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L
Lipxin Tang
01/09/2025
Chemistry
GCSE Chemistry C6: Rate and extent of chemical change
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1 Sept 2025
•
GCSE Chemistry C6: Rate and Extent of Chemical Change Notes and Questions
L
Lipxin Tang
@ljtang
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Understanding Rate and Extent of Chemical Change
The C6 rate and extent of chemical change unit is a crucial part of GCSE chemistry, covering fundamental concepts that explain how and why chemical reactions occur at different speeds and to varying degrees of completion.
Equilibrium and Le Chatelier's Principle
Equilibrium in chemical reactions occurs when the forward and reverse reactions proceed at the same rate in a sealed container. This dynamic state is crucial for understanding many chemical processes.
Definition: Equilibrium is achieved when the rates of forward and reverse reactions are equal in a closed system.
Le Chatelier's Principle is a fundamental concept that helps predict how a chemical system at equilibrium will respond to changes in conditions.
Quote: "If a system is at equilibrium and a change is made to any of the conditions, the system responds to counteract the change." (Le Chatelier's Principle)
Factors Affecting Rate of Reaction
Understanding the factors affecting rate of reaction is essential for GCSE chemistry C6 rate of chemical change. The five main factors are:
-
Concentration of reactants: Higher concentration leads to more frequent collisions between particles, increasing the reaction rate.
-
Pressure of gases: Increased pressure in gaseous reactions results in more particle collisions, speeding up the reaction.
-
Surface area of solid reactants: Greater surface area exposes more of the solid to react, enhancing the chance of collisions.
-
Temperature: Higher temperatures increase particle speed and energy, leading to more frequent and energetic collisions.
-
Catalysts: These substances increase the rate of reaction without being consumed in the process.
Highlight: These factors are crucial for answering rates of reaction exam questions GCSE.
Endothermic and Exothermic Reactions
Understanding the energy changes in reactions is vital:
Vocabulary:
- Endothermic reactions absorb heat from the surroundings.
- Exothermic reactions release heat to the surroundings.
Changing Conditions at Equilibrium
Le Chatelier's Principle helps predict how equilibrium systems respond to changes:
-
Pressure changes:
- Increase in pressure favors the side with fewer gas molecules.
- Decrease in pressure favors the side with more gas molecules.
-
Concentration changes:
- Increasing reactant concentration shifts equilibrium towards products.
- Decreasing product concentration shifts equilibrium towards more product formation.
-
Temperature changes:
- For endothermic reactions, increasing temperature favors product formation.
- For exothermic reactions, decreasing temperature favors product formation.
Example: In the Haber process for ammonia production, increasing pressure favors the formation of ammonia as there are fewer gas molecules on the product side.
This comprehensive overview of C6 the rate and extent of chemical change provides a solid foundation for tackling rate and extent of chemical change exam questions and understanding key concepts in GCSE chemistry.
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very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
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I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
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THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
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 S
iOS 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 Klich
Android 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.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
GCSE Chemistry C6: Rate and Extent of Chemical Change Notes and Questions
L
Lipxin Tang
@ljtang
Rate and Extent of Chemical Change: A Comprehensive Guide for GCSE Chemistry
This guide covers key concepts in C6 Chemistry GCSE, focusing on the rate and extent of chemical reactions. It explores factors affecting chemical reaction rates, equilibrium,... Show more
Understanding Rate and Extent of Chemical Change
The C6 rate and extent of chemical change unit is a crucial part of GCSE chemistry, covering fundamental concepts that explain how and why chemical reactions occur at different speeds and to varying degrees of completion.
Equilibrium and Le Chatelier's Principle
Equilibrium in chemical reactions occurs when the forward and reverse reactions proceed at the same rate in a sealed container. This dynamic state is crucial for understanding many chemical processes.
Definition: Equilibrium is achieved when the rates of forward and reverse reactions are equal in a closed system.
Le Chatelier's Principle is a fundamental concept that helps predict how a chemical system at equilibrium will respond to changes in conditions.
Quote: "If a system is at equilibrium and a change is made to any of the conditions, the system responds to counteract the change." (Le Chatelier's Principle)
Factors Affecting Rate of Reaction
Understanding the factors affecting rate of reaction is essential for GCSE chemistry C6 rate of chemical change. The five main factors are:
-
Concentration of reactants: Higher concentration leads to more frequent collisions between particles, increasing the reaction rate.
-
Pressure of gases: Increased pressure in gaseous reactions results in more particle collisions, speeding up the reaction.
-
Surface area of solid reactants: Greater surface area exposes more of the solid to react, enhancing the chance of collisions.
-
Temperature: Higher temperatures increase particle speed and energy, leading to more frequent and energetic collisions.
-
Catalysts: These substances increase the rate of reaction without being consumed in the process.
Highlight: These factors are crucial for answering rates of reaction exam questions GCSE.
Endothermic and Exothermic Reactions
Understanding the energy changes in reactions is vital:
Vocabulary:
- Endothermic reactions absorb heat from the surroundings.
- Exothermic reactions release heat to the surroundings.
Changing Conditions at Equilibrium
Le Chatelier's Principle helps predict how equilibrium systems respond to changes:
-
Pressure changes:
- Increase in pressure favors the side with fewer gas molecules.
- Decrease in pressure favors the side with more gas molecules.
-
Concentration changes:
- Increasing reactant concentration shifts equilibrium towards products.
- Decreasing product concentration shifts equilibrium towards more product formation.
-
Temperature changes:
- For endothermic reactions, increasing temperature favors product formation.
- For exothermic reactions, decreasing temperature favors product formation.
Example: In the Haber process for ammonia production, increasing pressure favors the formation of ammonia as there are fewer gas molecules on the product side.
This comprehensive overview of C6 the rate and extent of chemical change provides a solid foundation for tackling rate and extent of chemical change exam questions and understanding key concepts in GCSE chemistry.
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.
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.9/5
App Store
4.8/5
Google 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 S
iOS 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 Klich
Android 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.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
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 S
iOS 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 Klich
Android 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.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user