Chemical Analysis Flashcards
What are pure substances
Substances that contain only 1 type of element or compound
Compare pure and non pure substance melting point
Pure melts sharply at a single point
Non-pure melts over a range of temperatures
What are formulations
Mixtures of compounds or substance that do not react with each other
Example of formulations
Deodrants, sun cream, medicines
When is chromatography used
Separate mixture of soluble substances
Mobile phase
Solvent
Stationary phase
Paper
Pure substances in chromatography have
1 spot
Rf value equation
Distance travelled by substance/ distance travelled by solvent
Chromatography practical
1 cm pencil line from bottom of absorbtion paper
Use pipette to drop small spots of the substances onto the pencil line
Pour solvent into beaker and hang stationary phase so the solvent just touches the bottom of the paper
Solvent moves up paper
Remove paper just before solvent reached top
Measure distance traveled by solvent
Measure distance travelled by each ink spot
Workout Rf values and compare
Test for hydrogen
Squeaky pop test
Lit splint pops
Test for oxygen
Splint relights
Test for Carbon dioxide
When ran through limewater turns cloudy
Test for chlorine
Litmus paper turns white
What is used to put metals into a flame in the flame test
Nichrome wire
