IGCSE Edexcel Chemistry revision
Activation energy - ANS- The minimum energy required by colliding particles for
reaction to occur.
Alkane - ANS- A saturated hydrocarbon with the general formula= CnH2n+2
Alkene - ANS- An unsaturated hydrocarbon with the general formula = CnH2n
Alloys - ANS- Mixtures of metal that are made by mixing molten metals.
Ammonia - ANS- Gas that turns damp litmus paper blue.
Anion - ANS- A negatively charged ion that move towards the Anode during electrolysis.
Anode - ANS- Positive electrode, where oxidation occurs.
Atom - ANS- The smallest particle of an element that can take part in a chemical
reaction.
Base - ANS- A substance that neutralises an acid to form a salt.
Bauxite - ANS- The main ore of aluminium, from which aluminium oxide
is extracted.
Bitumen - ANS- Fraction used for road surfaces and covering flat roofs of buildings
Black - ANS- The color of iodine at rtp
Blue - ANS- The color of the precipitate produced when copper 2 reacts with aqueous
sodium hydroxide.
Brine - ANS- A concentrated solution of sodium chloride in water.
Brown - ANS- The color of the precipitate produced when Iron 3 reacts with aqueous
sodium hydroxide.
Calcium - ANS- When passed over a Bunsen burner turns flame Brick Red.
Carbon dioxide - ANS- Gas that turns lime water cloudy
, Catalyst - ANS- A substance that speeds up a chemical reaction but which is chemically
unchanged at the end of the reaction.
Cathode - ANS- Negative electrode , where reduction occurs.
Cation - ANS- A positively charged ion that move toward the Cathode during
electrolysis.
Chlorine - ANS- Gas that bleaches the color from damp litmus paper.
Compound - ANS- A substance made from two or more elements chemically bonded
together.
Covalent Bonding - ANS- The sharing of electrons between a non metal and a non metal
Cracking - ANS- The process of breaking long chain alkane molecules into short chain
alkanes and alkenes.
Cream - ANS- The color of precipitate when an Bromide reacts with dilute nitric acid and
silver nitrate solution.
Crystallisation - ANS- Method used to separate mixtures of solid dissolved in liquid,
reliant on the fact that solids are more soluble at higher temperatures.
Diesel oil - ANS- Fraction used for fuel for buses,lorries,trains and cars
Displacement reaction - ANS- A reaction in which one substance replaces another.
Distillation - ANS- Method used to separate a mixture of liquid using the differences in
their boiling points.
Dynamic equilibrium - ANS- When the rate of the forward reaction and backward
reactions in a reversible reaction mixture are equal.
Electrode - ANS- A solid electrical conductor that forms the connection between the
electrolyte and the external electrical circuit in 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.
Activation energy - ANS- The minimum energy required by colliding particles for
reaction to occur.
Alkane - ANS- A saturated hydrocarbon with the general formula= CnH2n+2
Alkene - ANS- An unsaturated hydrocarbon with the general formula = CnH2n
Alloys - ANS- Mixtures of metal that are made by mixing molten metals.
Ammonia - ANS- Gas that turns damp litmus paper blue.
Anion - ANS- A negatively charged ion that move towards the Anode during electrolysis.
Anode - ANS- Positive electrode, where oxidation occurs.
Atom - ANS- The smallest particle of an element that can take part in a chemical
reaction.
Base - ANS- A substance that neutralises an acid to form a salt.
Bauxite - ANS- The main ore of aluminium, from which aluminium oxide
is extracted.
Bitumen - ANS- Fraction used for road surfaces and covering flat roofs of buildings
Black - ANS- The color of iodine at rtp
Blue - ANS- The color of the precipitate produced when copper 2 reacts with aqueous
sodium hydroxide.
Brine - ANS- A concentrated solution of sodium chloride in water.
Brown - ANS- The color of the precipitate produced when Iron 3 reacts with aqueous
sodium hydroxide.
Calcium - ANS- When passed over a Bunsen burner turns flame Brick Red.
Carbon dioxide - ANS- Gas that turns lime water cloudy
, Catalyst - ANS- A substance that speeds up a chemical reaction but which is chemically
unchanged at the end of the reaction.
Cathode - ANS- Negative electrode , where reduction occurs.
Cation - ANS- A positively charged ion that move toward the Cathode during
electrolysis.
Chlorine - ANS- Gas that bleaches the color from damp litmus paper.
Compound - ANS- A substance made from two or more elements chemically bonded
together.
Covalent Bonding - ANS- The sharing of electrons between a non metal and a non metal
Cracking - ANS- The process of breaking long chain alkane molecules into short chain
alkanes and alkenes.
Cream - ANS- The color of precipitate when an Bromide reacts with dilute nitric acid and
silver nitrate solution.
Crystallisation - ANS- Method used to separate mixtures of solid dissolved in liquid,
reliant on the fact that solids are more soluble at higher temperatures.
Diesel oil - ANS- Fraction used for fuel for buses,lorries,trains and cars
Displacement reaction - ANS- A reaction in which one substance replaces another.
Distillation - ANS- Method used to separate a mixture of liquid using the differences in
their boiling points.
Dynamic equilibrium - ANS- When the rate of the forward reaction and backward
reactions in a reversible reaction mixture are equal.
Electrode - ANS- A solid electrical conductor that forms the connection between the
electrolyte and the external electrical circuit in 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.
