OCR GCSE Chemistry B key terms

The balance between products and reactants in a reversible reaction at equilibrium.

A chemical element that an organism needs for growth and healthy functioning.

A judgement of an approximate value based on suitable reference values and comparisons.

A conflict or choice involving judgements about what ought to be done or how people, animals or the environment ought to be treated.

A question about what is right, wrong, fair or acceptable, involving values that cannot be determined by scientific evidence alone.

Nutrient enrichment of water that can lead to excessive algal growth and a fall in dissolved oxygen.

Judging the quality and significance of evidence and arguments before reaching a conclusion.

Removing a liquid solvent from a solution by allowing it to become a gas.

Information used to support or challenge a scientific claim, including observations and measurements.

A reactant present in more than the amount required by the balanced equation, so some remains when the reaction stops.

A reaction direction that releases energy to the surroundings, usually as heat.

A reaction that transfers energy from the reacting chemicals to the surroundings, usually causing the surroundings to warm up.

The complete planned approach to an investigation, including the apparatus, method, measurements, controls, repeats, range and treatment of data.

The power $n$ in $a \times 10^n$; it shows how many places the decimal point is shifted.

The total area of a solid that is exposed to a substance it can react with.

Contact between a substance and a person, another organism or the environment.

To read and report information presented in a chart, graph or table without adding an explanation.

The removal of a metal from a compound containing it.

Estimating a value beyond the range covered by the measured data.

A weather event, such as a heatwave, drought or period of very heavy rainfall, that is unusually severe or uncommon for a particular place and time.

A variable that might influence the outcome being investigated.

Multiplication by 10; for example, a ten-fold increase changes 2 into 20.

A substance supplied to a chemical process to make a product.

A substance added to soil to supply nutrients needed for plant growth.

The liquid that passes through filter paper during filtration.

A method of separating an insoluble solid from a liquid by passing the mixture through a filter.

A resource with a limited supply that is depleted through use, such as crude oil or a metal ore.