OCR GCSE Chemistry B key terms

The gases released after a fuel is burnt in a furnace or power station.

A pulling interaction that draws particles towards one another and helps hold a substance together.

Attractive interactions that act between the particles of a substance.

A mixture designed as a useful product by combining components in carefully measured proportions.

The small whole-number ratio of ions represented by the formula of an ionic compound.

Coal, oil and natural gas formed from ancient organisms and used as energy resources; their combustion releases carbon dioxide.

A mixture of hydrocarbons collected together because its components have a similar range of boiling points.

A method of separating mixed liquids with different boiling points using a fractionating column and a condenser.

A column that improves the separation of liquids by allowing repeated evaporation and condensation.

Oxygen molecules, O₂, that are not chemically combined with other elements in a compound.

A change from liquid to solid in which energy is transferred from the substance to the surroundings.

A device that uses a continuing supply of fuel and oxygen to produce electricity by chemical reactions.

The complete sequence involved in supplying and using a fuel, including its production, storage, transport and final reaction.

A hollow molecule made entirely of carbon atoms, shaped as a cage or tube.

A drawing that shows every atom in a molecule and every bond between them.

A group of atoms in a molecule that takes part in a characteristic reaction, such as a carboxylic acid, alcohol or amine group.

An additional enquiry designed to test a new question, extend the evidence or examine whether a result applies under other conditions.

Coating iron or steel with zinc. The zinc provides a physical barrier and can also give sacrificial protection.

A space deliberately left in Mendeleev’s Periodic Table for an element that had not yet been discovered.

A state in which particles are far apart and move rapidly and randomly through the available space.

Equipment that removes a pollutant from a gas stream by bringing the gas into contact with a reacting material.

A graduated device whose plunger moves as gas enters, allowing the gas volume to be read from its scale.

A procedure in which a gas produces a characteristic positive result, allowing the gas to be identified.

A formula that describes the composition shared by members of a homologous series, using n for a variable number of carbon atoms.

A continuous network of atoms joined by covalent bonds.

A regular, repeating three-dimensional arrangement of positive and negative ions.

A structure containing a very large number of particles held together in a continuous arrangement.