AQA GCSE Combined Science: Synergy key terms

The number of specified particles per mole: $N_A = 6.02 \times 10^{23}\ \text{mol}^{-1}$.

Forces acting on the same object that combine to give a resultant force of zero.

A chemical equation with the same number of atoms of each element on the reactant side and the product side.

A contraceptive method that physically prevents sperm from reaching an egg, such as a condom or diaphragm.

The rate at which chemical reactions occur in the body when it is at rest.

A substance that neutralises an acid, such as a metal oxide, metal hydroxide or metal carbonate.

The pencil line on chromatography paper where the samples are initially placed and from which their travel distances are measured.

A non-cancerous tumour that stays in one place, does not invade neighbouring tissues and stops growing before it becomes too large.

A high-speed electron emitted from a nucleus when a neutron turns into a proton. Its symbol in a nuclear equation is $^{0}_{-1}\mathrm{e}$.

A disc shape with a depression on both sides, giving a large surface area relative to its volume.

An ionic compound containing only two elements.

A system that gives each species a two-part scientific name consisting of its genus and a second word identifying the species within that genus.

A chemical reaction or series of reactions taking place within living organisms.

The variety of different species of organisms on Earth or within an ecosystem.

A fuel made from recently living biological material, such as plants, or their products.

Use of bacteria to produce a solution containing metal compounds from an ore.

A replacement heart valve made from biological tissue, such as tissue from a pig or cow.

The mass of living biological material.

A living part of an ecosystem, such as a plant, animal or microorganism.

An influence arising from living organisms, such as predation, disease or competition.

The removal of colour from a material by a chemical reaction; chlorine bleaches damp litmus paper white.

A tissue consisting of liquid plasma with red blood cells, white blood cells and platelets suspended in it.

The amount of glucose in a given volume of blood.

The temperature at which a liquid boils and changes into a gas.

The separation of bonded atoms, which requires energy to be supplied.

The energy needed to break one mole of a particular type of bond in gaseous molecules, usually given in kJ/mol.

The joining of atoms by a chemical bond, which releases energy.