GCSE Chemistry Unit 3 Revision

Instrumental Methods

• Machines can help us to analyse unknown substances.
• They are useful for medical purposes, police work, environmental analysis, athletics (drug testing), etc.
• Technological advances have made more advanced analysis possible.
• Advantages - Can be done by technicians, not only trained chemists like lab tests. More accurate than lab tests. Much faster than lab methods and tests can be automated. 
• Disadvantages - Very expensive to run, buy and maintain the machines.
• To identify metals, atomic absorption spectroscopy is used.
• The patterns of light absorbed by the metals in the sample…