4 of the Chemistry glossary’s terms, each with the part of the syllabus where you first meet it.
Observations that describe a property without measuring it, such as a colour change, effervescence or the formation of a precipitate.
Data recorded as measured values with units, such as a volume of gas or a temperature.
An NMR signal split into four lines (1 : 3 : 3 : 1) by three hydrogen atoms on adjacent carbon atoms.
Stopping the reaction in a sample taken from a reaction mixture, by rapid cooling, large dilution or removing a catalyst or reactant, so that its composition at that moment can be measured.