Mychem

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

Forming a lattice

The images below show how an ionic lattice forms 
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A Kp problem

Enter your text here ... ​This problem looks at Kp and the values of partial pressures for Sulphur dioxide and oxygen  ​Click to see the presentation Enter your text here ...
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Flame emission spectroscopy

Flame tests can be used to identify some metal ions (cations). Lithium, sodium, potassium, calcium and copper compounds produce distinctive colours in flame tests: • lithium compounds result in a crimson flame • sodium compounds result in a yellow flame • potassium compounds result in a lilac flame • calcium compounds result in an orange-red flame • cop...
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Electrode potentials

Enter your text here ... Enter your text here ... ​Redox chemistry and equilibria
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The Transition Metals

What do the images above have in common? they are all show coloured substances. in each case the color is due to the presence of transition metal compounds. transition metals are responsible for a lot of naturally occurring colors Don't try this at home!  Questions:

transition metal questions

What can you ...
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chromatography

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Refraction and reflection

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Extending the Carbon Chain (OCR)

​Sometimes in organic synthesis there is a need to extend the length of a carbon chain . This can be achieved in a few different ways: 
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The Halogens

Enter your text here ... The halogens are a family of elements in group 7 (aka 17) of the periodic table. in this video, you can see how reactive the halogens can be. you can also see the characteristic colours of: ​ ​ ​ chlorine; a pale green gas bromine; a volatile orange-brown liquid. iodine; a shiny grey metallic-looking solid wi...
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NMR Spectroscopy

This animation shows how hydrogen nuclei can be thought of as tiny bar magnets  ​Proton NMR produces a spectrum with a  number of peaks.  The number of peaks corresponds to the number of different chemical environments in which protons exist.  High resolution NMR - reveals a splitting pattern Enter your text ...
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Electricity and Magnetism

The motor effect ​When a current passes through a conductor in a magnetic field, the conductor experiences a force. This force is used to provide the motion which drives electric motors. It is therefore known as the Motor Effect Enter your text here ... Enter your text here ...
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alkanes and alkenes

the alkanes are a family of hydrocarbons. hydrocarbons are compounds containing hydrogen and carbon only. methane is the simplest hydrocarbon with the formula CH 4 . the rest of the "family" (aka:  homologous series)   is below: ​Methane CH 4 Ethane C 2 H 6 Propane C 3 H 8 Butane C 4 H 10
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Electronegativity

 Electronegativity values allow us to predict the direction and strength of dipoles which might exist in molecules
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Electricity

Symbols used in electrical circuit diagrams:  Enter your text here ... Enter your text here ...
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Ionic Bonding

Conductivity when molten  Background ​When a metal combines with a non metal - the compound formed is usually ionic. Ionic compounds tend to form giant lattices. Ionic lattices have some distinctive physical properties: High melting points Conduct an electric current when molten​ They form crystals Many will dissolve well in water The vid...
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The Alkali metals

An overview of the alkali metals reacting with water. notice that all the metals react in the same way with water to produce hydrogen gas and an alkaline solution of the hydroxide of the metal. alkali metal + water  --> alkali metal hydroxide + hydrogen gas however the equations given in the video do not make proper use of subscripts N...
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The formulae of ionic compounds

Sodium chloride Ionic compounds form infinite ionic lattices so the formula is given by the empirical formula, showing only the (simplest) mole ratio between the cations and the anions. We can work out this ratio by the charges of the ions.  Remember: The total charge of an ionic compound is always zero. With sodium chloride: ​ the Chloride io...
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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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