Chemistry analysis Flashcards
What is a pure substance
An element or compound not mixed with any other substance
What is a formulation and how is it made?
A mixture that has been purposefully as a useful product
e.g medicines, alloys, cleaning agents
How is Rf calculated?
Distance moved by the spot / distance moved by component
What is flame spectrometry
The wavelengths of light emitted by metals ions when they are heated up
What is the advantages of using instrumental methods?
They are very accurate
sensitive
and fast
Why do scientists use flame emission spectrometry
Can show multiple ions present in a sample
and
The intensity of the lines show the concentration of the metal ion present
What colour flame does lithum make?
Crimson red
colour of sodium ions
Yellow
Colours of K+ ions
lilac
Colours of calcium ions
orange
Colour of CU+ ions
blue/green
What precipate is formed when NaOH reacts with a solution containing
Calcium
Magnesium
Aluminium ions
A white precipice is formed
However if extra NaOH is added to Aluminium it’s precipitate will dissolve
compound colour formed when Iron ( III) is formed
brown
Colour compound formed when copper reacts with NaoH?
A blue compund
colour compound made with CL- with silver nitrate?
White precipitate
