C13 Chemical Analysis

Question 1

In chemistry what is a pure substance?

Answer 1

Something made of only one type of substance

Question 2

What is the difference between the melting and boiling points of a pure and a impure substance?

Answer 2

Pure-sharp/one specific temperature 🤒
Impure-broad/occur across a range of temperatures 🤒

Question 3

What is a formulation?

Answer 3

A mixture designed for a specific purpose

Question 4

What r some examples of formulation?

Answer 4

Fuels, cleaning agents, paints, medicines, alloys, fertilisers and foods 🍕

Question 5

What is chromatography?

Answer 5

A process for separating coloured mixtures

Question 6

How is Rf calculated?

Answer 6

Rf = distance moved by substance divided by distance moved by solvent

Question 7

What is the test for hydrogen?

Answer 7

A lit splint gives a squeaky pop

Question 8

What is the test for oxygen?

Answer 8

Re-lights a glowing splint

Question 9

What is the test for chlorine?

Answer 9

Bleaches damp litmus paper white