Hemijske jednačine su "jezik" hemije - oni ti omogućavaju da... Show more
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Updated May 12, 2026
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Kako Pisati i Balansirati Hemijske Jednačine
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Šta su hemijske jednačine i zašto su bitne
Zamišljaj hemijsku jednačinu kao "recept" za reakciju. Umesto da kažeš "vodonik reaguje sa kiseonikom i pravi vodu", jednostavno napišeš simbole i odmah vidiš celinu.
Hemijska jednačina je skraćeni način da prikažeš hemijsku reakciju pomoću simbola i formula. Reaktanti su supstance koje "ulaze" u reakciju (pišu se levo od strelice), dok su proizvodi ono što "izlazi" (pišu se desno). Strelica (→) znači "daje" ili "nastaje".
Zakon o održanju mase je osnova svega - atomi se ne gube ni stvaraju tokom reakcije, samo se pregrupisavaju. Zato broj atoma svakog elementa mora biti jednak sa obe strane jednačine. Stehiometrijski koeficijenti su brojevi ispred formula koji ti govore u kom odnosu supstance reaguju.
Pažnja! Indeksi (mali brojevi u formulama kao što je 2 u H₂O) se NIKAD ne menjaju - oni određuju identitet supstance!
Kako da izjednačiš hemijsku jednačinu - korak po korak
Izjednačavanje nije komplikovano ako pratiš sistem. Počni sa "kosturom" jednačine - napiši tačne hemijske formule svih supstanca (bez koeficijenata).
Za primer H₂ + O₂ → H₂O, napravi tabelu i prebroj atome sa obe strane. Vodonik ima 2 atoma levo i 2 desno (OK), ali kiseonik ima 2 levo i 1 desno (problem!).
Da rešiš ovo, stavi koeficijent 2 ispred H₂O: H₂ + O₂ → 2H₂O. Sada imaš 2 atoma kiseonika sa obe strane, ali 2 vodonika levo i 4 desno. Stavi koeficijent 2 ispred H₂ i dobijaš: 2H₂ + O₂ → 2H₂O.
Zapamti dvoatomske elemente: H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂ - oni uvek "idu u paru"!
Rešavanje složenijih jednačina
Za kompleksnije reakcije kao što je sagorevanje metana, pristup je isti. CH₄ + O₂ → CO₂ + H₂O - ovde imaš ugljenik, vodonik i kiseonik da balansiram.
Počni sa ugljenikom . Zatim vodonik: imaš 4 levo, a 2 desno, pa stavi 2 ispred H₂O. Sada računaj kiseonik: levo 2, desno 2 + 2 = 4. Stavi 2 ispred O₂.
Finalna jednačina: CH₄ + 2O₂ → CO₂ + 2H₂O. Uvek proveri na kraju - prebroj sve atome još jednom da budeš siguran.
Kada imaš neparne i parne brojeve (kao 3 i 2), koristi najmanji zajednički sadržalac. Za aluminijum i hlorovodonične kiseline: 2Al + 6HCl → 2AlCl₃ + 3H₂.
Savět za ispit: Redosled izjednačavanja - metali, nemetali, vodonik, kiseonik na kraju!
Praktični saveti za kontrolni
Postoji nekoliko trikova koji će ti značajno olakšati život na testu. Elementarne supstance (čisti elementi kao Fe, O₂, N₂) ostavi za kraj - lako ih je "namestiti" jer ne utiču na druge elemente.
Ako vidiš poliatomske jone (SO₄²⁻, NO₃⁻) koji se pojavljuju nepromenoni sa obe strane, tretiraju ih kao celinu umesto da brojiš svaki atom posebno. To drastično skraćuje posao.
Zlatno pravilo broj 1: Ne menjaj indekse u formulama! H₂O nikad ne postaje H₂O₂ - to su potpuno različite supstance. Menjaju se samo koeficijenti ispred celih formula.
Zlatno pravilo broj 2: Konačni koeficijenti moraju biti najmanji mogući celi brojevi. Ako dobiješ 4H₂ + 2O₂ → 4H₂O, podeli sve sa 2.
Finalna provera je obavezna! Napravi tabelu i prebroj sve atome još jednom - greške u hemiji mogu biti skupe na testu!
We thought you’d never ask...
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You can download the app from Google Play Store and Apple App Store.
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Students love us — and so will you.
4.6/5
App Store
4.7/5
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 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
Kako Pisati i Balansirati Hemijske Jednačine
Hemijske jednačine su "jezik" hemije - oni ti omogućavaju da razumeš šta se tačno dešava tokom reakcija. Umesto da opisuješ rečima, samo zapišeš simbole i brojke da vidiš koje supstance reaguju i šta nastaje.
Šta su hemijske jednačine i zašto su bitne
Zamišljaj hemijsku jednačinu kao "recept" za reakciju. Umesto da kažeš "vodonik reaguje sa kiseonikom i pravi vodu", jednostavno napišeš simbole i odmah vidiš celinu.
Hemijska jednačina je skraćeni način da prikažeš hemijsku reakciju pomoću simbola i formula. Reaktanti su supstance koje "ulaze" u reakciju (pišu se levo od strelice), dok su proizvodi ono što "izlazi" (pišu se desno). Strelica (→) znači "daje" ili "nastaje".
Zakon o održanju mase je osnova svega - atomi se ne gube ni stvaraju tokom reakcije, samo se pregrupisavaju. Zato broj atoma svakog elementa mora biti jednak sa obe strane jednačine. Stehiometrijski koeficijenti su brojevi ispred formula koji ti govore u kom odnosu supstance reaguju.
Pažnja! Indeksi (mali brojevi u formulama kao što je 2 u H₂O) se NIKAD ne menjaju - oni određuju identitet supstance!
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Kako da izjednačiš hemijsku jednačinu - korak po korak
Izjednačavanje nije komplikovano ako pratiš sistem. Počni sa "kosturom" jednačine - napiši tačne hemijske formule svih supstanca (bez koeficijenata).
Za primer H₂ + O₂ → H₂O, napravi tabelu i prebroj atome sa obe strane. Vodonik ima 2 atoma levo i 2 desno (OK), ali kiseonik ima 2 levo i 1 desno (problem!).
Da rešiš ovo, stavi koeficijent 2 ispred H₂O: H₂ + O₂ → 2H₂O. Sada imaš 2 atoma kiseonika sa obe strane, ali 2 vodonika levo i 4 desno. Stavi koeficijent 2 ispred H₂ i dobijaš: 2H₂ + O₂ → 2H₂O.
Zapamti dvoatomske elemente: H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂ - oni uvek "idu u paru"!
Sign up to see the contentIt's free!
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Rešavanje složenijih jednačina
Za kompleksnije reakcije kao što je sagorevanje metana, pristup je isti. CH₄ + O₂ → CO₂ + H₂O - ovde imaš ugljenik, vodonik i kiseonik da balansiram.
Počni sa ugljenikom . Zatim vodonik: imaš 4 levo, a 2 desno, pa stavi 2 ispred H₂O. Sada računaj kiseonik: levo 2, desno 2 + 2 = 4. Stavi 2 ispred O₂.
Finalna jednačina: CH₄ + 2O₂ → CO₂ + 2H₂O. Uvek proveri na kraju - prebroj sve atome još jednom da budeš siguran.
Kada imaš neparne i parne brojeve (kao 3 i 2), koristi najmanji zajednički sadržalac. Za aluminijum i hlorovodonične kiseline: 2Al + 6HCl → 2AlCl₃ + 3H₂.
Savět za ispit: Redosled izjednačavanja - metali, nemetali, vodonik, kiseonik na kraju!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Praktični saveti za kontrolni
Postoji nekoliko trikova koji će ti značajno olakšati život na testu. Elementarne supstance (čisti elementi kao Fe, O₂, N₂) ostavi za kraj - lako ih je "namestiti" jer ne utiču na druge elemente.
Ako vidiš poliatomske jone (SO₄²⁻, NO₃⁻) koji se pojavljuju nepromenoni sa obe strane, tretiraju ih kao celinu umesto da brojiš svaki atom posebno. To drastično skraćuje posao.
Zlatno pravilo broj 1: Ne menjaj indekse u formulama! H₂O nikad ne postaje H₂O₂ - to su potpuno različite supstance. Menjaju se samo koeficijenti ispred celih formula.
Zlatno pravilo broj 2: Konačni koeficijenti moraju biti najmanji mogući celi brojevi. Ako dobiješ 4H₂ + 2O₂ → 4H₂O, podeli sve sa 2.
Finalna provera je obavezna! Napravi tabelu i prebroj sve atome još jednom - greške u hemiji mogu biti skupe na testu!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
We thought you’d never ask...
What is the Knowunity AI companion?
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.
Where can I download the Knowunity app?
You can download the app from Google Play Store and 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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Most popular content in Hemija
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Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
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 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