OCR GCSE Chemistry B key terms

A repeating pattern, such as the recurrence of similar chemical properties among elements in the Periodic Table.

A factor concerning an individual, such as their needs, health, circumstances, priorities or willingness to accept inconvenience or risk.

A plastic called polyethylene terephthalate, commonly used to make drinks bottles.

The industry that uses chemicals derived from crude oil to make other chemical products.

A numerical measure related to the concentration of hydrogen ions in a solution.

An electronic instrument that measures the pH of a solution and displays a numerical value.

The biological process in which green plants, algae and some bacteria use light energy to make glucose from carbon dioxide and water, releasing oxygen.

A numerical scale used to compare the relative acidity and alkalinity of aqueous solutions.

A coating that prevents oxygen and water from reaching a metal surface.

A change in state or form in which the chemical identity of each substance remains the same and no new substance forms.

A characteristic that can be observed or measured without changing a substance into a different substance.

Whether a substance is a solid, liquid or gas under particular conditions.

The use of plants to absorb metal ions from soil so that metal compounds can be recovered from the harvested plants.

A small preliminary investigation used to check the method and identify safe, practical and measurable values for the main investigation.

A level section of a graph where the measured quantity is no longer changing.

A scientifically reasonable process explaining how a proposed cause could produce an outcome.

Thomson’s model of an atom as a ball of positive charge with negative electrons embedded in it.

A person involved in developing public policy, such as a politician or government official.

A harmful substance released into the environment, often as a result of human activity.

A very large, long-chain molecule formed by joining many repeating units together.

An atom or group of atoms with a positive charge because it has lost one or more electrons.

A positively charged particle formed when an atom loses one or more electrons.

Water that is safe to drink.

A difference in electrical potential between two points that can drive charge through a circuit.

A whole-number power of ten, such as $10^3$, $10^0$ or $10^{-6}$.

A solid formed when substances react in solution; it may make the mixture cloudy.

How close repeated measurements are to one another.