chemical analysis:

Created by

Niamh Gleadow

Cards (17)

what is a pure substance
contains only one types of particle and has a fixed melting and boiling point
what is a mixture
contains two or more substances that not chemically bonded and has a dang of melting and boiling points
what is chromatography used for
separate different components of a mixture
what is the stationary phase in chromatography
the material which is usually paper that doesn’t move
what is the mobile phase in chromatography
The solvent that moves through the stationary phase carrying the components of the mixture
what is the RF value in chromatography?
The ratio of the distance travelled by a component to the distance travelled by the solvent front
What is the purpose of a flame test
It is used to identify metal ions based on the colour of the flame produced
What colour flame does lithium produce in a flame test? 
Red flame
What colour flame does copper produce in flame test?
A blue green flame
How do you test for oxygen gas?
Place a glowing splint into the gas if oxygen is present, the splint will relight
How do you test for carbon dioxide gas?
But the gas through lime water if carbon dioxide is present the lime water will turn cloudy
How do you test for hydrogen gas?
Hold a lit splint near the gas if hydrogen is present it will produce a squeaky pop sound
How do you test for chloride ions?
Add silver nitrate solution, a white precipitate if chloride ions are present
How do you test for sulphate ions?
Add barium chloride solution a white precipitate forms of sulphate ions are present
How do you test for carbonate ions?
Add dilute acid to the sample carbonate ions are present carbon dioxide will be produced which turns lime water cloudy
How do you test for calcium ions?
Add sodium hydroxide a white precipitate forms of calcium ions are present
How do you test for copper ions?
Add sodium hydroxide are blue precipitate forms if copper ions are