C8 - Chemical analysis Flashcards
What is the test for hydrogen?
A lit splint makes a squeaky pop.
What is the test for oxygen?
A glowing splint relights.
What is the test for carbon dioxide?
Limewater turns cloudy (calcium carbonate forms) once the gas is bubbled through.
What is the test for chlorine gas?
Damp blue litmus paper is bleached.
Which test can be used to test for lithium ions?
A crimson flame from a flame test.
Which test can be used to test for sodium ions?
A yellow flame from a flame test.
Which test can be used to test for potassium ions?
A lilac flame from a flame test.
Which two tests can be used to test for calcium ions?
- An orange-red flame from a flame test
- A white precipitate when sodium hydroxide solution is added
Which two tests can be used to test for copper II ions?
- A green flame from a flame test
- A blue precipitate when sodium hydroxide solution is added
Which test can be used to test for iron II ions?
A green precipitate when sodium hydroxide solution is added.
Which test can be used to test for iron III ions?
A brown precipitate when sodium hydroxide solution is added.
Which test can be used to test for magnesium ions?
A white precipitate when sodium hydroxide solution is added.
Which test can be used to test for aluminium ions?
A white precipitate when sodium hydroxide solution is added. This will dissolve once sodium hydroxide solution is in excess.
Which test can be used to test for chloride ions?
A white precipitate when nitric acid then silver nitrate are added.
Which test can be used to test for bromide ions?
A cream precipitate when hydrochloric/nitric acid then silver nitrate are added.
Which test can be used to test for iodide ions?
A yellow precipitate when hydrochloric/nitric acid then silver nitrate are added.
Which test can be used to test for carbonate ions?
A fizz when added to acid AND limewater turning cloudy when bubbled through.
Which test can be used to test for sulfate ions?
A white precipitate when hydrochloric acid then barium chloride are added.
Define purity in terms of chemistry.
A substance that is made up of just one substance. That substance can be either an element or a compound.
Define purity in terms of advertising.
A substance ‘has had nothing added to it’ and that it is in its natural state.
Define purity in terms of advertising.
A substance ‘has had nothing added to it’ and that it is in its natural state.
What do impurities do to the boiling and melting points of a substance?
Decrease them.
What is a formulation?
A mixture that has been designed to produce a useful product.
What is the stationary phase in chromatography?
The paper.
What is the mobile phase in chromatography?
The solvent.
How is the Rf value calculated?
distance moved by chemical ÷ distance moved by solvent
