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Jasy Rodriguez
12/12/2025
Chemistry
Chemistry Scientists and their Contributions
52
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Dec 12, 2025
•
Famous Chemists and Their Key Discoveries
Jasy Rodriguez
@jasyrodriguez_fpij
1 / 4
Early Chemistry Pioneers
Ever wonder why matter doesn't disappear during chemical reactions? Thank Antoine Lavoisier and his Law of Conservation of Mass, which established that mass is neither created nor destroyed during chemical reactions—it just changes form.
Dmitri Mendeleev revolutionized chemistry by creating the first modern Periodic Table of Elements, organizing elements by their properties and even predicting the existence of elements not yet discovered. John Dalton gave us the foundation of modern chemistry with his Atomic Theory, proposing that all elements consist of tiny, indivisible particles called atoms that combine to form compounds.
The structure of the atom gradually came into focus through multiple scientists' work. J.J. Thomson discovered electrons and proposed the Plum Pudding Model with electrons embedded in a positive cloud. Ernest Rutherford's famous Gold Foil Experiment led to the Nuclear Model, revealing that atoms have a dense, positively-charged nucleus with electrons orbiting around it.
Science in Action: When Mendeleev created his periodic table, he confidently left gaps for undiscovered elements and accurately predicted their properties. Years later, elements like gallium were discovered that perfectly matched his predictions!
Neil Bohr refined our understanding with his Bohr Atomic Model, showing electrons orbit in specific energy levels. Einstein's work on the Photoelectric Effect demonstrated light's dual nature as both waves and particles, leading to his famous equation E = mc² that shows the relationship between energy and mass.
Quantum Theory and Atomic Structure
Did you know electrons behave like both particles and waves? Louis de Broglie blew minds with his de Broglie Wavelength equation, showing that particles can have wave properties—an idea that later became crucial for developing electron microscopes you might use in science lab.
Several scientists contributed to our understanding of how electrons behave in atoms. Wolfgang Pauli formulated the Pauli Exclusion Principle, which states no two electrons in an atom can have identical quantum states. Friedrich Hund's Hund's Rule explains that electrons arrange themselves to maximize unpaired electrons in orbitals of equal energy.
Linus Pauling made chemistry more visual by developing Lewis Dot Structures and exploring the nature of chemical bonds. He introduced the concept of orbital hybridization, explaining how atoms share electrons, and created the Electronegativity Scale that helps predict bond types.
Mind-Blowing Fact: Heisenberg's Uncertainty Principle means you can never know both exactly where an electron is and how fast it's moving—it's not just difficult to measure; it's physically impossible!
The behavior of gases was another major area of study. Avogadro discovered that equal volumes of gases at the same temperature and pressure contain the same number of molecules. His work led to the concept of the mole and Avogadro's Number (6.02 × 10²³), which you'll use constantly in chemistry calculations.
Thermodynamics and Equilibrium
Temperature, pressure, and energy are connected in ways that affect every chemical reaction. The Ideal Gas Law developed by Clapeyron relates these properties for gases, while van der Waals improved this with equations that account for real gases by considering molecule size and attractions.
Understanding solutions got easier with Henry's and Raoult's Laws. Henry's Law shows how gas dissolves in liquids under pressure (think carbonated drinks!), while Raoult's Law helps predict vapor pressure of mixed liquids. Jacobus van't Hoff developed equations relating temperature to equilibrium constants and explained how dissolved substances affect freezing and boiling points.
Gibbs revolutionized chemistry with the concept of Gibbs Free Energy , which combines enthalpy (energy) and entropy (disorder) to predict whether reactions will happen spontaneously. When ΔG is negative, the reaction will proceed without outside help!
Chemistry Hack: Remember that Gibbs Free Energy (ΔG) is like nature's scorecard—negative values mean "GO!" for reactions, while positive values mean "STOP!" This single concept explains why some reactions happen and others don't.
Hess's Law tells us that energy changes are additive, allowing us to calculate energy changes for complex reactions by breaking them into simpler steps. This is super useful when direct measurements are difficult or dangerous to perform in the lab.
Reaction Rates, Acids/Bases, and Electrochemistry
Ever wondered why reactions speed up when heated? Svante Arrhenius explained this with his Arrhenius Equation, showing how temperature affects reaction rates by giving molecules the energy they need to overcome the activation energy barrier.
When reactions reach equilibrium, Le Châtelier's Principle helps predict how the system responds to changes. Add more reactants? The reaction shifts right. Increase pressure? The reaction favors the side with fewer gas molecules. This principle is crucial in industrial processes like the Haber-Bosch process for ammonia production.
Acids and bases were defined in several ways as chemistry advanced. The Brønsted-Lowry theory defines acids as proton donors and bases as proton acceptors, expanding our understanding beyond the earlier Arrhenius theory. For biological systems, the Henderson-Hasselbalch Equation helps calculate pH in buffer solutions, explaining how your blood maintains stable pH despite adding acids or bases.
Real-World Connection: The Haber-Bosch process for making ammonia might sound boring, but it revolutionized agriculture by creating fertilizers that feed billions of people worldwide. Chemistry literally helps feed the planet!
Electrochemistry connects chemical reactions with electrical energy. Galvani and Volta developed the first batteries, while Nernst's Equation helps predict voltage in electrochemical cells when concentrations differ from standard conditions. This foundational work powers everything from your smartphone battery to electric vehicles.
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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.
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I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
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Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
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!
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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.
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I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
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Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
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 app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
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
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
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
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
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 app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Famous Chemists and Their Key Discoveries
Jasy Rodriguez
@jasyrodriguez_fpij
Discover the scientific giants who shaped chemistry as we know it today! From atomic theory to thermodynamics, these brilliant minds established the fundamental principles that explain how our world works at the molecular level. Their experiments and theories form the... Show more
Early Chemistry Pioneers
Ever wonder why matter doesn't disappear during chemical reactions? Thank Antoine Lavoisier and his Law of Conservation of Mass, which established that mass is neither created nor destroyed during chemical reactions—it just changes form.
Dmitri Mendeleev revolutionized chemistry by creating the first modern Periodic Table of Elements, organizing elements by their properties and even predicting the existence of elements not yet discovered. John Dalton gave us the foundation of modern chemistry with his Atomic Theory, proposing that all elements consist of tiny, indivisible particles called atoms that combine to form compounds.
The structure of the atom gradually came into focus through multiple scientists' work. J.J. Thomson discovered electrons and proposed the Plum Pudding Model with electrons embedded in a positive cloud. Ernest Rutherford's famous Gold Foil Experiment led to the Nuclear Model, revealing that atoms have a dense, positively-charged nucleus with electrons orbiting around it.
Science in Action: When Mendeleev created his periodic table, he confidently left gaps for undiscovered elements and accurately predicted their properties. Years later, elements like gallium were discovered that perfectly matched his predictions!
Neil Bohr refined our understanding with his Bohr Atomic Model, showing electrons orbit in specific energy levels. Einstein's work on the Photoelectric Effect demonstrated light's dual nature as both waves and particles, leading to his famous equation E = mc² that shows the relationship between energy and mass.
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Quantum Theory and Atomic Structure
Did you know electrons behave like both particles and waves? Louis de Broglie blew minds with his de Broglie Wavelength equation, showing that particles can have wave properties—an idea that later became crucial for developing electron microscopes you might use in science lab.
Several scientists contributed to our understanding of how electrons behave in atoms. Wolfgang Pauli formulated the Pauli Exclusion Principle, which states no two electrons in an atom can have identical quantum states. Friedrich Hund's Hund's Rule explains that electrons arrange themselves to maximize unpaired electrons in orbitals of equal energy.
Linus Pauling made chemistry more visual by developing Lewis Dot Structures and exploring the nature of chemical bonds. He introduced the concept of orbital hybridization, explaining how atoms share electrons, and created the Electronegativity Scale that helps predict bond types.
Mind-Blowing Fact: Heisenberg's Uncertainty Principle means you can never know both exactly where an electron is and how fast it's moving—it's not just difficult to measure; it's physically impossible!
The behavior of gases was another major area of study. Avogadro discovered that equal volumes of gases at the same temperature and pressure contain the same number of molecules. His work led to the concept of the mole and Avogadro's Number (6.02 × 10²³), which you'll use constantly in chemistry calculations.
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Thermodynamics and Equilibrium
Temperature, pressure, and energy are connected in ways that affect every chemical reaction. The Ideal Gas Law developed by Clapeyron relates these properties for gases, while van der Waals improved this with equations that account for real gases by considering molecule size and attractions.
Understanding solutions got easier with Henry's and Raoult's Laws. Henry's Law shows how gas dissolves in liquids under pressure (think carbonated drinks!), while Raoult's Law helps predict vapor pressure of mixed liquids. Jacobus van't Hoff developed equations relating temperature to equilibrium constants and explained how dissolved substances affect freezing and boiling points.
Gibbs revolutionized chemistry with the concept of Gibbs Free Energy , which combines enthalpy (energy) and entropy (disorder) to predict whether reactions will happen spontaneously. When ΔG is negative, the reaction will proceed without outside help!
Chemistry Hack: Remember that Gibbs Free Energy (ΔG) is like nature's scorecard—negative values mean "GO!" for reactions, while positive values mean "STOP!" This single concept explains why some reactions happen and others don't.
Hess's Law tells us that energy changes are additive, allowing us to calculate energy changes for complex reactions by breaking them into simpler steps. This is super useful when direct measurements are difficult or dangerous to perform in the lab.
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Reaction Rates, Acids/Bases, and Electrochemistry
Ever wondered why reactions speed up when heated? Svante Arrhenius explained this with his Arrhenius Equation, showing how temperature affects reaction rates by giving molecules the energy they need to overcome the activation energy barrier.
When reactions reach equilibrium, Le Châtelier's Principle helps predict how the system responds to changes. Add more reactants? The reaction shifts right. Increase pressure? The reaction favors the side with fewer gas molecules. This principle is crucial in industrial processes like the Haber-Bosch process for ammonia production.
Acids and bases were defined in several ways as chemistry advanced. The Brønsted-Lowry theory defines acids as proton donors and bases as proton acceptors, expanding our understanding beyond the earlier Arrhenius theory. For biological systems, the Henderson-Hasselbalch Equation helps calculate pH in buffer solutions, explaining how your blood maintains stable pH despite adding acids or bases.
Real-World Connection: The Haber-Bosch process for making ammonia might sound boring, but it revolutionized agriculture by creating fertilizers that feed billions of people worldwide. Chemistry literally helps feed the planet!
Electrochemistry connects chemical reactions with electrical energy. Galvani and Volta developed the first batteries, while Nernst's Equation helps predict voltage in electrochemical cells when concentrations differ from standard conditions. This foundational work powers everything from your smartphone battery to electric vehicles.
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.
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4.9/5
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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
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
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
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
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 app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
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
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
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
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
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 app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user