Chemical analysis Flashcards
1
Q
In chemistry, what is a pure substance?
A
Something made of only one type of substance.
2
Q
What is the difference between the melting boiling points of a pure and impure substance?
A
- Pure = Sharp / one specific temperature
- Impure = Broad / occur across a range of temperatures
3
Q
What is a formulation?
A
A mixture designed for a specific purpose.
4
Q
What are some examples of formulations?
A
- Fuels
- Cleaning agents
- Paints
- Medicines
- Alloys
- Fertilisers
- Foods
5
Q
What is chromatography?
A
A process of separating coloured mixtures.
6
Q
How is Rf calculated?
A
Distance moved by substances / distance moved by solvent
7
Q
What is a test for hydrogen (H)?
A
A lit splint gives a squeaky pop.
8
Q
What is a test for oxygen?
A
Re-lights a glowing splint
9
Q
What is the test for carbon dioxide?
A
Turns limewater milky if bubbled through
10
Q
What is a test for chlorine?
A
Bleaches damp litmus paper white.
