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Jessica Harvey
19/05/2023
Chemistry
higher chemistry
394
•
19 May 2023
•
Jessica Harvey
@jessicaharvey_ooep
The document covers key concepts in Higher Chemistry Unit 3... Show more
This page delves into molar volume concepts and gas calculations, which are essential in Higher Chemistry Unit 3.
Definition: Molar volume is the volume occupied by one mole of a gas at a given temperature and pressure. At 20°C, the molar volume is 24 liters/mole.
The page presents several examples of gas calculations:
Example: In the reaction of ethene with hydrogen (C₂H₄ + H₂ → C₂H₆), 500cm³ of ethene requires 500cm³ of hydrogen for complete reaction.
These examples illustrate how to use the molar volume concept in stoichiometric calculations involving gases.
Highlight: Mastering molar volume calculations is crucial for solving problems related to gas reactions in Higher Chemistry.
This page focuses on percentage yield calculations, an important concept in Higher Chemistry Unit 3.
Definition: Percentage yield is the ratio of the actual yield to the theoretical yield, expressed as a percentage.
The page provides two detailed examples:
Formula: % yield = (actual yield ÷ theoretical yield) × 100
Example: In the production of ethyl ethanoate, 2.5g of ethanol yields 2.9g of ethyl ethanoate. The theoretical yield is 4.78g, resulting in a percentage yield of 60.7%.
These examples demonstrate how to calculate theoretical yield using stoichiometry and how to determine percentage yield from experimental data.
Highlight: Understanding percentage yield is crucial for assessing the efficiency of chemical reactions and identifying potential areas for improvement in industrial processes.
This page explores the concept of enthalpy of combustion, a key topic in Higher Chemistry Unit 3.
Definition: Enthalpy of combustion is the energy released when one mole of a substance is burned completely in oxygen.
The page provides a detailed example of calculating the enthalpy of combustion for ethanol:
Example: When 4.6g of ethanol is burned, it raises the temperature of 500cm³ of water by 57°C. Using the formula E = -cmΔT, the energy released is calculated as 119.13 kJ. This is then converted to kJ/mol, resulting in an enthalpy of combustion of -1191.3 kJ/mol for ethanol.
Key points covered:
Highlight: Understanding enthalpy of combustion is crucial for analyzing energy changes in chemical reactions and has practical applications in fuel science and thermochemistry.
This page focuses on Hess's Law and its application in enthalpy calculations, a fundamental concept in Higher Chemistry Unit 3.
Definition: Hess's Law states that the enthalpy change in converting reactants to products is the same regardless of the route by which the reaction takes place.
The page provides a detailed example of using Hess's Law to calculate the enthalpy change for the formation of propyne (C₃H₄) from its elements:
Example: The formation of propyne (3C + 2H₂ → C₃H₄) is calculated using the combustion reactions of carbon, hydrogen, and propyne. The final enthalpy change is determined to be +185 kJ/mol.
Highlight: Hess's Law is a powerful tool for calculating enthalpy changes that cannot be measured directly, making it essential for understanding complex chemical processes in Higher Chemistry.
This page explores bond enthalpy and its role in calculating energy changes in chemical reactions, a crucial topic in Higher Chemistry Unit 3.
Definition: Bond enthalpy is the energy required to break one mole of bonds in gaseous molecules.
Definition: Mean molar bond enthalpy is the average energy required to break one mole of bonds for a bond that occurs in a number of compounds.
The page covers:
Example: In the reaction H₂ + I₂ → 2HI, the energy change is calculated by summing the energies of bonds broken (H-H and I-I) and subtracting the energy of bonds formed (H-I). The result shows that the reaction is slightly endothermic.
Highlight: Understanding bond enthalpies is essential for predicting and explaining energy changes in chemical reactions, making it a fundamental concept in Higher Chemistry.
This page focuses on atom economy, an important concept in green chemistry and part of Higher Chemistry Unit 3.
Definition: Atom economy is the efficiency of a chemical reaction in terms of all atoms involved, calculated as the ratio of the mass of desired products to the total mass of reactants, expressed as a percentage.
The page provides two detailed examples of atom economy calculations:
Formula: Atom economy = (mass of desired products ÷ total mass of reactants) × 100
Example: In the production of silicon nitride, the atom economy is calculated to be 17.9%, indicating a relatively low efficiency in terms of atom utilization.
Highlight: Understanding atom economy is crucial for designing more sustainable and environmentally friendly chemical processes, aligning with the principles of green chemistry in Higher Chemistry.
This page outlines the key principles and considerations in designing industrial chemical processes, an important topic in Higher Chemistry Unit 3.
Key points covered:
Vocabulary: Feedstock - a chemical from which other chemicals can be extracted or synthesized, derived from raw materials.
Definition: Raw materials are useful substances found naturally and used in the primary production or manufacturing of goods in the chemical industry.
Highlight: Understanding these principles is crucial for developing sustainable and economically viable chemical processes, a key aspect of modern Higher Chemistry.
This page focuses on volumetric analysis and titrations, essential practical techniques in Higher Chemistry Unit 3.
Definition: Volumetric analysis is used to determine the volumes of solutions required to reach the endpoint of a chemical reaction.
Key points covered:
The page also details the process of preparing standard solutions:
Highlight: Mastering volumetric analysis techniques is crucial for accurate quantitative analysis in Higher Chemistry, with applications in various fields of chemistry and industry.
This page explores the concept of chemical equilibrium, a fundamental principle in Higher Chemistry Unit 3.
Definition: At equilibrium, the forward and backward reactions are continuing, and their rates are equal, resulting in constant concentrations of reactants and products.
The page covers key aspects of equilibrium:
Highlight: Catalysts increase the rate of both forward and backward reactions but do not affect the position of equilibrium.
Example: Temperature changes can shift the equilibrium position. For endothermic reactions, increasing temperature shifts the equilibrium towards the products, while for exothermic reactions, it shifts towards the reactants.
Understanding chemical equilibrium is essential for predicting and controlling chemical reactions in various applications of Higher Chemistry.
This page focuses on excess reactant calculations in chemical reactions. It explains how to determine which reactant is in excess and which is limiting.
Definition: Excess reactant is the substance that remains after a chemical reaction is complete, while the limiting reactant is completely consumed.
The page provides two detailed examples:
Example: In the reaction of 5g zinc with 120cm³ of 0.5M copper(II) sulfate solution, zinc is the limiting reactant with 0.076 moles, while copper(II) sulfate is in excess with 0.06 moles.
These examples demonstrate how to calculate moles using mass and molar mass (n = m ÷ gfm) for solid reactants, and concentration and volume (n = c × v) for solutions.
Highlight: Understanding excess calculations is crucial for predicting reaction outcomes and maximizing efficiency in chemical processes.
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.
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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
Jessica Harvey
@jessicaharvey_ooep
The document covers key concepts in Higher Chemistry Unit 3, including excess calculations, molar volume, percentage yield, enthalpy of combustion, Hess's Law, bond enthalpy, atom economy, chemical industry principles, volumetric analysis, and equilibrium. It provides detailed explanations, formulas, and... Show more
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This page delves into molar volume concepts and gas calculations, which are essential in Higher Chemistry Unit 3.
Definition: Molar volume is the volume occupied by one mole of a gas at a given temperature and pressure. At 20°C, the molar volume is 24 liters/mole.
The page presents several examples of gas calculations:
Example: In the reaction of ethene with hydrogen (C₂H₄ + H₂ → C₂H₆), 500cm³ of ethene requires 500cm³ of hydrogen for complete reaction.
These examples illustrate how to use the molar volume concept in stoichiometric calculations involving gases.
Highlight: Mastering molar volume calculations is crucial for solving problems related to gas reactions in Higher Chemistry.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page focuses on percentage yield calculations, an important concept in Higher Chemistry Unit 3.
Definition: Percentage yield is the ratio of the actual yield to the theoretical yield, expressed as a percentage.
The page provides two detailed examples:
Formula: % yield = (actual yield ÷ theoretical yield) × 100
Example: In the production of ethyl ethanoate, 2.5g of ethanol yields 2.9g of ethyl ethanoate. The theoretical yield is 4.78g, resulting in a percentage yield of 60.7%.
These examples demonstrate how to calculate theoretical yield using stoichiometry and how to determine percentage yield from experimental data.
Highlight: Understanding percentage yield is crucial for assessing the efficiency of chemical reactions and identifying potential areas for improvement in industrial processes.
This page explores the concept of enthalpy of combustion, a key topic in Higher Chemistry Unit 3.
Definition: Enthalpy of combustion is the energy released when one mole of a substance is burned completely in oxygen.
The page provides a detailed example of calculating the enthalpy of combustion for ethanol:
Example: When 4.6g of ethanol is burned, it raises the temperature of 500cm³ of water by 57°C. Using the formula E = -cmΔT, the energy released is calculated as 119.13 kJ. This is then converted to kJ/mol, resulting in an enthalpy of combustion of -1191.3 kJ/mol for ethanol.
Key points covered:
Highlight: Understanding enthalpy of combustion is crucial for analyzing energy changes in chemical reactions and has practical applications in fuel science and thermochemistry.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page focuses on Hess's Law and its application in enthalpy calculations, a fundamental concept in Higher Chemistry Unit 3.
Definition: Hess's Law states that the enthalpy change in converting reactants to products is the same regardless of the route by which the reaction takes place.
The page provides a detailed example of using Hess's Law to calculate the enthalpy change for the formation of propyne (C₃H₄) from its elements:
Example: The formation of propyne (3C + 2H₂ → C₃H₄) is calculated using the combustion reactions of carbon, hydrogen, and propyne. The final enthalpy change is determined to be +185 kJ/mol.
Highlight: Hess's Law is a powerful tool for calculating enthalpy changes that cannot be measured directly, making it essential for understanding complex chemical processes in Higher Chemistry.
This page explores bond enthalpy and its role in calculating energy changes in chemical reactions, a crucial topic in Higher Chemistry Unit 3.
Definition: Bond enthalpy is the energy required to break one mole of bonds in gaseous molecules.
Definition: Mean molar bond enthalpy is the average energy required to break one mole of bonds for a bond that occurs in a number of compounds.
The page covers:
Example: In the reaction H₂ + I₂ → 2HI, the energy change is calculated by summing the energies of bonds broken (H-H and I-I) and subtracting the energy of bonds formed (H-I). The result shows that the reaction is slightly endothermic.
Highlight: Understanding bond enthalpies is essential for predicting and explaining energy changes in chemical reactions, making it a fundamental concept in Higher Chemistry.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page focuses on atom economy, an important concept in green chemistry and part of Higher Chemistry Unit 3.
Definition: Atom economy is the efficiency of a chemical reaction in terms of all atoms involved, calculated as the ratio of the mass of desired products to the total mass of reactants, expressed as a percentage.
The page provides two detailed examples of atom economy calculations:
Formula: Atom economy = (mass of desired products ÷ total mass of reactants) × 100
Example: In the production of silicon nitride, the atom economy is calculated to be 17.9%, indicating a relatively low efficiency in terms of atom utilization.
Highlight: Understanding atom economy is crucial for designing more sustainable and environmentally friendly chemical processes, aligning with the principles of green chemistry in Higher Chemistry.
This page outlines the key principles and considerations in designing industrial chemical processes, an important topic in Higher Chemistry Unit 3.
Key points covered:
Vocabulary: Feedstock - a chemical from which other chemicals can be extracted or synthesized, derived from raw materials.
Definition: Raw materials are useful substances found naturally and used in the primary production or manufacturing of goods in the chemical industry.
Highlight: Understanding these principles is crucial for developing sustainable and economically viable chemical processes, a key aspect of modern Higher Chemistry.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page focuses on volumetric analysis and titrations, essential practical techniques in Higher Chemistry Unit 3.
Definition: Volumetric analysis is used to determine the volumes of solutions required to reach the endpoint of a chemical reaction.
Key points covered:
The page also details the process of preparing standard solutions:
Highlight: Mastering volumetric analysis techniques is crucial for accurate quantitative analysis in Higher Chemistry, with applications in various fields of chemistry and industry.
This page explores the concept of chemical equilibrium, a fundamental principle in Higher Chemistry Unit 3.
Definition: At equilibrium, the forward and backward reactions are continuing, and their rates are equal, resulting in constant concentrations of reactants and products.
The page covers key aspects of equilibrium:
Highlight: Catalysts increase the rate of both forward and backward reactions but do not affect the position of equilibrium.
Example: Temperature changes can shift the equilibrium position. For endothermic reactions, increasing temperature shifts the equilibrium towards the products, while for exothermic reactions, it shifts towards the reactants.
Understanding chemical equilibrium is essential for predicting and controlling chemical reactions in various applications of Higher Chemistry.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page focuses on excess reactant calculations in chemical reactions. It explains how to determine which reactant is in excess and which is limiting.
Definition: Excess reactant is the substance that remains after a chemical reaction is complete, while the limiting reactant is completely consumed.
The page provides two detailed examples:
Example: In the reaction of 5g zinc with 120cm³ of 0.5M copper(II) sulfate solution, zinc is the limiting reactant with 0.076 moles, while copper(II) sulfate is in excess with 0.06 moles.
These examples demonstrate how to calculate moles using mass and molar mass (n = m ÷ gfm) for solid reactants, and concentration and volume (n = c × v) for solutions.
Highlight: Understanding excess calculations is crucial for predicting reaction outcomes and maximizing efficiency in chemical processes.
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.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
App Store
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