Topic 8 - Chemical Analysis

Question 1

What is a pure substance?

Answer 1

A substance that only contains one compound or element throughout

Question 2

How can you test the purity of a substance?

Answer 2

Test it’s MP and BP and then compare it to that of the pure substance which can be found in a data book, the closer it is the purer the substance is

Question 3

What are formulations

Answer 3

Useful mixtures that are made by following specific instructions .e.g. NaCl

Question 4

Why are measurements in a formulation important?

Answer 4

Each component individually contributes its own properties to the formulation too much or too little could either over or under emphasise that property

Question 5

How do you tests for chlorine?

Answer 5

It bleaches litmus paper turning it white

Question 6

How do you test for oxygen?

Answer 6

It will relight a glowing splint

Question 7

How do you test for CO2?

Answer 7

When mixed with lime water it will cause it to turn cloudy

Question 8

How do you test for hydrogen?

Answer 8

If you hold a burning splint to it, it will cause a squeaky pop