A single element or compound that is not mixed with any other substance.
1 of 18
Why is a substance such as glucose (C6 H12 O6) still considered a pure substance?
Because it only contains glucose molecules.
2 of 18
What is a formulation? Give 5 examples.
A mixture that has been designed as a useful product. For example foods, paints, fuels, medicines and fertilisers.
3 of 18
How do you carry out a chromatography?
SEE INFORMATION CARDS LABELLED CHROMATOGRAPHY METHOD.
4 of 18
How do you work out the retention factor (Rf) in a paper chromatography?
Distance travelled by compound / Distance travelled by solvent
5 of 18
How does paper chromatography work?
Substances that have a stronger attraction to the solvent move quickly and travel up the paper. Substances with a strong attraction to the PAPER will move slowly and not travel very far up the paper.
6 of 18
How do you test for oxygen?
Insert a glowing splint into a tube of gas, if the splint relights, then the gas is oxygen.
7 of 18
How do you test for hydrogen?
Insert a burning splint into a tube of gas, if there is a squeaky pop sound, then the gas is hydrogen.
8 of 18
How do you test for carbon dioxide?
The gas is shaken/bubbled through limewater (a calcium hydroxide solution), if the limewater goes cloudy, then the gas is carbon dioxide.
9 of 18
How do you test for chlorine?
Insert damp litmus paper in to the gas, if it bleaches, then the gas is chlorine.
10 of 18
How do you test for cations?
Either flames tests OR adding sodium hydroxide.
11 of 18
When sodium is held over a flame, what colour does the flame turn? Potassium? Calcium? Copper? Lithium?
When mixed with a sodium hydroxide solution, what colour precipitate does copper (II) form? Iron (II)? Iron (III)?
Blue. Green. Brown.
13 of 18
When mixed with a sodium hydroxide solution, what colour precipitate does magnesium form? What about when more sodium hydroxide is added? Calcium? Aluminium?
White. The precipitate remains white. // White. The precipitate remains white. // White. The precipitate dissolves.
14 of 18
How do you test for anions? What should be seen?
Carbon- Limewater test. (It should turn cloudy) Sulfate- Add dilute hydrochloric acid the a barium chloride solution. (It should form a white precipitate) Halides- Add dilute nitric acid then a silver nitrate solution.
15 of 18
In the test for halide ions, how do you test for chloride? Bromide? Iodide?
White. Cream. Yellow.
16 of 18
What is flame emission spectroscopy used for?
To identify metal ions in a solution and measure their concentration.
17 of 18
What are the benefits and drawbacks of flame emission spectroscopy?
+ It is very good at indentifying ions and has a large range. - It destroys the sample and is very expensive.
18 of 18
Other cards in this set
Card 2
Front
Why is a substance such as glucose (C6 H12 O6) still considered a pure substance?
Back
Because it only contains glucose molecules.
Card 3
Front
What is a formulation? Give 5 examples.
Back
Card 4
Front
How do you carry out a chromatography?
Back
Card 5
Front
How do you work out the retention factor (Rf) in a paper chromatography?
Comments
No comments have yet been made