AQA GCSE Combined Science Trilogy key terms

An upper chamber of the heart that receives blood.

The total change in velocity divided by the time taken: $a = \frac{\Delta v}{t}$.

The total kinetic energy of a group of molecules divided by the number of molecules.

The total distance travelled divided by the total time taken for a journey.

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

The long extension of a neurone that carries electrical impulses away from its cell body.

A symbol equation with the same number of atoms of each element on both sides of the reaction arrow.

Forces acting on an object that combine to give zero resultant force.

A representation of a chemical reaction using chemical symbols and formulae, with equal numbers of atoms of each element on both sides.

A number written before a chemical formula in a balanced equation that multiplies the whole formula.

A contraceptive method that creates a physical barrier; condoms also reduce the transfer of pathogens during sexual contact.

A contraceptive method that physically prevents sperm 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. Examples include metal oxides, metal hydroxides and metal carbonates.

Two or more cells connected together to provide a source of potential difference.

The unit of activity. An activity of 1 Bq means one nuclear decay per second.

A way an organism behaves that helps it survive in its environment.

A growth of abnormal cells contained in one area, usually within a membrane, which does not invade other tissues.

A high-speed electron emitted from the nucleus during beta decay, represented by $^{0}_{-1}\mathrm{e}$.

An influence that favours a particular conclusion, for example by selecting supporting evidence while ignoring evidence that challenges it.

A disc shape with a depression on both sides, giving a thin centre and a large surface-area-to-volume ratio.

An alkaline fluid made in the liver and stored in the gall bladder that neutralises stomach acid and emulsifies fats.

The process by which a bacterial cell divides to produce two cells.

An ionic compound containing just two different elements.

A system giving each species a two-part scientific name consisting of its genus name followed by a species-identifying word.

Capable of being broken down by microorganisms.

The variety of different living organisms in an area.