OCR GCSE Chemistry B key terms

A fertiliser containing compounds that supply nitrogen, phosphorus and potassium.

One of four types of monomer that make up DNA.

A compact central region of an atom that contains most of its mass and has an overall positive charge.

Information recorded directly by noticing or measuring a phenomenon.

A value at which the measured outcome is greatest or most favourable under the stated criterion.

The power of ten that indicates the approximate scale of a number.

A rock containing enough of a metal or its compound to make extraction worthwhile.

A compound based on carbon, whether it occurs naturally or is made synthetically.

The result or event whose relationship with a factor is being investigated.

An atom or ion's highest occupied electron shell.

An electron in an atom's outermost occupied shell that can take part in bonding.

Electrons in the highest occupied electron shell of an atom; these are the electrons shown in a dot and cross diagram.

A result that lies noticeably away from the pattern formed by the other data.

The difference between the energy associated with the products and the energy associated with the reactants.

A reaction in which a species loses electrons.

A number describing the apparent charge of an atom in an element, compound or ion; uncombined elements have an oxidation state of zero.

A compound made from oxygen and one other element.

A group of compounds containing nitrogen and oxygen, often represented as NOₓ, which form when nitrogen and oxygen react at high temperatures.

A substance that causes another species to be oxidised by accepting electrons; the oxidising agent is itself reduced.

A gas made of three oxygen atoms per molecule, O₃, which forms an ultraviolet-absorbing layer in the upper atmosphere.

An atom, molecule or ion represented as one unit in a particle model; its meaning depends on the substance being modelled.

A model that explains substances in terms of particles such as atoms and molecules and how those particles behave.

Tiny solid or liquid particles suspended in the air, including soot produced by incomplete combustion.

A repeated or recognisable relationship in data.

A scientist with suitable knowledge of the same field as the researcher whose work is being evaluated.

The evaluation of a new scientific claim or research paper by other scientists with relevant expertise before it is accepted for publication.

A person's judgement about the size or importance of a risk, which may differ from the statistical estimate.