Chemical Analysis Flashcards
what is a pure substance
a single element of compound not mixed with any other substance and a fixed bp
what is a formulation and give examples
substance made with a specific purpose eg fuel or paints
what is chromatography used for
separating mixtures to identify substances
how do you find Rf value
distance moved by substance / dust have moved by solvent
what is the test for hydrogen
burning splint held at open end of test tube of gas; lighter splint goes pop
test for oxygen
flowing splint inserted into test tube of gas , splint re lights with oxygen
test for carbon dioxide
limewater turns cloudy
test for chlorine
blue litmus paper turns white
what is the test for positive ions/ metals/ cations
dip in liquid then put in flame -> colour change
what is potassium’s flame colour change
lilac
what is sodium’s fire colour change
yellow
what is lithium’s fire colour change
crimson
what is calcium’s fire colour change
red
what is coppers fire colour change
green/blue
what is the second test for positive ions/ metals/ cations
add sodium hydroxide to liquid
