OCR A Chemistry definitions

What is the definition of an electrophile?

• An electron pair donor

• An electron pair acceptor

• A proton donor

• A proton acceptor

What does the enthalpy change of combustion (ΔcH) refer to?

• Complete combustion to form 1 mol of products

• Complete combustion of 1 mol of a substance

• Combustion of 1 mol of a substance

• Formation of 1 mol of water from combustion

What is the enthalpy change of formation (ΔfH)?

• Formation of 1 mol of a compound from its elements

• Formation of 1 mol of a compound from its gaseous ions

• Removal of 1 mol of electrons from gaseous atoms

• Formation of 1 mol of a an element

What does the enthalpy change of hydration (ΔhydH) involve?

• Dissolving of 1 mol of solute

• Dissolving of 1 mol of gaseous ions in water

• Formation of 1 mol of water its gaseous ios

• Removal of 1 mol of electrons from gaseous atoms

What is the enthalpy change of neutralisation (ΔneutH)?

• Formation of 1 mol of water from neutralisation

• Dissolving of 1 mol of solute

• Formation of 1 mol of a salt and water from an acid and alkali

• Complete combustion of 1 mol of a substance

What does the enthalpy change of solution (ΔsolH) refer to?

• Dissolving of 1 mol of solute

• Formation of 1 mol of a water in a solution

• Dissolving of 1 mol of gaseous ions in water

• Dissolving of 1 mol of solvent

What is the first ionisation energy?

• Removal of 1 mol of electrons from 1 mol of gaseous atoms

• Formation of 1 mol of ions from gaseous atoms

• Removal of electrons to form 1 mol of gaseous atoms

• Removal of 1 mol of electrons from 1 mol of atoms

What is a homologous series?

• A series of organic compounds with the same functional group but with each successive member differing by CH2

• A series of organic compounds with different functional groups but with each successive member differing by CH3

• A series of organic compounds with similar functional groups and similar physical properties

• A series of organic compounds with the same functional group and similar chemical properties

What is the definition of a mole (mol)?

• The SI unit of amount of substance containing 6.022 x 10²³ elementary entities

• The SI unit of mass containing 6.022 x 10²³ elementary entities

• The SI unit of volume containing 6.022 x 10²³ elementary entities

• One mole of a substance contains as many substance units as

  there are atoms in 12g of carbon-12.

What is a nucleophile?

• An electron pair donor

• An electron pair acceptor

• An electron donor

• An electron acceptor