chemical analysis

Created by

meg

Cards (20)

what does a pure substance contain?
One type of element or one type of compound
How can you tell if a substance is pure?
If it melts/solidifies at one temperature (the melting point), or if it boils/condenses at one temperature (boiling point)
how can you tell is a substance is impure?
If it doesn't melt or boil at one temperature but changes state over a range of temperatures
what is a formulation?
A mixture that has been carefully designed to have specific properties for a specific purpose
what happens to the components in formulations?
They are carefully controlled
what are examples of formulations?
-fuels
-cleaning agents
-paint
-medicines
-alloys
-fertilisers
-foods
what does chromatography involve?
A stationary phase, which does not move, and a mobile phase, which moves.
what is the stationary phase in chromatography?
The absorbent paper
what is the mobile phase in chromatography?
The solvent ,which is often water
what happens during chromatography?
Mixtures are separated into their constituent components
what does the solvent do in chromatography?
Dissolves the samples and carries them up the paper.
how do you test for hydrogen?
Squeaky pop test: when mixed with air, it burns with a squeaky pop.
what are the properties of hydrogen?
-colourless gas
-combines violently with oxygen when ignited
how do you test for chlorine?
It turns damp indicator paper white
what are the properties of chlorine?
It is a green poisonous gas that bleaches dye.
how do you test for oxygen?
It relights a glowing splint
what are the properties of oxygen?
-colourless gas
-helps fuels burn more readily than in air
how do you test for carbon dioxide?
When bubbled through limewater, turns limewater cloudy.
what are the properties of carbon dioxide?
-colourless gas
Formulations are mixtures that have been designed for a specific purpose. The quantity of each component is carefully measured so the product has the properties needed