Chemistry72 views·Updated 21 Jun 2026·5 pages

GCSE AQA Chemistry Unit 10 Study Notes

Dae 🏎🪩@d_h708

Add to Google sources

Ever wondered how we turn dirty water into something safe...

1 / 5

of 5

# 4.10 Using Resources

Humans use the Earth's resources to provide warmth,
shelter, food and transport.

Natural resources, supplemented by

Using Resources and Water Treatment

You rely on natural resources for everything - your food, clothes, shelter, and energy. The key challenge is using these finite resources sustainably so future generations can meet their needs too.

Potable water (safe drinking water) isn't chemically pure - it contains some dissolved salts but has low levels of harmful substances and microbes. In the UK, we mainly use fresh rainwater from rivers and lakes, which gets filtered and sterilised with chlorine, ozone, or UV light.

When fresh water runs out, desalination turns seawater into drinking water through distillation or reverse osmosis. Reverse osmosis pushes water through special membranes under high pressure, but this requires loads of energy - making it expensive.

Key Point: Potable water contains dissolved substances but is safe to drink, whilst pure water contains no dissolved solids at all.

Sewage treatment removes organic waste and harmful microbes through screening, sedimentation, and biological processes. Industrial wastewater needs extra treatment to remove dangerous chemicals before being released back into the environment.

of 5

Extracting Copper and Life Cycle Assessments

Traditional copper mining is becoming difficult as metal ores become scarce. Two clever new methods are changing the game: phytomining uses plants that absorb copper compounds from soil, whilst bioleaching uses bacteria to extract metals from low-grade ores.

Both methods produce copper compounds that can be turned into pure copper through displacement reactions with scrap iron or electrolysis. These techniques need less energy than traditional mining and work with low-concentration ores, but they're slower and produce smaller amounts.

Life Cycle Assessments (LCAs) evaluate a product's environmental impact from raw material extraction through manufacturing, use, and final disposal. Energy and resource consumption are easy to measure, but judging pollution effects involves subjective decisions.

Key Point: LCAs aren't purely objective - companies can manipulate abbreviated assessments to support advertising claims.

The best approach is reducing, reusing, and recycling materials. Glass bottles can be reused directly or crushed and melted for new products. Metals get recycled by melting and reforming, which conserves ore reserves and reduces energy consumption.

of 5

Corrosion Prevention and Alloys

Corrosion destroys materials through chemical reactions with the environment - like when iron rusts in the presence of oxygen and water, forming flaky hydrated iron oxide. Preventing this saves money and keeps structures safe.

You can prevent corrosion by creating barriers through painting, greasing, or electroplating. Sacrificial protection uses more reactive metals like zinc (galvanising) or magnesium blocks that corrode instead of the protected metal. Aluminium naturally forms a protective oxide coating.

Alloys are mixtures of metals designed for specific purposes. Pure metals are too soft because their atoms slide past each other easily. Bronze $copper + tin$ makes decorative objects, whilst brass $copper + zinc$ creates water taps and door fittings.

Key Point: Steel alloys vary dramatically - high carbon steel is strong but brittle, whilst stainless steel resists corrosion thanks to chromium and nickel.

Different steel types serve different purposes: low carbon steel shapes easily for car bodies, high carbon steel stays hard for tools, and stainless steel resists corrosion for cutlery. Gold jewellery uses alloys measured in carats - 18 carat gold contains 75% pure gold.

of 5

NPK Fertilisers Production

Plants need nitrogen, phosphorus, and potassium to grow properly, which is why NPK fertilisers containing all three elements boost agricultural productivity. These fertilisers are carefully formulated mixtures of various salts with specific percentages of each nutrient.

Ammonia serves as the starting point for making nitrogen-containing fertilisers. It reacts with sulfuric acid to produce ammonium sulfate, or with nitric acid to create ammonium nitrate - both excellent sources of nitrogen for plants.

Phosphate rock gets mined then treated with acids to create soluble phosphorus compounds. Reacting it with nitric acid produces phosphoric acid and calcium nitrate, whilst sulfuric acid treatment creates a mixture of calcium phosphate and calcium sulfate.

Key Point: Phosphate rock cannot be used directly as fertiliser - it must be processed with acids to create water-soluble compounds that plants can actually absorb.

Modern industrial production integrates multiple processes using various raw materials. Potassium chloride and potassium sulfate provide the K component through mining operations, creating complete NPK formulations tailored to specific crop needs.

of 5

We thought you’d never ask...

What is the Knowunity AI companion?

Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.

Where can I download the Knowunity app?

You can download the app from Google Play Store and Apple App Store.

Is Knowunity really free of charge?

That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.

Most popular content: Chemistry in Society

Chemistry

Chemistry in Society Overview

Explore key concepts in N5 Chemistry, including metallic bonding, electrochemical series, metal reactions and extraction, ion-electron equations, electrolysis, plastics, fertilizers, and nuclear chemistry. This summary provides essential insights for understanding chemistry's role in society and its applications.

S33515

Chemistry

Chemistry Paper 2 Essentials

This comprehensive study resource covers key topics for Chemistry Paper 2, including energy changes in reactions, the evolution of Earth's atmosphere, combustion products, and the impact of pollutants. Ideal for exam preparation, this summary highlights essential concepts such as exothermic and endothermic reactions, fractional distillation, and the greenhouse effect. Enhance your understanding and performance in Chemistry with this focused guide.

113105

Most popular content in Chemistry

Chemistry

GCSE AQA Chemistry Topic 1- The Atom

The Atom

101,2790

Chemistry

chem paper 1

higher

112,07843

Chemistry

A-level OCR A Chemistry summary sheets

Everything from snaprevise for OCR chemistry a-level

122,29179

Chemistry

chem paper 1

Unlock the secrets of chemical reactions with this comprehensive flashcard set designed to help you conquer complex concepts and ace your Chemistry exams.

117251

Chemistry

Essential Chemistry Practicals

Explore key AQA GCSE Chemistry practicals, including flame tests, titration, and gas identification. This resource covers essential techniques for analyzing ions, making salts, and understanding reaction kinetics. Perfect for students preparing for exams and practical assessments.

1011,972902

Chemistry

AQA GCSE Chemistry 4.4 Chemical changes

4.4 Reactions of acids with bases or carbonates

97541

Chemistry

Chemistry paper 2

Chem paper 2 notes

1172514

Chemistry

Fundamentals of Atomic Structure

Practice identifying subatomic particles, calculating neutrons, and defining isotopes and atomic/mass numbers.

123460

Chemistry

Atomic Mass and Atomic Number Calculations

Calculate the number of protons, neutrons, and electrons for different elements and isotopes.

S34940

Most popular content

Sociology

Sociology of Education Overview

Explore comprehensive A-Level Sociology notes on the education system, covering key theories, policies, and sociological perspectives. This resource includes insights on marketisation, gender roles, cultural deprivation, and educational inequalities, providing a thorough understanding of how education shapes social stratification and individual achievement. Ideal for exam preparation and in-depth study.

12102,8843,041

Sociology

Sociology of Families: Comprehensive Revision

Dive into an extensive overview of family dynamics, perspectives, and patterns in sociology. This resource covers key concepts such as family diversity, gender roles, marriage, and the impact of social policies on family structures. Perfect for A-Level Sociology students preparing for Paper 2.

1273,6802,307

Criminology

Criminology: Crime & Punishment Overview

Comprehensive mindmaps covering key concepts in the Crime and Punishment topic for WJEC Criminology Unit 4. This resource includes detailed insights into the Criminal Justice System, crime prevention strategies, sentencing models, and the roles of various agencies. Ideal for A-Level revision, ensuring you grasp essential theories and legislative processes to excel in your exams.

1254,8731,059

Sociology

Comprehensive Crime & Deviance Overview

Explore an extensive revision of crime and deviance topics, including theories, types of crime, and the impact of media. This resource covers key concepts such as Marxism, functionalism, gender and crime, and the influence of globalization on criminal behavior. Ideal for students seeking a thorough understanding of criminology and its various theories. Type: Full Topic Revision.

1251,6591,399

Biology

Cell Biology and Cell structure

cell structures

93,2520

English Literature

An Inspector Calls: Character Insights

Explore in-depth analysis and key quotes for characters in J.B. Priestley's 'An Inspector Calls'. This resource covers Gerald Croft, Inspector Goole, Sheila Birling, Mrs. Birling, Eric Birling, and Eva Smith, focusing on themes of class, gender roles, and social responsibility. Ideal for students aiming for Grade 8 and above.

1025,434907

Criminology

WJEC Unit 4 Criminology

Criminology unit 4 detailed revision note

127,155125

Criminology

Criminology Theories Overview

Explore key criminology theories and their implications on crime and deviance. This comprehensive summary covers biological, psychological, and sociological perspectives, including labelling theory, right realism, and the impact of social campaigns on policy development. Ideal for A-Level criminology students seeking to understand the complexities of criminal behaviour and the factors influencing crime prevention strategies.

129,762210

English Literature

Romeo and Juliet: Key themes

Key Romeo and Juliet themes and analysed quotes

106,712198

Can't find what you're looking for? Explore other subjects.

Students love us — and so will you.

4.6/5App Store

4.7/5Google Play

The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.

Stefan SiOS user

This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.

Samantha KlichAndroid user

Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.

AnnaiOS user

Chemistry72 views·Updated 21 Jun 2026·5 pages

GCSE AQA Chemistry Unit 10 Study Notes

Dae 🏎🪩@d_h708

Add to Google sources

Ever wondered how we turn dirty water into something safe to drink, or why your phone contains recycled metals? This topic explores how humans use Earth's resources responsibly, from treating water and extracting metals to preventing rust and making fertilisers...

of 5

Using Resources and Water Treatment

Key Point: Potable water contains dissolved substances but is safe to drink, whilst pure water contains no dissolved solids at all.

of 5

Extracting Copper and Life Cycle Assessments

Key Point: LCAs aren't purely objective - companies can manipulate abbreviated assessments to support advertising claims.

of 5

Corrosion Prevention and Alloys

Key Point: Steel alloys vary dramatically - high carbon steel is strong but brittle, whilst stainless steel resists corrosion thanks to chromium and nickel.

of 5

NPK Fertilisers Production

Key Point: Phosphate rock cannot be used directly as fertiliser - it must be processed with acids to create water-soluble compounds that plants can actually absorb.

of 5