.2b · Biology Paper 1, Biology Paper 2, Chemistry Paper 1, Chemistry Paper 2, Physics Paper 1, Physics Paper 2
Revise: Experimental Planning and Procedure DesignA practical procedure is a set of steps designed to produce useful evidence or a particular product. Its design depends on what you want to achieve. Testing a hypothesis requires a comparison; making a substance requires a sequence of reaction and separation steps; characterising a substance means investigating properties that help describe or identify it.