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!
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.
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
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!
Access to all documents
Improve your grades
Join milions of students
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!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
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!
Access to all documents
Improve your grades
Join milions of students
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!
Access to all documents
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Join milions of students
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 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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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
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