Level: AS Levels, A Level, GCSE – Exam Boards: Edexcel, AQA, OCR, WJEC, IB, Eduqas – Chemistry Revision Notes Energy Changes Exothermic and endothermic reactions Chemical reactions can take in or give out energy when bonds are broken and formed. Exothermic reactions Energy is released to the surroundings shown by an increase in temperature. e.g. […]

Level: AS Levels, A Level, GCSE – Exam Boards: Edexcel, AQA, OCR, WJEC, IB, Eduqas – Chemistry Revision Notes Chemical Changes The reactivity series The reactivity series is a list of metals in order of reactivity. Observations of the metals with substances such as oxygen, water have been used to place the metals. The most […]

Level: AS Levels, A Level, GCSE – Exam Boards: Edexcel, AQA, OCR, WJEC, IB, Eduqas – Chemistry Revision Notes Quantitative Chemistry Relative Atomic Mass (Ar) The relative atomic mass (Ar) of an element is its relative average mass of an atom compared to the mass of an atom of carbon-12. Image: Pixabay   Relative Formula Mass […]

Level: AS Levels, A Level, GCSE – Exam Boards: Edexcel, AQA, OCR, WJEC, IB, Eduqas – Chemistry Revision Notes The modern periodic table   Image: Pixabay   Elements are arranged in order of atomic number. The columns show the groups. The group number shows the number of electrons in the outer shell. The rows are […]

Level: AS Levels, A Level, GCSE – Exam Boards: Edexcel, AQA, OCR, WJEC, IB, Eduqas – Chemistry Revision Notes Structure, bonding and properties of matter Exam boards: Chemical bonds Atoms need a full outer shell to be stable. They will form chemical bonds in order to become more stable. There are three types of chemical […]

Level: AS Levels, A Level, GCSE – Exam Boards: Edexcel, AQA, OCR, WJEC, IB, Eduqas – Chemistry Revision Notes Elements Elements are made up of only one type of atom. Each atom in an element must have the same atomic number. All the elements on earth can be found in the periodic table. C = […]

Level: AS Levels, A Level, GCSE – Exam Boards: Edexcel, AQA, OCR, WJEC, IB, Eduqas – Chemistry Revision Notes Using resources   Using the Earth’s resources Humans have always used the earth’s resources to provide themselves with food, water, transport and shelter.  Many of the resources that humans have used in the past are finite […]

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Level: AS Levels, A Level, GCSE – Exam Boards: Edexcel, AQA, OCR, WJEC, IB, Eduqas – Chemistry Revision Notes Elements Elements are made up of only one type of atom. Each atom in an element must have the same atomic number. All the elements on earth can be found in the periodic table. Each element […]

Level: AS Levels, A Level, GCSE – Exam Boards: Edexcel, AQA, OCR, WJEC, IB, Eduqas – Chemistry Revision Notes The structure of the atom   Fig 1 – Source: Pixabay What is an atom made up of? An atom is made up of a nucleus containing protons and neutrons. Protons have a positive charge and […]