IGCSE Edexcel Chemistry revision
Atom - ANS The smallest particle of an element that can take part in a chemical reaction.
Molecule - ANS A small particle made from more than one atom bonded together.
Element - ANS A substance made up from atoms that contain the same number of protons.
Compound - ANS A substance made from two or more elements chemically bonded together.
Mixture - ANS A combination of two or more substances, either elements and/or compounds, that are
not chemically bonded together.
Sublimation - ANS The change straight from a solid to gas.
Filtration - ANS Method used to separate solids from liquids.
Crystallisation - ANS Method used to separate mixtures of solid dissolved in liquid, reliant on the fact
that solids are more soluble at higher temperatures.
Distillation - ANS Method used to separate a mixture of liquid using the differences in their boiling
points.
Paper Chromatography - ANS Method used to separate mixtures of dyes or pigments and is used to test
the purity of a mixture.
Fractional distillation - ANS Method used when mixture being distilled cannot separate them
completely, with this method much purer fractions are produced.
, Noble Gas - ANS Have full outer shells and are unreactive.
Isotopes - ANS Atoms with the same number of protons but a different number of neutrons.
Ionic bonding - ANS The gain or loss of electrons between an metal and a non metal.
Covalent Bonding - ANS The sharing of electrons between a non metal and a non metal
Anode - ANS Positive electrode, where oxidation occurs.
Cathode - ANS Negative electrode , where reduction occurs.
Catalyst - ANS A substance that speeds up a chemical reaction but which is chemically unchanged at the
end of the reaction.
Anion - ANS A negatively charged ion that move towards the Anode during electrolysis.
Cation - ANS A positively charged ion that move toward the Cathode during electrolysis.
Electrolysis - ANS The process in which electricity is used to break compounds down into their elements.
Electrolyte - ANS The mixture that is being electrolysed that must be liquid to allow ions to move.
Brine - ANS A concentrated solution of sodium chloride in water.
Atom - ANS The smallest particle of an element that can take part in a chemical reaction.
Molecule - ANS A small particle made from more than one atom bonded together.
Element - ANS A substance made up from atoms that contain the same number of protons.
Compound - ANS A substance made from two or more elements chemically bonded together.
Mixture - ANS A combination of two or more substances, either elements and/or compounds, that are
not chemically bonded together.
Sublimation - ANS The change straight from a solid to gas.
Filtration - ANS Method used to separate solids from liquids.
Crystallisation - ANS Method used to separate mixtures of solid dissolved in liquid, reliant on the fact
that solids are more soluble at higher temperatures.
Distillation - ANS Method used to separate a mixture of liquid using the differences in their boiling
points.
Paper Chromatography - ANS Method used to separate mixtures of dyes or pigments and is used to test
the purity of a mixture.
Fractional distillation - ANS Method used when mixture being distilled cannot separate them
completely, with this method much purer fractions are produced.
, Noble Gas - ANS Have full outer shells and are unreactive.
Isotopes - ANS Atoms with the same number of protons but a different number of neutrons.
Ionic bonding - ANS The gain or loss of electrons between an metal and a non metal.
Covalent Bonding - ANS The sharing of electrons between a non metal and a non metal
Anode - ANS Positive electrode, where oxidation occurs.
Cathode - ANS Negative electrode , where reduction occurs.
Catalyst - ANS A substance that speeds up a chemical reaction but which is chemically unchanged at the
end of the reaction.
Anion - ANS A negatively charged ion that move towards the Anode during electrolysis.
Cation - ANS A positively charged ion that move toward the Cathode during electrolysis.
Electrolysis - ANS The process in which electricity is used to break compounds down into their elements.
Electrolyte - ANS The mixture that is being electrolysed that must be liquid to allow ions to move.
Brine - ANS A concentrated solution of sodium chloride in water.
