Chemical Analysis

Question 1

What Is A Pure Substance?

Answer 1

Something that contains only one element or compound

Question 2

What Is A Formulation?

Answer 2

A useful mixture

Question 3

How Can You Test For Chlorine Gas?

Answer 3

Dampen litmus paper

The water dissolves some of the chlorine so it can react with the indicator on the litmus paper

Question 4

How Can You Test For Oxygen?

Answer 4

Glowing splint test

Splint is lit and burnt for a few seconds and then blown out by breath or because it was shaken

Question 5

How Can You Test For Hydrogen Gas?

Answer 5

Squeaky pop test
Place a lighted splint in a test tube with the gas
If hydrogen is present a squeaky pop will be heard

Question 6

How Do You Carry Out Flame Tests?

Answer 6

Dip a clean wire loop into the compound being tested then put the loop into the edge of a blue flame of a Bunsen burner and observe the colour produced

Question 7

What Are Some Disadvantages And Advantages Of Instrumental Analysis?

Answer 7

Accurate but expensive

Question 8

How Does Flame Emission Spectroscopy Work?

Answer 8

The coloured light from a vaporised sample can be split to produce an emission spectroscope

Question 9

Why Do Metal Ions Emit Light When In A Flame?

Answer 9

Electrons get excited and jump to a higher energy level and when they relax back down the excess energy gained is released in the form of light