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GCSE Chemistry · key term
The substances formed by a chemical reaction.
Used by Edexcel and OCR
Specification 0.3, 7.16 · Paper 1, Paper 2
The substances formed in a chemical reaction, written on the right of an equation.
Revise: Balanced Chemical EquationsThe reactants are written on the left and the products on the right, with an arrow meaning “react to form”.
Decide whether a profile is exothermic or endothermic by comparing the energy levels of the products and reactants—not by looking at the height of the peak.
Do not treat progress of reaction as time: it represents the route from reactants to products.
A colour change or deposit is evidence to interpret, not an explanation by itself: link it to the possible products.
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Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The new substances formed in a chemical reaction.
Revise: Apparatus and techniquesA change in colour, a new solid deposit, bubbles or a temperature change may provide evidence that products have formed. In the copper(II) sulfate example, a copper deposit supports the conclusion that a more reactive metal has displaced copper from the solution. An unchanged mixture does not by itself identify every substance present; it tells you that no visible reaction occurred under those conditions.