Redoxní reakce jsou všude kolem nás - od rezivění železa... Show more
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Updated Apr 17, 2026
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Základní poznámky k redoxním reakcím v chemii
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Základy redoxních reakcí
Představ si redoxní reakce jako chemické "přetahovanou" o kyslík mezi různými látkami. Tyto reakce probíhají neustále - třeba když tvůj bicykl rezne nebo když zapálíš oheň.
Každá redoxní reakce má dvě strany mince. Oxidace znamená, že látka kyslík přijímá - třeba když železo rezne a stává se z něj rezavý oxid železitý. Redukce je opačný proces, kdy látka kyslík odevzdává.
Tip: Zapamatuj si to jednoduše - OxIdace = přIjímání kyslíku, RedUkce = odevzdávání kyslíkU.
Nejdůležitější je, že tyto procesy probíhají vždycky současně - když jedna látka kyslík přijímá, druhá ho musí odevzdat.
Oxidační a redukční činidla
V každé redoxní reakci máš dva hlavní "hráče". Oxidační činidlo je látka, která kyslík rozdává - funguje jako štědrý dárce, ale přitom sama o kyslík přichází (redukuje se).
Redukční činidlo dělá opak - kyslík si od ostatních bere a tím je redukuje, ale samo se přitom oxiduje. Je to trochu jako chemická ironie - redukční činidlo se oxiduje a oxidační činidlo se redukuje!
Zapamatuj si: Oxidační činidlo = dává kyslík a samo se redukuje. Redukční činidlo = bere kyslík a samo se oxiduje.
Bez těchto dvou činidel by redoxní reakce nemohla proběhnout - vždy potřebuješ někoho, kdo kyslík dá, a někoho, kdo ho vezme.
Redoxní řada kovů
Redoxní řada je jako žebříček popularity kovů - ukazuje, který kov má větší "chuť" na kyslík. Čím výš je kov na začátku řady, tím víc se chce spojit s kyslíkem.
Řada začína aktivními kovy jako hořčík a hliník a končí ušlechtilými kovy jako zlato a platina. Aktivní kovy na začátku řady jsou skvělá redukční činidla - rádi berou kyslík od kovů, které jsou za nimi.
Základní pravidlo je jednoduché: kov může redukovat oxidy kovů, které jsou v řadě za ním. Takže hliník klidně "ukradne" kyslík mědi, ale naopak to nejde.
Praktický tip: Hořčík, hliník a zinek jsou silná redukční činidla - umí redukovat skoro všechny ostatní kovové oxidy.
Praktické příklady
Nejlepší způsob, jak pochopit redoxní reakce, je na konkrétním příkladu. Vezmi reakci oxid stříbrný + hliník → stříbro + oxid hlinitý.
Hliník má v redoxní řadě větší chuť na kyslík než stříbro, takže mu ho prostě "ukradne". Hliník se stane redukčním činidlem (oxiduje se) a oxid stříbrný je oxidační činidlo (redukuje se na čisté stříbro).
Ušlechtilé kovy jako platina, zlato a stříbro jsou v řadě na konci, protože mají malou tendenci se s kyslíkem spojovat. Proto jsou tak cenné - nereznou ani se nekazí!
Pro testy si zapamatuj: Oxidace = přijímání kyslíku, redukce = odevzdávání kyslíku. Oxidační činidlo se samo redukuje, redukční činidlo se samo oxiduje.
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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🤍🤍
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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
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
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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
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THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
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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
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Základní poznámky k redoxním reakcím v chemii
Redoxní reakce jsou všude kolem nás - od rezivění železa až po hoření svíčky. Jde o chemické procesy, při kterých si látky vyměňují kyslík, což ti pomůže pochopit spoustu každodenních jevů.
Základy redoxních reakcí
Představ si redoxní reakce jako chemické "přetahovanou" o kyslík mezi různými látkami. Tyto reakce probíhají neustále - třeba když tvůj bicykl rezne nebo když zapálíš oheň.
Každá redoxní reakce má dvě strany mince. Oxidace znamená, že látka kyslík přijímá - třeba když železo rezne a stává se z něj rezavý oxid železitý. Redukce je opačný proces, kdy látka kyslík odevzdává.
Tip: Zapamatuj si to jednoduše - OxIdace = přIjímání kyslíku, RedUkce = odevzdávání kyslíkU.
Nejdůležitější je, že tyto procesy probíhají vždycky současně - když jedna látka kyslík přijímá, druhá ho musí odevzdat.
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Oxidační a redukční činidla
V každé redoxní reakci máš dva hlavní "hráče". Oxidační činidlo je látka, která kyslík rozdává - funguje jako štědrý dárce, ale přitom sama o kyslík přichází (redukuje se).
Redukční činidlo dělá opak - kyslík si od ostatních bere a tím je redukuje, ale samo se přitom oxiduje. Je to trochu jako chemická ironie - redukční činidlo se oxiduje a oxidační činidlo se redukuje!
Zapamatuj si: Oxidační činidlo = dává kyslík a samo se redukuje. Redukční činidlo = bere kyslík a samo se oxiduje.
Bez těchto dvou činidel by redoxní reakce nemohla proběhnout - vždy potřebuješ někoho, kdo kyslík dá, a někoho, kdo ho vezme.
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Redoxní řada kovů
Redoxní řada je jako žebříček popularity kovů - ukazuje, který kov má větší "chuť" na kyslík. Čím výš je kov na začátku řady, tím víc se chce spojit s kyslíkem.
Řada začína aktivními kovy jako hořčík a hliník a končí ušlechtilými kovy jako zlato a platina. Aktivní kovy na začátku řady jsou skvělá redukční činidla - rádi berou kyslík od kovů, které jsou za nimi.
Základní pravidlo je jednoduché: kov může redukovat oxidy kovů, které jsou v řadě za ním. Takže hliník klidně "ukradne" kyslík mědi, ale naopak to nejde.
Praktický tip: Hořčík, hliník a zinek jsou silná redukční činidla - umí redukovat skoro všechny ostatní kovové oxidy.
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Praktické příklady
Nejlepší způsob, jak pochopit redoxní reakce, je na konkrétním příkladu. Vezmi reakci oxid stříbrný + hliník → stříbro + oxid hlinitý.
Hliník má v redoxní řadě větší chuť na kyslík než stříbro, takže mu ho prostě "ukradne". Hliník se stane redukčním činidlem (oxiduje se) a oxid stříbrný je oxidační činidlo (redukuje se na čisté stříbro).
Ušlechtilé kovy jako platina, zlato a stříbro jsou v řadě na konci, protože mají malou tendenci se s kyslíkem spojovat. Proto jsou tak cenné - nereznou ani se nekazí!
Pro testy si zapamatuj: Oxidace = přijímání kyslíku, redukce = odevzdávání kyslíku. Oxidační činidlo se samo redukuje, redukční činidlo se samo oxiduje.
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What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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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 Knowunity AI. 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 Knowunity AI. 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