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Unit Keywords Definitions
1.1.2 Isotopes Isotopes are atoms of the same element but different numbers of neutrons.
1.1.2 Atomic (proton) Atomic (proton) number is the number of protons in the nucleus of an atom.
1.1.2 Mass (nucleon) Mass (nucleon) number is the number of particles (neutron and protons) in…

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1.1.6 Molar Volume Molar volume is the volume per mole of a gas.
1.1.7 Concentration Concentration of a solution is the amount of solute, in mol, dissolved per 1dm3.
1.1.7 Standard Solution Standard solution is a solution of known concentration. Standard solutions are normally used in titrations to
determine the…

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1.2.1 First ionisation The first ionisation energy of an element is the energy required to remove on electron from each atom in
energy one mole of gaseous atoms to form one mole of gaseous 1+ ion.
1.2.1 Electron Shielding Electron is the repulsion between electrons in different inner shells. Shielding…

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1.2.11 Polar covalent A polar covalent bond has a permanent dipole.

1.2.11 Polar molecule A polar molecule has an overall dipole, when you take into account any dipoles across the bonds
1.2.12 Intermolecular An intermolecular force is an attractive force between neighbouring molecules.
1.2.13 Permanent A permanent dipole-dipole…

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1.3.9 Precipitation A precipitation reaction is the formation of a solid from a solution during a chemical reaction. Precipitates
reaction are often formed when two aqueous solutions are mixed together.


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