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Updated Apr 17, 2026
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Ogljikovodiki: Struktura in Lastnosti Alkanov
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Osnove alkanov in ključni pojmi
Alkani so kot lego kocke kemije - enostavni gradniki, ki se povezujejo samo z enojnimi vezmi. Ker imajo med ogljikovimi atomi le enojne kovalentne vezi, jim pravimo nasičeni ogljikovodiki.
Najbolj pomembna stvar za teste? Splošna formula CₙH₂ₙ₊₂. Če veš število ogljikovih atomov (n), lahko hitro izračunaš število vodikovih atomov. Za metan je n=1, torej CH₄. Za etan je n=2, torej C₂H₆.
Alkani tvorijo homologno vrsto - to pomeni, da se vsak naslednji alkan od prejšnjega razlikuje za skupino -CH₂-. Predstavljaj si jih kot družino, kjer je vsak član podoben prejšnjemu, le malo "debelejši".
Izomerija je pa kot ista obleka, obešena na različne načine. Ista molekulska formula, različna struktura - rezultat so popolnoma različne snovi z različnimi lastnostmi.
💡 Nasvet za test: Formulo CₙH₂ₙ₊₂ uporabi za preverjanje, ali si pravilno narisal strukturno formulo!
Prvih 10 alkanov - obvezno znanje
Ti alkani so kot abeceda organske kemije - brez njih ne boš mogel poimenovati nobene druge organske spojine. Njihova imena si moraš zapomniti na pamet, ker so osnova za vse ostalo.
Od metana (CH₄) do dekana (C₁₀H₂₂) sledijo logičnemu vzorcu. Metan ima 1 ogljik, etan 2, propan 3... Vsakič se molekula "podaljša" za eno CH₂ skupino.
Poglej razliko v strukturnih formulah: metan je samo CH₄, etan je CH₃-CH₃, propan CH₃-CH₂-CH₃. Kot bi dodajal perle na vrvico - vedno dodaš CH₂ v sredino.
Pri testih boš moral poznati tako imena kot molekulske formule. Najbolje je, če si jih zapomniš po parih: metan-etan, propan-butan, pentan-heksan...
💡 Pomni: Imena alkanov so osnova za poimenovanje VSEH organskih spojin - zato jih je vredno res dobro znati!
IUPAC poimenovanje razvejanih alkanov
Ko alkani niso več preproste ravne verige, ampak imajo "veje", potrebuješ sistematičen pristop. IUPAC nomenklatura je kot GPS za kemijo - te vodi po pravilni poti do imena.
Prvi korak: najdi najdaljšo neprekinjeno verigo ogljikovih atomov. To ni vedno očitno - včasih se najdaljša veriga vije kot kača! Ta veriga določi osnovno ime .
Drugi korak: oštevilči verigo tako, da imajo stranske skupine najnižje možne številke. Če lahko šteteš z leve ali desne, izberi smer, ki da manjše številke.
Alkilne skupine (stranske skupine) dobiš iz imen alkanov - samo končnico -an zamenja -il. CH₃ je metil, C₂H₅ je etil...
💡 Trik: Vedno najprej išči najdaljšo verigo - to je največja past pri testih!
Pravila za sestavljanje imena
Zadnji korak pri IUPAC poimenovanju je kot sestavljanje pravilnega naslova - vse mora biti na svojem mestu. Začneš s številko C-atoma, dodaš vezaj, nato ime stranske skupine in končaš z imenom osnovne verige.
Če imaš več enakih stranskih skupin, uporabi predpone: di- (dve), tri- (tri), tetra- (štiri). Številke ločuješ z vejicami: 2,3-dimetil.
Pri več različnih stranskih skupinah jih naštej po abecednem redu - etil pride pred metil. Pazi: predpone di-, tri- se ne upoštevajo pri abecedi!
Strukturni izomeri so kot dvojčka z različnimi osebnostmi. C₄H₁₀ je lahko butan (ravna veriga) ali 2-metilpropan (razvejana veriga). Ista formula, drugačna zgradba, različne lastnosti.
💡 Pogosta napaka: Ne pozabi preveriti, ali si res izbral najdaljšo možno verigo - krajša ni vedno bolj očitna!
Reševanje primerov korak za korakom
Pri 2-metilpentanu najprej preštej najdaljšo verigo - 5 ogljikov pomeni pentan. Nato preveri, od kod je bolje šteti: z leve stranska skupina na C2, z desne na C4. Izbereš levo (manjša številka).
Stranska skupina CH₃ je metil, zato dobiš 2-metilpentan. Preprosto, če znaš korake!
Zahtevnejši primer je 3-etil-2,4-dimetilheksan. Tu imaš 6 ogljikov v najdaljši verigi (heksan) in tri stranske skupine. Paziti moraš na abecedni red: etil pride pred metil.
Ključ do uspeha je sistematičnost - vedno sledi istim korakom, ne preskoči nobenega. Tako ne boš naredil napake niti pri najtežjih primerih.
💡 Za test: Narišij si strukturo na papir in oštevilči ogljike - tako lažje vidiš najdaljšo verigo!
Lastnosti alkanov in praktični nasveti
Alkani so nepolarne molekule, kar pomeni, da se ne mešajo z vodo (polarno). Kot olje in voda - "podobno se topi v podobnem" je zlato pravilo.
Vrelišče narašča z dolžino verige. Metan je plin, heksan tekočina, daljši alkani pa trdne snovi. Razlog? Daljše molekule se "lepijo" skupaj z močnejšimi medmolekulskimi silami.
Razvejani alkani imajo nižje vrelišče kot nerazvejani z istim številom ogljikov. Veje preprečujejo tesno "pakiranje" molekul.
Pogeste napake pri testih: napačno izbrana najdaljša veriga, napačna smer štej, pozabljene predpone di-/tri-, napačen abecedni red. Če se ti to dogaja, naredi checklist in ga vsakič preveri!
💡 Gorenje alkanov: CH₄ + 2O₂ → CO₂ + 2H₂O - to je osnova za vse reakcije gorenja!
Povzetek za hitro ponavljanje
Alkani = nasičeni ogljikovodiki (samo enojne vezi), formula CₙH₂ₙ₊₂, končnica vedno -an. Prvih 10 imen moraš znati na pamet - so osnova za vse!
IUPAC poimenovanje v štirih korakih: najdaljša veriga → oštevilčenje → poimenovanje stranskih skupin → sestavljanje imena. Pazi na abecedni red in predpone!
Alkani so nepolarne snovi, vrelišče narašča z dolžino, gorijo z O₂ v CO₂ in H₂O. Izomeri = ista formula, različna struktura.
To je tvoja osnova za organsko kemijo - če obvladaš alkane, boš lahko osvojil tudi alkohole, aldehide in druge spojine. Samo vadi sistematično!
💡 Zadnji nasvet: Naredi si lastne flashcards z imeni in strukturami - ponavljanje je ključ do uspeha!
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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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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
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
Ogljikovodiki: Struktura in Lastnosti Alkanov
Alkani so tvoja prva postaja v svetu organske kemije! To so najosnovnejše organske spojine, zgrajene samo iz ogljika in vodika, ki jih srečuješ vsak dan - od plina za kuhanje do bencina v avtu.
Osnove alkanov in ključni pojmi
Alkani so kot lego kocke kemije - enostavni gradniki, ki se povezujejo samo z enojnimi vezmi. Ker imajo med ogljikovimi atomi le enojne kovalentne vezi, jim pravimo nasičeni ogljikovodiki.
Najbolj pomembna stvar za teste? Splošna formula CₙH₂ₙ₊₂. Če veš število ogljikovih atomov (n), lahko hitro izračunaš število vodikovih atomov. Za metan je n=1, torej CH₄. Za etan je n=2, torej C₂H₆.
Alkani tvorijo homologno vrsto - to pomeni, da se vsak naslednji alkan od prejšnjega razlikuje za skupino -CH₂-. Predstavljaj si jih kot družino, kjer je vsak član podoben prejšnjemu, le malo "debelejši".
Izomerija je pa kot ista obleka, obešena na različne načine. Ista molekulska formula, različna struktura - rezultat so popolnoma različne snovi z različnimi lastnostmi.
💡 Nasvet za test: Formulo CₙH₂ₙ₊₂ uporabi za preverjanje, ali si pravilno narisal strukturno formulo!
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Prvih 10 alkanov - obvezno znanje
Ti alkani so kot abeceda organske kemije - brez njih ne boš mogel poimenovati nobene druge organske spojine. Njihova imena si moraš zapomniti na pamet, ker so osnova za vse ostalo.
Od metana (CH₄) do dekana (C₁₀H₂₂) sledijo logičnemu vzorcu. Metan ima 1 ogljik, etan 2, propan 3... Vsakič se molekula "podaljša" za eno CH₂ skupino.
Poglej razliko v strukturnih formulah: metan je samo CH₄, etan je CH₃-CH₃, propan CH₃-CH₂-CH₃. Kot bi dodajal perle na vrvico - vedno dodaš CH₂ v sredino.
Pri testih boš moral poznati tako imena kot molekulske formule. Najbolje je, če si jih zapomniš po parih: metan-etan, propan-butan, pentan-heksan...
💡 Pomni: Imena alkanov so osnova za poimenovanje VSEH organskih spojin - zato jih je vredno res dobro znati!
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IUPAC poimenovanje razvejanih alkanov
Ko alkani niso več preproste ravne verige, ampak imajo "veje", potrebuješ sistematičen pristop. IUPAC nomenklatura je kot GPS za kemijo - te vodi po pravilni poti do imena.
Prvi korak: najdi najdaljšo neprekinjeno verigo ogljikovih atomov. To ni vedno očitno - včasih se najdaljša veriga vije kot kača! Ta veriga določi osnovno ime .
Drugi korak: oštevilči verigo tako, da imajo stranske skupine najnižje možne številke. Če lahko šteteš z leve ali desne, izberi smer, ki da manjše številke.
Alkilne skupine (stranske skupine) dobiš iz imen alkanov - samo končnico -an zamenja -il. CH₃ je metil, C₂H₅ je etil...
💡 Trik: Vedno najprej išči najdaljšo verigo - to je največja past pri testih!
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Pravila za sestavljanje imena
Zadnji korak pri IUPAC poimenovanju je kot sestavljanje pravilnega naslova - vse mora biti na svojem mestu. Začneš s številko C-atoma, dodaš vezaj, nato ime stranske skupine in končaš z imenom osnovne verige.
Če imaš več enakih stranskih skupin, uporabi predpone: di- (dve), tri- (tri), tetra- (štiri). Številke ločuješ z vejicami: 2,3-dimetil.
Pri več različnih stranskih skupinah jih naštej po abecednem redu - etil pride pred metil. Pazi: predpone di-, tri- se ne upoštevajo pri abecedi!
Strukturni izomeri so kot dvojčka z različnimi osebnostmi. C₄H₁₀ je lahko butan (ravna veriga) ali 2-metilpropan (razvejana veriga). Ista formula, drugačna zgradba, različne lastnosti.
💡 Pogosta napaka: Ne pozabi preveriti, ali si res izbral najdaljšo možno verigo - krajša ni vedno bolj očitna!
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Reševanje primerov korak za korakom
Pri 2-metilpentanu najprej preštej najdaljšo verigo - 5 ogljikov pomeni pentan. Nato preveri, od kod je bolje šteti: z leve stranska skupina na C2, z desne na C4. Izbereš levo (manjša številka).
Stranska skupina CH₃ je metil, zato dobiš 2-metilpentan. Preprosto, če znaš korake!
Zahtevnejši primer je 3-etil-2,4-dimetilheksan. Tu imaš 6 ogljikov v najdaljši verigi (heksan) in tri stranske skupine. Paziti moraš na abecedni red: etil pride pred metil.
Ključ do uspeha je sistematičnost - vedno sledi istim korakom, ne preskoči nobenega. Tako ne boš naredil napake niti pri najtežjih primerih.
💡 Za test: Narišij si strukturo na papir in oštevilči ogljike - tako lažje vidiš najdaljšo verigo!
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Lastnosti alkanov in praktični nasveti
Alkani so nepolarne molekule, kar pomeni, da se ne mešajo z vodo (polarno). Kot olje in voda - "podobno se topi v podobnem" je zlato pravilo.
Vrelišče narašča z dolžino verige. Metan je plin, heksan tekočina, daljši alkani pa trdne snovi. Razlog? Daljše molekule se "lepijo" skupaj z močnejšimi medmolekulskimi silami.
Razvejani alkani imajo nižje vrelišče kot nerazvejani z istim številom ogljikov. Veje preprečujejo tesno "pakiranje" molekul.
Pogeste napake pri testih: napačno izbrana najdaljša veriga, napačna smer štej, pozabljene predpone di-/tri-, napačen abecedni red. Če se ti to dogaja, naredi checklist in ga vsakič preveri!
💡 Gorenje alkanov: CH₄ + 2O₂ → CO₂ + 2H₂O - to je osnova za vse reakcije gorenja!
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Povzetek za hitro ponavljanje
Alkani = nasičeni ogljikovodiki (samo enojne vezi), formula CₙH₂ₙ₊₂, končnica vedno -an. Prvih 10 imen moraš znati na pamet - so osnova za vse!
IUPAC poimenovanje v štirih korakih: najdaljša veriga → oštevilčenje → poimenovanje stranskih skupin → sestavljanje imena. Pazi na abecedni red in predpone!
Alkani so nepolarne snovi, vrelišče narašča z dolžino, gorijo z O₂ v CO₂ in H₂O. Izomeri = ista formula, različna struktura.
To je tvoja osnova za organsko kemijo - če obvladaš alkane, boš lahko osvojil tudi alkohole, aldehide in druge spojine. Samo vadi sistematično!
💡 Zadnji nasvet: Naredi si lastne flashcards z imeni in strukturami - ponavljanje je ključ do uspeha!
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