AQA GCSE Combined Science Trilogy key terms

A medicine that relieves pain, a symptom of disease, without killing the pathogens causing an infection.

Leaf tissue near the upper surface whose cells contain many chloroplasts for photosynthesis.

An organ that monitors blood glucose concentration and releases hormones to control it.

An arrangement in which components are connected on separate branches between the same two junctions.

A connection in which branches are connected between the same two points in a circuit.

A membrane that allows some substances to pass through but prevents others from passing through.

Energy that particles have because of their motion, including vibration.

A representation of matter in which particles are drawn as small solid spheres, showing their arrangement and movement.

Energy associated with the positions of particles relative to one another and the forces between them.

Tiny particles suspended in air, including solid carbon particles from fuel combustion.

Tiny solid particles or liquid droplets suspended in the air, which may include soot and unburned hydrocarbons.

A process that does not require energy to be supplied by the cell.

A disease-causing agent, such as a bacterium, virus, fungus or protist.

Partly decomposed plant material that builds up over very long periods under waterlogged conditions.

A waterlogged, acidic habitat in which partly decomposed plant material accumulates as peat.

The checking of scientific research by other scientists with relevant expertise, including its methods, results and conclusions.

The percentage of an element’s atoms that are a particular isotope.

The percentage of a compound’s total mass contributed by a particular element.

The change in mass expressed as a percentage of the initial mass: $\frac{\text{final mass}-\text{initial mass}}{\text{initial mass}}\times100$.

Contraceptive effectiveness when a method is used correctly and consistently.

A horizontal row of the periodic table. Its number gives the number of occupied electron shells in an atom.

A table displaying the chemical elements in an organised arrangement.

A magnet that produces its own magnetic field and retains its magnetism without needing to be placed in another magnetic field.

A fluid-filled compartment in a plant cell that contains cell sap and helps support the cell.

The industry that processes substances obtained from crude oil to manufacture useful chemicals and materials.

A measure of how acidic or alkaline a solution is. A neutral solution has pH 7.

A white blood cell that engulfs and digests pathogens.