OCR GCSE Chemistry B key terms

An interpretation drawn from observations or data using scientific knowledge and reasoning.

Long-wavelength electromagnetic radiation emitted by warm objects, including the Earth’s surface.

A salt that does not dissolve appreciably in water.

The rate at one particular moment during a reaction.

The use of a machine to detect, identify or measure substances in a sample.

A sequence of production stages whose outputs supply materials for other stages.

An attraction between separate molecules; it is weaker than a covalent bond.

Forces of attraction between separate molecules.

The internationally agreed system of measurement units used to communicate quantitative scientific data consistently.

Estimating a value that lies within the range covered by the measured data.

To explain what data show by identifying patterns, relationships, differences or unusual results.

The difference between neighbouring values of the independent variable.

An electrically charged particle formed when an atom, or a bonded group of atoms, loses or gains electrons.

The strong electrostatic attraction between oppositely charged ions.

A substance containing positive and negative ions held together by electrostatic attraction.

An equation showing only the ions that take part in a reaction.

A regular, repeating three-dimensional arrangement of positive and negative ions.

The formation of ions from a substance when it dissolves in water.

The smallest whole-number ratio of each type of ion in an ionic compound.

An atom of an element with a particular number of neutrons. Isotopes of the same element have the same number of protons but different numbers of neutrons.

Atoms of the same element that have the same number of protons but different numbers of neutrons.

A systematic set of internationally agreed rules for naming chemical substances.

A waste-disposal method in which refuse is buried at a designated site.

A repeating three-dimensional arrangement of particles in a solid.

The rule that the total mass of reactants equals the total mass of products in a chemical reaction.

A metal-containing solution produced when soluble compounds are leached from a solid material.

A study of the environmental impacts associated with every stage of a product's life, from obtaining raw materials to its end-of-life treatment.