Chemistry Igcse
1) Demonstrate understanding of the terms atom and molecule.
Atom= Smallest Unit of Matter
Molecule= 2 or more atoms chemically bonded. 2) Describe paper chromatography. 3) Interpret simple chromatograms.
A method used to separate a Solution, using a Paper and a beaker of water. The Substances in the Paper go up depending on their Mass. We can say that a Solution has the same substance as another solution because they form a line of the same height. 4) Describe methods of separation and purification: filtration, crystallisation, distillation, fractional distillation.
Filtration: A way of separating Insoluble Solids from Liquids. With Filter Paper and a Funnel.
Crystallisation: Separating Liquids from soluble Solids. Done in Petri dish.
Distillation: Separating Liquids depending on their Boiling points.
Fractional Distillation: Same as Distillation but separating more than two Substances with different Boiling Points.
5) Understand the importance of purity in substances in everyday life, e.g. foodstuffs and drugs.
If the substances are not pure they can harm you. If they have something toxic within them, if their concentration is too high or too low won’t work as well.
6) Identify substances and assess their purity from melting point and boiling point information.
Pure substances have a Boiling and Melting point that is fixed. But when a substance is not pure, the Melting Point goes down and the Boiling point rises. 7) Suggest suitable purification techniques, given information about the substances involved.
Purification techniques are the ones mentioned in number 4) 8) Identify physical and chemical changes, and understand the differences between them.
Physical: Physical changes are only of Sate; Gas, Solid or Liquid.
Chemical: They are changes that involve a chemical reaction and are not easy to revert.
9) Describe the differences between elements, compounds and mixtures. 10) Demonstrate understanding
Atom= Smallest Unit of Matter
Molecule= 2 or more atoms chemically bonded. 2) Describe paper chromatography. 3) Interpret simple chromatograms.
A method used to separate a Solution, using a Paper and a beaker of water. The Substances in the Paper go up depending on their Mass. We can say that a Solution has the same substance as another solution because they form a line of the same height. 4) Describe methods of separation and purification: filtration, crystallisation, distillation, fractional distillation.
Filtration: A way of separating Insoluble Solids from Liquids. With Filter Paper and a Funnel.
Crystallisation: Separating Liquids from soluble Solids. Done in Petri dish.
Distillation: Separating Liquids depending on their Boiling points.
Fractional Distillation: Same as Distillation but separating more than two Substances with different Boiling Points.
5) Understand the importance of purity in substances in everyday life, e.g. foodstuffs and drugs.
If the substances are not pure they can harm you. If they have something toxic within them, if their concentration is too high or too low won’t work as well.
6) Identify substances and assess their purity from melting point and boiling point information.
Pure substances have a Boiling and Melting point that is fixed. But when a substance is not pure, the Melting Point goes down and the Boiling point rises. 7) Suggest suitable purification techniques, given information about the substances involved.
Purification techniques are the ones mentioned in number 4) 8) Identify physical and chemical changes, and understand the differences between them.
Physical: Physical changes are only of Sate; Gas, Solid or Liquid.
Chemical: They are changes that involve a chemical reaction and are not easy to revert.
9) Describe the differences between elements, compounds and mixtures. 10) Demonstrate understanding