Analysing Substances Flashcards
What is good about instrumental methods
They are accurate, sensitive, rapid and useful when the amount of a sample is very small
Elements and compounds can be detected using ?
Instrumental methods
What can chemical analysis be used to identify
Additives in food
How can artificial colours be detected and identified
By paper chromatography
Give an example of an instrumental method
Gas chromatography
What does gas chromatography allow
The separation of a mixture of compounds
The time taken for a substance to travel through the column can be used to…
Help identify the substance
The output from the gas chromatography column can be linked to what
A mass sprectrometer
What can a mass spectrometer be used to identify
The substances leaving the end of the column
What can the mass spectrometer also do
It can give the relative molecular mass of each of the substances separated in the column
