Science, asked by lakshya2005chhetri, 23 hours ago

are impure substance always harmful

Answers

Answered by Meera1tiwari
1

Answer:

Homepage

Accessibility links

Skip to content

Accessibility Help

Sign in

Home

News

Sport

More

Search

BitesizeAll Bitesize

KS3

Pure and impure chemical substances

Part of

Chemistry

Pure and impure substances

Add to My Bitesize

Revise

Test

1

2

3

4

5

Pure chemical substances

A glass of mineral water is not pure water

Food and drink may be advertised as ‘pure’. For example, you may see cartons of ‘pure orange juice’ or ‘pure mineral water’. This means that nothing else was added to the orange juice or mineral water during manufacture. However, these substances are not pure to a scientist. In science, a pure substance contains only one element or compound.

Mineral water is mostly water, but there are other substances mixed with it. These are the ingredients that you see listed on the bottle’s label.

Mineral water is a mixture of water and other substances

Completely pure water would only contain water molecules, and nothing else

If you could see the particles in pure water, you would only see water molecules. There would be no other particles. It is difficult to get completely pure substances – there will almost always be other substances mixed in. Even the most pure water will contain dissolved gases from the air. Impurities in a substance will affect its properties. For example, they may change its boiling point.

1

2

3

4

5

Glossary

Struggling to get your head round revision or exams?

Our tips from experts and exam survivors will help you through.

Get advice here

Links

BBC Science

BBC Science and Environment

BBC Earth

BBC Click

BBC Bang Goes the Theory

TeachItSUBSCRIPTION

Headsqueeze

Khan Academy

Educational App StoreSUBSCRIPTION

KS3 Subjects

Explore the BBC

Home

News

Sport

Reel

Worklife

Travel

Future

Culture

Music

TV

Weather

Sounds

Terms of Use

About the BBC

Privacy Policy

Cookies

Accessibility Help

Parental Guidance

Contact the BBC

Get Personalised Newsletters

Advertise with us

AdChoices / Do Not Sell My Info

Copyright © 2021 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking.

Similar questions