OCR GCSE Chemistry B key terms

A method of recovering a dissolved solid from a solution by forming and collecting crystals.

A three-dimensional shape with six identical square faces and equal edge lengths.

Information gathered during an investigation, including measurements, counts and descriptive observations.

An organised arrangement of data in labelled rows and columns.

Changing information from one representation, such as a table, into another representation, such as a graph, while preserving its meaning and values.

The number of digits written after the decimal point.

A choice reached after considering available evidence, arguments, risks, benefits and relevant circumstances.

An electron that is not confined to one atom or bond and can move through a structure.

Electrons that are not tied to one particular atom or bond and can move through a structure.

Mass per unit volume, calculated using $\rho = m/V$.

The variable placed on the vertical axis; it is usually the variable that is measured in response.

The change of state from gas directly to solid, without passing through the liquid state.

A quantity found from other measured quantities using a defined relationship or equation.

Removing dissolved salts from seawater or other salty water to obtain fresh water.

A model expressed in words or statements that explains how a system behaves.

The product that the reaction is intended to make.

The removal of sulfur or sulfur compounds from a fuel or from gases produced when the fuel burns.

The distance from one side of an object to the other through its centre.

A molecule made from two atoms.

An acid solution containing a relatively small amount of acid per unit volume.

A relationship in which two quantities change by the same multiplication factor, so their ratio remains constant.

The conversion of an ion into an atom or molecule at an electrode.

A reaction in which a more reactive element takes the place of a less reactive element in a compound.

A reaction in which a more reactive element replaces a less reactive element in one of its compounds.

A diagram showing every atom and every bond in a molecule, with lines representing bonds.

The liquid collected after vapour has condensed during distillation.

A method of separating and collecting a liquid by evaporating it from a mixture and then condensing its vapour.