Chemical Analysis Flashcards
What does the word pure mean in chemistry
A pure substance contains only one type of element or one type of compound
Is pure substances only have_____type of element or one type of compound,they also melt and solidify at one temperature called the______
And boil and condense at one temperature called the ________
- one
- melting point
- boiling point
In everyday language what is a pure substance
Pure substance is simply one that has nothing added to it for example pure milk
What are impure substances,compound or mixture?
Mixtures
What do impure substances not do that pure substances do?
Melt or boil at one temperature,instead they change state over a vary of temperatures
What are exactly are formulations
mixtures that have been carefully designed to have specific properties for example fuels cleaning agents paints medicines etc
Which two phases does chromatography involve
Stationary phase which does not move and the mobile phase which does move
In paper chromatography what is the stationary phase on what is the mobile phase
The stationary phase is the absorbent paper and the mobile phases is the solvent
What does chromatography separate mixtures into
The constituent components
Does chromatography identify natural or artificial colours
Artificial, and does this by comparing into the results obtained from known substances
What can the RF value be used to identify
The components in a mixture
Different components have different___________
RF values
How do you test for hydrogen
When mixed with a Burns with a squeaky pop
What does hydrogen not mix well with
It combines violently with oxygen when ignited
How do you test for chlorine
It turns a dump indicator paper white
