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OCR Chemistry - Atoms, Bonds and Groups (Definitions)
Fichas del conjunto (31)
- 1AcidAn acid is a proton donor.
- 2BaseA base is a H+ acceptor.
- 3AlkaliAn alkali is a soluble base. An alkali is a type of base that dissolves in water forming OH- ions.
- 4SaltA salt is any compound formed from an acis when H+ ions from the acid have been replaced by metal ions or by another positive ion.
- 5Hydrated CrystalsRefers to the crystalline compound containing water molecules.
- 6Anhydrous CrystalsSubstance that contains no water molecules.
- 7Water of CrystallisationWater molecules within a crystalline structure.
- 8OxidationLoss of electrons
- 9ReductionGain of electrons
- 10Oxidation NumbersA measure of the number of electrons that an atom uses to bond with atoms of another element.
- 11Redox ReactionWhere both oxidation and reduction occur in the same reaction.
- 12Reducing AgentA reagent that reduces another species.
- 13Oxidising AgentA reagent that will oxidise another agent.
- 14Mass NumberThe number of particles (protons and neutrons) in the nucleus.
- 15Atomic NumberThe number of protons in the nucleus.
- 16IsotopeAtoms of the same element with different numbers of neutrons.
- 17Relative Atomic MassThe weighted mean mass of an atom of an element compared to 1/12 of an atom of carbon-12.
- 18Relative Isotopic MassThe mass of an atom of an isotope of an element compared to 1/12 of an atom of carbon-12.
- 19First Ionisation EnergyThe energy required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions.
- 20Second Ionisation EnergyThe energy required to remove one electron from one mole of gaseous 1+ ions to form one mole of gaseous 2+ ions.
- 21Ionic BondingElectrostatic attraction between two oppositely charged ions.
- 22Covalent BondA shared pair of electrons.
- 23Co-ordinate Bond (Dative covalent bone)Covalent bond where both shared electrons are donated by 1 atom.
- 24Metallic BondingElectrostatic attraction between a positive ion and a delocalised electron.
- 25ElectronegativityThe measure of the attraction a bonded atom has for the pair of electrons in a covalent bond.
- 26Hydrogen BondA strong dipole-dipole attraction between a lone pair of electrons on a highly electronegative atom and an electron defficent hydrogen on another molecule.
- 27Thermal DecompositionThe splitting up of a compound using heat.
- 28Displacement (Reaction)Where a more reactive halogen replaces a less reactive halide.
- 29Intermolecular ForcesAttractions between one molecule and a neighbouring molecule.
- 30DisproportionationWhen a single element is simultaneously oxidised and reduced.
- 31PeriodicityTrends and patterns of chemical and physical properties of elements.
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- A Levels (Atoms, Bonds and Groups) Chemistry Fichas sobre OCR Chemistry - Atoms, Bonds and Groups (Definitions), creado por GwynsM el 21/02/2013.
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