analysis Flashcards
what is analysis in chemistry
proving what we have
what is a chemical test in analysis
reacting something with something else
e.g. react an alkene with bromine water and it changes from orange to colourless
what are physical tests in analysis
melting points and boiling points tests
what are the 3 ways to analyse substances
chemical, physical tests and spectroscopy
what are the 2 types of spectroscopy’s and what are they used for
infrared - covalent bond movement
mass spectroscopy - breaking organic molecules into smaller pieces (fragments)
how do mass spectrometers work
sample is vapourised in vaporiser
accelerated in ions beam
magnetic field changes their path and they are detected on the detector
how is spectrometry used in the real world
police use it to find drugs looking for a single peak
how is spectrometry used in organics
RFM of fragments of molecule will show peaks
helping being able to tell structural isomers apart
what does the height of the peak mean in spectrometry
it doesn’t mean anything - just look where the peaks are
are fragments negative or positive and how do you know this
positive
electrons bombard sample
what is the name you assign the position at Mr
M+
what do you do to peaks you cant assign
don’t worry - ignore them
what direction do you work with the molecule when finding fragments
start with the whole molecule and work backwards - find breaks between C-C / C-N / C-O / O-H -
