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GCSE Chemistry · key term
A statement of the expected outcome in a particular context, made from a hypothesis or scientific theory.
Used by Edexcel and OCR
Specification 6.4 · Paper 2
A conclusion about an unknown case based on an established pattern and relevant evidence.
Revise: Reactivity Pattern of Alkali MetalsThis is a qualitative prediction: the trend supports the relative order, but it does not provide an exact reaction time or justify inventing precise observations.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A testable statement about an unknown result, made from an observed pattern or scientific explanation.
Revise: Support for Mendeleev's ideasA useful scientific prediction must be open to testing. If a new element had been discovered in one of Mendeleev’s gaps but had very different properties from those predicted, that would have counted against his arrangement. Instead, several discoveries matched his predictions closely.
A chemical forecast judged likely from an element’s position and established patterns in the Periodic Table.
A statement of the result or pattern expected in a particular context if an explanation is correct.
A statement of the outcome expected in a particular situation if a hypothesis or scientific idea is correct.
For a question about Mendeleev’s gaps, link prediction to evidence: he predicted the properties of an undiscovered element, and a later discovery had similar properties.
For a displacement prediction, compare the two elements of the same type. A reaction occurs only if the free element is more reactive than the element in the compound.
Write a prediction in a testable form: identify the factor changed, the outcome measured and the expected direction or pattern.
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