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ChemistryChemistry416 views·Updated Jun 26, 2026·14 pages

Chemistry: Energy Changes and Their Importance

J
Jessica Plane@essicalane_jeu6oyvga

Ever wondered why some reactions feel hot whilst others make...

1
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne
2
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne
3
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne
4
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne
5
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne
6
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne
7
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne
8
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne
9
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne
10
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne

We thought you’d never ask...

What is the Knowunity AI companion?

Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.

Where can I download the Knowunity app?

You can download the app in the Google Play Store and in the 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.

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Explore the fundamentals of electrode potentials and electrochemical cells in this comprehensive summary. Understand key concepts such as cell potential, half-reactions, and the Nernst equation, essential for mastering electrochemistry. Ideal for students preparing for exams or seeking to deepen their knowledge in physical chemistry.

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

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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

ChemistryChemistry416 views·Updated Jun 26, 2026·14 pages

Chemistry: Energy Changes and Their Importance

J
Jessica Plane@essicalane_jeu6oyvga

Ever wondered why some reactions feel hot whilst others make things cold? Chemical reactions either absorb or release energy, and understanding this helps explain everything from why batteries work to how your body gets energy from food.

1
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students
2
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students
3
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students
4
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students
5
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students
6
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students
7
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students
8
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students
9
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students
10
of 10
# ENDOTHERMIC
heat absorbed from
Surroundings, temperature
goes down.
more energy is needed
to break the old bonds
than is used to create
ne

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students

We thought you’d never ask...

What is the Knowunity AI companion?

Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.

Where can I download the Knowunity app?

You can download the app in the Google Play Store and in the 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: Electrochemical Cells

5
ChemistryChemistry

Chemical and Fuel Cells Overview

Explore the fundamentals of chemical and fuel cells, including the workings of hydrogen-oxygen fuel cells, electrochemical reactions, and the differences between galvanic and electrolytic cells. This summary provides key insights into energy production through electrochemistry, ideal for students studying chemistry.

92324
ChemistryChemistry

Redox Reactions & Electrode Potentials

Explore the fundamentals of redox reactions and standard electrode potentials with this comprehensive mind map. Understand half-reactions, electrochemical cells, and the principles of fuel cells. Ideal for WJEC A Level Chemistry students preparing for Units 3.1 and 3.2.

131551
ChemistryChemistry

Electrochemical Cell EMF Analysis

Explore the measurement of EMF in various electrochemical cells using different metals. This practical evaluation covers the methodology, results, and improvements for accuracy in measuring standard electrode potentials. Key concepts include galvanic cells, electric potential, and laboratory safety. Ideal for A-Level Chemistry students.

121,58912
ChemistryChemistry

Electrode Potentials Overview

Explore the fundamentals of electrode potentials and electrochemical cells in this comprehensive summary. Understand key concepts such as cell potential, half-reactions, and the Nernst equation, essential for mastering electrochemistry. Ideal for students preparing for exams or seeking to deepen their knowledge in physical chemistry.

1221410
ChemistryChemistry

Energy Changes in Reactions

Explore the fundamentals of energy changes in chemical reactions, including exothermic and endothermic processes, bond energies, and practical applications like fuel cells and electrochemical cells. This summary is ideal for AQA GCSE students preparing for exams, featuring key concepts and practical insights to enhance understanding.

961611

Most popular content in Chemistry

9

Most popular content

9
SociologySociology

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.

12102,8693,040
SociologySociology

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.

1273,6612,307
CriminologyCriminology

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.

1254,8691,059
SociologySociology

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.

1251,6541,399
C
BiologyBiology

Cell Biology and Cell structure

cell structures

93,2490
English LiteratureEnglish 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.

1025,429907
CriminologyCriminology

WJEC Unit 4 Criminology

Criminology unit 4 detailed revision note

127,151125
CriminologyCriminology

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.

129,760210
English LiteratureEnglish Literature

Romeo and Juliet: Key themes

Key Romeo and Juliet themes and analysed quotes

106,708198

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