National Chemistry

 

8.7 Calculations involving

 

                                  mass in question  =       mole  

                                                                  mass of 1 mole

 

concentration is written as "mol/litre" which is a division

 

                               concentration =     mole

                                                             litre

 

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Techniques for monitoring the environment and methods for reducing pollution and titration with calculations.

 

Chemists play an important role in society by monitoring our environment to ensure that it remains healthy and safe and that pollution is tackled as it arises.

 

A variety of methods exist which enable chemists to monitor the environment both qualitatively and quantitatively, such as acid/base titration,

 

 

precipitation

Two soluble solutions can react to produce a solid precipitate (insoluble salt) -called                              

PRECIPITATION.  

 

silver nitrate            +  sodium chloride               -----> silver chloride  +  sodium nitrate

 soluble                         soluble                                          insoluble           soluble

Ag+(aq) +   NO3-(aq) +  Na+(aq) + Cl-(aq)----->                   AgCl(s) +      Na+(aq)+ NO3-(-(aq)

 

spectator ions;

 NO3-(aq) and Na+(aq) do not take part in the reaction so are called spectator ions

 

Flame testing

Certain metal ions cause burn with distinctive colours. These are listed in the dat book

 

National 4 and 5 Chemistry

Analysis

 

These notes are for the Scottish National Chemistry course taught in fourth year in most Scottish schools.

 

The notes available here are concise notes. They are NOT to be considered as material to learn from - they are for revision.

 

 The notes are arranged under the following topics

 

National 3        Unit 1

                          Unit 2

                          Unit 3

 

National 4 and 5  Unit 1        Rates of Reaction

                                                  Atomic Structure

                                                  Bonding and Properties

                                                  Acids and bases

 

National 4 and 5  Unit 2       Fuels and Homologous Series

                                                Consumer Products

                                                Carbohydrates

 

National 4 and 5  Unit 3         Metals

                                                   Plastics

                                                   Fertilisers

                                                   Nuclear Chemistry

                                                  Chemical analysis

 

 

 

 

 

 

 

 

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