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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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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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.
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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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Elisha
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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
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 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 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
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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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 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 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 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 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