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30 Nov 2025
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OCR A-Level Chemistry Module 3 Overview
Alina Ijaz
@a1ina786
1 / 5
Periodicity and Ionisation Energy
Periodicity is just the repeating patterns you see when elements are arranged in the periodic table - it's like nature's own organised filing system! The most important pattern to master is ionisation energy, which is the energy needed to remove an electron from an atom.
Here's what drives these patterns: nuclear charge (number of protons) pulls electrons in tighter, whilst shielding from inner electrons pushes outer ones away. As you go across a period, nuclear charge increases faster than shielding, so ionisation energy generally increases. Down a group, extra electron shells create more shielding, making it easier to remove outer electrons.
Watch out for the sneaky exceptions! Group 3 elements have lower ionisation energy than Group 2 because you're removing from a higher-energy p orbital instead of an s orbital. Group 6 has lower ionisation energy than Group 5 because paired electrons in p orbitals repel each other, making removal easier.
Quick tip: Remember "nuclear charge wins across, shielding wins down" - this explains most periodic trends!
Group 2 elements become more reactive down the group. Their hydroxides get more soluble and more alkaline as you go from magnesium to barium. You'll see Ca(OH)₂ used in agriculture to neutralise acidic soils, and Mg(OH)₂ in antacids to neutralise stomach acid.
Group 7 Halogens and Chemical Tests
Group 7 halogens are the reactive non-metals that get less reactive as you go down the group - the opposite of Group 2! They exist as diatomic molecules (F₂, Cl₂, etc.) with increasing boiling points down the group due to stronger intermolecular forces.
The key rule for halogen reactions is simple: more reactive halogens displace less reactive halides. Chlorine will kick out bromine and iodine from their compounds, bromine will displace iodine, but iodine can't displace anything. You can spot these reactions by colour changes - chlorine water is pale green, bromine is orange, and iodine is brown.
Disproportionation happens when chlorine reacts with cold dilute alkali - the same element gets both oxidised and reduced simultaneously. It's like chlorine having an identity crisis, becoming both chloride and chlorate ions!
Test prep alert: Learn the colour changes for halogen displacement reactions - they're exam favourites!
Qualitative analysis lets you identify mystery ions. For carbonates, add nitric acid and bubble the gas through limewater (white precipitate confirms CO₃²⁻). For sulfates, add barium nitrate to get a white precipitate. For halides, use silver nitrate followed by ammonia - chloride gives white precipitate that dissolves in dilute ammonia, bromide gives cream that only dissolves in concentrated ammonia, and iodide gives yellow that won't dissolve at all.
Enthalpy and Energy Changes
Enthalpy (ΔH) measures heat energy changes during reactions at constant pressure. Think of it as the energy bank account of reactions - exothermic reactions release energy (ΔH negative, like spending money), whilst endothermic reactions absorb energy (ΔH positive, like earning money).
You need to know the standard definitions inside out. Standard enthalpy of formation is energy change when 1 mole of compound forms from its elements. Standard enthalpy of combustion is energy change when 1 mole burns completely in oxygen. Standard enthalpy of neutralisation is energy change when 1 mole of water forms from acid-base reaction.
Standard conditions are your reference point: 298K temperature, 100 kPa pressure, and 1 mol dm⁻³ concentration. These ensure everyone's measuring on the same scale.
Calculation hack: Always check if temperature goes up (exothermic, ΔH negative) or down (endothermic, ΔH positive) in calorimetry!
Average bond enthalpy is the energy needed to break one mole of a specific bond in gaseous molecules. Remember it's an average because the same bond can have slightly different strengths in different molecules.
Enthalpy Calculations and Reaction Rates
For calorimetry calculations, follow the magic formula: q = mcΔT, where q is heat energy, m is mass, c is specific heat capacity (4.18 J g⁻¹ K⁻¹ for water), and ΔT is temperature change. Then convert to enthalpy per mole by dividing by the number of moles.
Your calculated values might not match data book values due to heat loss to surroundings, incomplete combustion, or non-standard conditions. Real experiments are messy - that's normal!
Hess's Law is your problem-solving superhero when you can't measure enthalpy changes directly. Use formation enthalpies going up and combustion enthalpies going down in your cycles. Remember: sum of reactants minus sum of products.
Exam success: Master the step-by-step calculation method - it'll save you marks even if your final answer is wrong!
Reaction rates depend on successful collisions between particles. Higher concentration or pressure means more particles per unit volume, leading to more frequent collisions. Higher temperature gives more particles enough energy to overcome the activation energy barrier. Catalysts provide alternative pathways with lower activation energy, making reactions faster and more economical.
Chemical Equilibrium
Dynamic equilibrium occurs when forward and reverse reaction rates become equal - it's like a busy roundabout where cars enter and leave at the same rate. Concentrations stay constant, but individual molecules keep reacting both ways.
Homogeneous equilibrium has all species in the same phase (like gases), whilst heterogeneous equilibrium involves different phases (like solid and gas). The equilibrium constant Kc tells you which way the equilibrium lies - Kc > 1 means products are favoured, Kc < 1 means reactants win.
Le Chatelier's Principle predicts how equilibrium shifts when you disturb it. The system always tries to oppose your change. Increase pressure? Equilibrium shifts to the side with fewer gas molecules. Increase temperature? Equilibrium shifts to absorb that extra heat (favouring the endothermic direction).
Memory trick: Think of equilibrium as a stubborn teenager - whatever you try to do, it does the opposite!
For industrial applications, you'll often see compromises between yield and rate. High pressure favours ammonia production but costs more. Moderate temperature gives reasonable rate and yield. Catalysts are game-changers - they speed up reactions without affecting equilibrium position, reducing energy costs and environmental impact.
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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.
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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 😍😁😲🤑💗✨🎀😮
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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
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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
OCR A-Level Chemistry Module 3 Overview
Alina Ijaz
@a1ina786
You're diving into the core chemistry concepts that tie everything together - from how elements behave in patterns to why reactions happen the way they do. This module covers periodicity, Group 2 and 7 elements, enthalpy changes, reaction rates, and... Show more
Periodicity and Ionisation Energy
Periodicity is just the repeating patterns you see when elements are arranged in the periodic table - it's like nature's own organised filing system! The most important pattern to master is ionisation energy, which is the energy needed to remove an electron from an atom.
Here's what drives these patterns: nuclear charge (number of protons) pulls electrons in tighter, whilst shielding from inner electrons pushes outer ones away. As you go across a period, nuclear charge increases faster than shielding, so ionisation energy generally increases. Down a group, extra electron shells create more shielding, making it easier to remove outer electrons.
Watch out for the sneaky exceptions! Group 3 elements have lower ionisation energy than Group 2 because you're removing from a higher-energy p orbital instead of an s orbital. Group 6 has lower ionisation energy than Group 5 because paired electrons in p orbitals repel each other, making removal easier.
Quick tip: Remember "nuclear charge wins across, shielding wins down" - this explains most periodic trends!
Group 2 elements become more reactive down the group. Their hydroxides get more soluble and more alkaline as you go from magnesium to barium. You'll see Ca(OH)₂ used in agriculture to neutralise acidic soils, and Mg(OH)₂ in antacids to neutralise stomach acid.
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Group 7 Halogens and Chemical Tests
Group 7 halogens are the reactive non-metals that get less reactive as you go down the group - the opposite of Group 2! They exist as diatomic molecules (F₂, Cl₂, etc.) with increasing boiling points down the group due to stronger intermolecular forces.
The key rule for halogen reactions is simple: more reactive halogens displace less reactive halides. Chlorine will kick out bromine and iodine from their compounds, bromine will displace iodine, but iodine can't displace anything. You can spot these reactions by colour changes - chlorine water is pale green, bromine is orange, and iodine is brown.
Disproportionation happens when chlorine reacts with cold dilute alkali - the same element gets both oxidised and reduced simultaneously. It's like chlorine having an identity crisis, becoming both chloride and chlorate ions!
Test prep alert: Learn the colour changes for halogen displacement reactions - they're exam favourites!
Qualitative analysis lets you identify mystery ions. For carbonates, add nitric acid and bubble the gas through limewater (white precipitate confirms CO₃²⁻). For sulfates, add barium nitrate to get a white precipitate. For halides, use silver nitrate followed by ammonia - chloride gives white precipitate that dissolves in dilute ammonia, bromide gives cream that only dissolves in concentrated ammonia, and iodide gives yellow that won't dissolve at all.
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Enthalpy and Energy Changes
Enthalpy (ΔH) measures heat energy changes during reactions at constant pressure. Think of it as the energy bank account of reactions - exothermic reactions release energy (ΔH negative, like spending money), whilst endothermic reactions absorb energy (ΔH positive, like earning money).
You need to know the standard definitions inside out. Standard enthalpy of formation is energy change when 1 mole of compound forms from its elements. Standard enthalpy of combustion is energy change when 1 mole burns completely in oxygen. Standard enthalpy of neutralisation is energy change when 1 mole of water forms from acid-base reaction.
Standard conditions are your reference point: 298K temperature, 100 kPa pressure, and 1 mol dm⁻³ concentration. These ensure everyone's measuring on the same scale.
Calculation hack: Always check if temperature goes up (exothermic, ΔH negative) or down (endothermic, ΔH positive) in calorimetry!
Average bond enthalpy is the energy needed to break one mole of a specific bond in gaseous molecules. Remember it's an average because the same bond can have slightly different strengths in different molecules.
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Enthalpy Calculations and Reaction Rates
For calorimetry calculations, follow the magic formula: q = mcΔT, where q is heat energy, m is mass, c is specific heat capacity (4.18 J g⁻¹ K⁻¹ for water), and ΔT is temperature change. Then convert to enthalpy per mole by dividing by the number of moles.
Your calculated values might not match data book values due to heat loss to surroundings, incomplete combustion, or non-standard conditions. Real experiments are messy - that's normal!
Hess's Law is your problem-solving superhero when you can't measure enthalpy changes directly. Use formation enthalpies going up and combustion enthalpies going down in your cycles. Remember: sum of reactants minus sum of products.
Exam success: Master the step-by-step calculation method - it'll save you marks even if your final answer is wrong!
Reaction rates depend on successful collisions between particles. Higher concentration or pressure means more particles per unit volume, leading to more frequent collisions. Higher temperature gives more particles enough energy to overcome the activation energy barrier. Catalysts provide alternative pathways with lower activation energy, making reactions faster and more economical.
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Chemical Equilibrium
Dynamic equilibrium occurs when forward and reverse reaction rates become equal - it's like a busy roundabout where cars enter and leave at the same rate. Concentrations stay constant, but individual molecules keep reacting both ways.
Homogeneous equilibrium has all species in the same phase (like gases), whilst heterogeneous equilibrium involves different phases (like solid and gas). The equilibrium constant Kc tells you which way the equilibrium lies - Kc > 1 means products are favoured, Kc < 1 means reactants win.
Le Chatelier's Principle predicts how equilibrium shifts when you disturb it. The system always tries to oppose your change. Increase pressure? Equilibrium shifts to the side with fewer gas molecules. Increase temperature? Equilibrium shifts to absorb that extra heat (favouring the endothermic direction).
Memory trick: Think of equilibrium as a stubborn teenager - whatever you try to do, it does the opposite!
For industrial applications, you'll often see compromises between yield and rate. High pressure favours ammonia production but costs more. Moderate temperature gives reasonable rate and yield. Catalysts are game-changers - they speed up reactions without affecting equilibrium position, reducing energy costs and environmental impact.
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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