Polarnost je super pomembna tema, ker razloži, zakaj se nekatere... Show more
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Updated Apr 10, 2026
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Polarnost in lastnosti molekul
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Uvod v polarnost
Predstavljaj si polarnost kot neravnovesje v molekuli - nekateri deli so bolj "električni" kot drugi. Polarnost nastane, ko se elektroni v molekuli ne porazdelijo enakomerno, ampak se zbirajo bolj pri enem atomu.
Elektronegativnost je ključna - to je mera, kako močno atom privlači elektrone k sebi. Fluor je najbolj požrešen za elektrone, medtem ko so kovine manj zahtevne.
Poznamo tri vrste vezi: nepolarno kovalentno (elektroni enakomerno razdeljeni), polarno kovalentno (elektroni bolj pri enem atomu) in ionsko (elektron popolnoma preide k drugemu atomu).
Pametno: Zapomni si, da dipolni moment kaže od pozitivnega proti negativnemu delu molekule - kot kompasova igla!
Določanje polarnosti vezi
Polarnost vezi določiš z razliko v elektronegativnosti (Δχ) med atomoma. To je kot tehtanje - močnejši atom "potegne" elektrone k sebi.
Če je Δχ manjši od 0,4, so elektroni enakomerno porazdeljeni (nepolarna vez). Primer: H-H ali C-H vezi.
Če je Δχ med 0,4 in 1,7, nastane polarna vez z delnimi naboji δ+ in δ-. Primer: H-O ali H-Cl vezi.
Če je Δχ večji od 1,7, nastane ionska vez, ker močnejši atom popolnoma "ukrade" elektron. Primer: Na-Cl.
Tip za test: Te mejne vrednosti so samo orientacijske - v naravi ni ostrih meja med tipi vezi!
Določanje polarnosti molekul
Pozor - tudi če ima molekula polarne vezi, še ni nujno, da je molekula polarna! Odločilna je geometrija molekule.
Postopek je preprost: narišeš Lewisovo strukturo, določiš obliko z VSEPR teorijo, nato pa preveriš, ali se dipolni momenti izničijo ali ne.
Simetrične molekule so običajno nepolarne, ker se dipoli medsebojno izničijo - kot pri vlečenju vrvi, kjer obe ekipi vlečeta z enako silo. Primer: CO₂ je linearna in nepolarna.
Asimetrične molekule so polarne, ker dipoli ne morejo biti uravnoteženi. Nevezni elektronski pari skoraj vedno porušijo simetrijo!
Ključno: Ne pozabi - molekula z polarnimi vezmi lahko ostane nepolarna, če je dovolj simetrična!
Praktični primeri
Ogljikov dioksid (CO₂) je odličen primer pasti. Ima polarne C=O vezi, vendar je linearna molekula - dipola se izničita. Rezultat: nepolarna molekula.
Voda (H₂O) je kotna zaradi dveh neveznih parov na kisiku. Dipola O-H vezi se ne izničita, ampak se seštejeta. Rezultat: zelo polarna molekula.
Amonijak (NH₃) ima trigonalno piramidalno obliko. Vsi trije N-H dipoli kažejo proti neveznemu paru in se seštejejo. Rezultat: polarna molekula.
Zapomni si vzorec: linearne, trigonalno planarne in tetraedrične molekule (z enakimi zunanjimi atomi) so običajno nepolarne, kotne in piramidalne pa polarne.
Super nasvet: Če vidiš nevezni par na osrednjem atomu, bo molekula skoraj zagotovo polarna!
Posledice polarnosti
Najbolj znano pravilo je "podobno se topi v podobnem". Polarne snovi (sol, sladkor) se topijo v polarnih topilih (voda), nepolarne (olje, maščobe) pa v nepolarnih (bencin).
Zato se olje in voda ne mešata - polarna voda in nepolarne maščobe se "ne razumejo". Milo deluje, ker ima polaren in nepolaren del.
Ogljikovodiki (metan, etan) so vedno nepolarni, ker so simetrični in so C-H vezi komaj polarne.
Polarnost vpliva tudi na vrelišča, tališča in druge lastnosti - polarne molekule se med seboj močneje privlačijo.
Za življenje: Razumevanje polarnosti ti pomaga razložiti, zakaj detergenti delujejo in zakaj nekatere snovi ne moreš zmešati!
Hitri povzetek za teste
Za polarnost vezi: Preveri Δχ. Manjši od 0,4 = nepolarna, 0,4-1,7 = polarna, večji od 1,7 = ionska.
Za polarnost molekule: Lewisova struktura → VSEPR geometrija → polarnost vezi → seštevanje vektorjev (pozor na simetrijo!).
Simetrične oblike z enakimi zunanjimi atomi = nepolarne (CO₂, CH₄, CCl₄). Asimetrične oblike = polarne (H₂O, NH₃, HCl).
Praktična uporaba: Polarne snovi se mešajo s polarnimi, nepolarne z nepolarnimi. Nevezni pari skoraj vedno naredijo molekulo polarno.
Zadnji nasvet: Pri testih najprej preveri simetrijo - če je molekula popolnoma simetrična z enakimi atomi, je skoraj zagotovo nepolarna!
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Basil
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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
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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
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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.
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
Polarnost in lastnosti molekul
Polarnost je super pomembna tema, ker razloži, zakaj se nekatere snovi mešajo (kot sol in voda), druge pa ne (kot olje in voda). Gre za to, kako so elektroni porazdeljeni v molekulah - ali so enakomerno ali pa se "zbirajo"... Show more
Uvod v polarnost
Predstavljaj si polarnost kot neravnovesje v molekuli - nekateri deli so bolj "električni" kot drugi. Polarnost nastane, ko se elektroni v molekuli ne porazdelijo enakomerno, ampak se zbirajo bolj pri enem atomu.
Elektronegativnost je ključna - to je mera, kako močno atom privlači elektrone k sebi. Fluor je najbolj požrešen za elektrone, medtem ko so kovine manj zahtevne.
Poznamo tri vrste vezi: nepolarno kovalentno (elektroni enakomerno razdeljeni), polarno kovalentno (elektroni bolj pri enem atomu) in ionsko (elektron popolnoma preide k drugemu atomu).
Pametno: Zapomni si, da dipolni moment kaže od pozitivnega proti negativnemu delu molekule - kot kompasova igla!
Sign up to see the contentIt's free!
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Določanje polarnosti vezi
Polarnost vezi določiš z razliko v elektronegativnosti (Δχ) med atomoma. To je kot tehtanje - močnejši atom "potegne" elektrone k sebi.
Če je Δχ manjši od 0,4, so elektroni enakomerno porazdeljeni (nepolarna vez). Primer: H-H ali C-H vezi.
Če je Δχ med 0,4 in 1,7, nastane polarna vez z delnimi naboji δ+ in δ-. Primer: H-O ali H-Cl vezi.
Če je Δχ večji od 1,7, nastane ionska vez, ker močnejši atom popolnoma "ukrade" elektron. Primer: Na-Cl.
Tip za test: Te mejne vrednosti so samo orientacijske - v naravi ni ostrih meja med tipi vezi!
Sign up to see the contentIt's free!
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Določanje polarnosti molekul
Pozor - tudi če ima molekula polarne vezi, še ni nujno, da je molekula polarna! Odločilna je geometrija molekule.
Postopek je preprost: narišeš Lewisovo strukturo, določiš obliko z VSEPR teorijo, nato pa preveriš, ali se dipolni momenti izničijo ali ne.
Simetrične molekule so običajno nepolarne, ker se dipoli medsebojno izničijo - kot pri vlečenju vrvi, kjer obe ekipi vlečeta z enako silo. Primer: CO₂ je linearna in nepolarna.
Asimetrične molekule so polarne, ker dipoli ne morejo biti uravnoteženi. Nevezni elektronski pari skoraj vedno porušijo simetrijo!
Ključno: Ne pozabi - molekula z polarnimi vezmi lahko ostane nepolarna, če je dovolj simetrična!
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Praktični primeri
Ogljikov dioksid (CO₂) je odličen primer pasti. Ima polarne C=O vezi, vendar je linearna molekula - dipola se izničita. Rezultat: nepolarna molekula.
Voda (H₂O) je kotna zaradi dveh neveznih parov na kisiku. Dipola O-H vezi se ne izničita, ampak se seštejeta. Rezultat: zelo polarna molekula.
Amonijak (NH₃) ima trigonalno piramidalno obliko. Vsi trije N-H dipoli kažejo proti neveznemu paru in se seštejejo. Rezultat: polarna molekula.
Zapomni si vzorec: linearne, trigonalno planarne in tetraedrične molekule (z enakimi zunanjimi atomi) so običajno nepolarne, kotne in piramidalne pa polarne.
Super nasvet: Če vidiš nevezni par na osrednjem atomu, bo molekula skoraj zagotovo polarna!
Sign up to see the contentIt's free!
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Posledice polarnosti
Najbolj znano pravilo je "podobno se topi v podobnem". Polarne snovi (sol, sladkor) se topijo v polarnih topilih (voda), nepolarne (olje, maščobe) pa v nepolarnih (bencin).
Zato se olje in voda ne mešata - polarna voda in nepolarne maščobe se "ne razumejo". Milo deluje, ker ima polaren in nepolaren del.
Ogljikovodiki (metan, etan) so vedno nepolarni, ker so simetrični in so C-H vezi komaj polarne.
Polarnost vpliva tudi na vrelišča, tališča in druge lastnosti - polarne molekule se med seboj močneje privlačijo.
Za življenje: Razumevanje polarnosti ti pomaga razložiti, zakaj detergenti delujejo in zakaj nekatere snovi ne moreš zmešati!
Sign up to see the contentIt's free!
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Hitri povzetek za teste
Za polarnost vezi: Preveri Δχ. Manjši od 0,4 = nepolarna, 0,4-1,7 = polarna, večji od 1,7 = ionska.
Za polarnost molekule: Lewisova struktura → VSEPR geometrija → polarnost vezi → seštevanje vektorjev (pozor na simetrijo!).
Simetrične oblike z enakimi zunanjimi atomi = nepolarne (CO₂, CH₄, CCl₄). Asimetrične oblike = polarne (H₂O, NH₃, HCl).
Praktična uporaba: Polarne snovi se mešajo s polarnimi, nepolarne z nepolarnimi. Nevezni pari skoraj vedno naredijo molekulo polarno.
Zadnji nasvet: Pri testih najprej preveri simetrijo - če je molekula popolnoma simetrična z enakimi atomi, je skoraj zagotovo nepolarna!
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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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