Chemical analysis

Question 1

how do you test the purity of a substance?

Answer 1

the melting or boiling point of an object or the boiling point of an object. If it melts at the specific temperature for the element/substance it is pure.

Question 2

what are formulations?

Answer 2

mixtures of substances to complete a desired task i.e. paint, cake

Question 3

What are the two phases of chromatography and what do they entail?

Answer 3

A mobile phase - molecules can move. This is always with a liquid or a gas
A stationary phase - where the molecules can’t move . This can be a solid or a really dense liquid

Question 4

what happens to a substance undergoing chromatography?

Answer 4

An equilibrium is formed between the two phases

Question 5

how do you test for chlorine?

Answer 5

check if it turns damp litmus paper white

Question 6

how do you test for oxygen?

Answer 6

put a glowing splint inside a test tube, if it re-ignites oxygen is present

Question 7

how do you test for Carbon dioxide?

Answer 7

bubbling carbon dioxide through an aqueous solution of calcium hydroxide, if the solution goes from colourless to cloudy, CO2 is present

Question 8

how do you test for Hydrogen?

Answer 8

hold a lit splint over a test tube, if a popping sound is made hydrogen is present.