Mychem

Notes, explanations and resources for KS3, GCSE and A level Students of chemistry

Redox Chemistry

Oxidation and reduction reactions are very commonplace and therefore occupy an important place in A level chemistry . Before tackling this topic you should ensure that you can: use the OIL RIG mnemonic to decide if a reaction is oxidation or reduction recall the reactivity series for metals, carbon and hydrogen work out simple ionic ...
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Intermolecular forces

Before tackling this topic make sure you are  able to: ​ ​ ​ explain the difference between inter molecular and intra molecular forces.  use electronegativity values  to work out dipoles within molecules use ideas about molecular shapes and dipoles to predict whether or not a molecule is polar.  Trends in Boi...
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Energy changes

Whenever a chemical change takes place there is also an energy exchange of some sort. Sometimes the energy exchange is a release of energy . A fuel is a substance which can be made to react and release energy in a useful form. ​Examples of some exothermic reactions . ​This shows a range of chemical changes - all of which release energy . In so...
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Atomic structure

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Your carbon footprint

reducing your carbon footprint Although this is aimed at students of the IB diploma - it is relevant to all .... Enter your text here ...
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Acids, Bases, pH, Indicators and Buffers

Background  ​This topic is mostly about equilibria so it is important for students to understand that concept first. Before tackling this topic make sure you : ​ understand dynamic equilibria can write and manipulate equilibrium expressions for a range of reactions . can estimate the pH value of a solution using universal indicator  ...
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Acids, Alkalis and pH

Background  ​ You should already know that: • some substances are acidic • the opposite of acidic is alkaline  • acids and alkalis can be harmful  • we can measure acidity or alkalinity using the pH scale Strong acids ​When an acid molecule ionises completely when in solution in water, it is regarded as a strong acid. It is said...
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Carboxylic Acids

Carboxylic acids can occur naturally : When alcohols are oxidised they can produce a type of acid known as a carboxylic acid.    one example of a carboxylic acid is ethanoic acid . This is also known as Acetic acid and is the acid found in vinegar. Other examples of carboxylic acids are methanoic acid ( also known as formic acid)  wh...
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Addition Polymers and condensation polymers

​Polymers are a very important group of compounds. Many organic ( carbon based)  molecules can be made to Polymerise. The word "poly" means many.  When a molecule is polymerised the ( usually short) monomer molecules join up with one another to form very long polymer molecules. Addition Polymerisation These two videos show ...
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Methane, Ammonia and Water

​The images in this slideshow here show how we can account for the way in which electrons are shared between atoms. This produces a full outer shell of electrons for the atoms involved and results in the formation of stable molecules.  Use the three buttons to the top to see three different representations of the molecules
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Reduction of iron

See iron being formed in this violent, reduction reaction.  Iron III oxide and Aluminium react with one another .  Pure iron is produced. Try to write word equations for this reaction  What is reduced in this reaction?  What is oxidised? Magnesium ribbon is used as the fuse. Main reaction  Fuse  reaction Symb...
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Particle Theory

This page will help discussion of the nature of matter ​This animation helps to explain the observations in the first video A look at the mathematics !
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