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Základy organické chemie: Alkeny, alkany a další
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Úvod do organické chemie a alkany
Představ si, že každá organická sloučenina je jako stavebnice z lega - uhlík tvoří hlavní kostru a vodík ji doplňuje. Alkany jsou nejjednodušší typ těchto "stavebnic" s obecným vzorcem C(n)H.
Alkany mají pouze jednoduché vazby a můžou mít různé tvary. Rozlišujeme n-alkany (rovné řetězce), iso/neo-alkany (rozvětvené) a cykloalkany (kruhovité).
Homologická řada alkanů je jako rodina sloučenin - každý další člen má o skupinu -CH2- více. Začíná methanem (CH₄) a pokračuje ethanem, propanem až po složitější molekuly.
Tip: Zapamatuj si názvy prvních deseti alkanů - budou se ti hodit při každé zkoušce z organiky!
Homologická řada a strukturní izomerie
Od methanu (CH₄) po undekan (C₁₁H₂₄) - to je základní řada, kterou musíš znát nazpaměť. Každá sloučenina má o jeden uhlík a dva vodíky více než předchozí.
Strukturní izomerie se objevuje od butanu dál - stejný sumární vzorec, ale jiné uspořádání atomů. Je to jako sestavit ze stejných kostek lega různé tvary.
Čím víc je molekula rozvětvená, tím nižší má bod varu. Proč? Protože rozvětvené molekuly se k sobě hůř "přitisknou" a Van der Waalsovy síly jsou slabší.
IUPAC nomenklatura ti pomůže systematicky pojmenovávat sloučeniny: najdi nejdelší řetězec, pojmenuj boční skupiny, sečti je abecedně a očísluj pozice.
Pozor: Čísluj vždy tak, aby substituenty měly nejnižší možná čísla!
Alkeny a jejich vlastnosti
Alkeny jsou mnohem zajímavější než alkany - obsahují dvojnou vazbu a mají vzorec C(n)H(2n). Tahle dvojná vazba dělá z alkenů reaktivní sloučeniny, které rádi reagují s halogeny.
Od ethenu (C₂H₄) po větší molekuly - alkeny tvoří s halogeny olejovité kapaliny, které se ve vodě nerozpustí. To je důležitá vlastnost pro mnoho průmyslových aplikací.
Dvojná vazba není jen "dva páry elektronů" - je to místo, kde se může dít spousta chemických reakcí. Alkeny proto slouží jako suroviny pro výrobu plastů a dalších materiálů.
Zajímavost: Ethen (ethylen) se používá k dozrávání ovoce - banány ho dokonce sami produkují!
Alkyny a radikálová substituce
Alkyny s trojnou vazbou a vzorcem C(n)H jsou ještě reaktivnější než alkeny. Ethyn (acetylen) se používá při svařování kvůli vysoké teplotě plamene.
Radikálová substituce je reakce, kde se atom vodíku v alkanu nahradí jiným atomem - typicky halogenem. Probíhá ve třech fázích, které si zapamatuj jako I-P-T.
Iniciace: Světlo rozštěpí Br₂ na dva radikály. Propagace: Řetězová reakce, kde radikál reaguje s alkanem a vytvoří nový radikál. Terminace: Dva radikály spolu zareagují a reakce se zastaví.
Radikálové reakce nejsou jen laboratorní kuriozita - rozklad ozonu freony probíhá stejným mechanismem. Jeden chlorový radikál zničí tisíce molekul ozonu!
Důležité: Radikálové reakce potřebují energii (světlo, teplo) k zahájení, pak už běží samy.
Frakční destilace ropy
Frakční destilace je způsob, jak z ropy získat benzín, naftu a další užitečné produkty. Principem jsou různé body varu - kratší molekuly vaří při nižších teplotách.
Ropa se zahřeje na 400°C, odpaří se a páry vstoupí do destilační kolony. Nahoře kondenzují lehké frakce (plyny, benzín), dole těžké (mazací oleje, asfalt).
Proces je kontinuální - páry stoupají, kondenzují, znovu se odpařují a postupně se čistí. Každé patro kolony má jinou teplotu, takže se molekuly "třídí" podle velikosti.
Výsledkem je široká škála produktů: od topných plynů přes benzín až po asfalt (nad C₂₀). Bez tohoto procesu by neexistovala moderní doprava ani petrochemie.
Fakt: Jedna rafinerie zpracuje denně tisíce tun ropy a vyrobí stovky různých produktů!
Elektrofilní adice a cis-trans izomerie
Elektrofilní adice je klíčová reakce alkenů a alkynů. "Elektrofil" hledá elektrony a dvojná/trojná vazba mu jich nabídne dostatek. Halogeny se tak "přidají" k násobné vazbě.
U alkenů dvojná vazba zmizí a vznikne halogenalkan. U alkynů se trojná vazba změní na dvojnou a může reagovat znovu - proto alkyny berou dva halogeny.
Cis-trans izomerie se objevuje u alkenů s dvojnou vazbou, kde jsou na každém uhlíku dva různé substituenty. Cis znamená "na stejné straně", trans "na opačných stranách".
Tahle izomerie není jen teoretická záležitost - cis a trans izomery mají často úplně jiné vlastnosti. Například nenasycené tuky v "trans" formě jsou nezdravější než v "cis" formě.
Tip na zkoušku: Nakresli si dvojnou vazbu jako pevnou tyč - kolem ní se nedá otáčet, proto vzniká izomerie!
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
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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
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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
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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
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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
Základy organické chemie: Alkeny, alkany a další
Organická chemie je fascinující svět, kde se všechno točí kolem uhlíku - prvku, který tvoří základ všeho živého i mnoha materiálů, které používáš každý den. Pochopit alkany, alkeny a jejich reakce ti pomůže rozumět, jak fungují paliva, plasty nebo dokonce... Show more
Úvod do organické chemie a alkany
Představ si, že každá organická sloučenina je jako stavebnice z lega - uhlík tvoří hlavní kostru a vodík ji doplňuje. Alkany jsou nejjednodušší typ těchto "stavebnic" s obecným vzorcem C(n)H.
Alkany mají pouze jednoduché vazby a můžou mít různé tvary. Rozlišujeme n-alkany (rovné řetězce), iso/neo-alkany (rozvětvené) a cykloalkany (kruhovité).
Homologická řada alkanů je jako rodina sloučenin - každý další člen má o skupinu -CH2- více. Začíná methanem (CH₄) a pokračuje ethanem, propanem až po složitější molekuly.
Tip: Zapamatuj si názvy prvních deseti alkanů - budou se ti hodit při každé zkoušce z organiky!
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Homologická řada a strukturní izomerie
Od methanu (CH₄) po undekan (C₁₁H₂₄) - to je základní řada, kterou musíš znát nazpaměť. Každá sloučenina má o jeden uhlík a dva vodíky více než předchozí.
Strukturní izomerie se objevuje od butanu dál - stejný sumární vzorec, ale jiné uspořádání atomů. Je to jako sestavit ze stejných kostek lega různé tvary.
Čím víc je molekula rozvětvená, tím nižší má bod varu. Proč? Protože rozvětvené molekuly se k sobě hůř "přitisknou" a Van der Waalsovy síly jsou slabší.
IUPAC nomenklatura ti pomůže systematicky pojmenovávat sloučeniny: najdi nejdelší řetězec, pojmenuj boční skupiny, sečti je abecedně a očísluj pozice.
Pozor: Čísluj vždy tak, aby substituenty měly nejnižší možná čísla!
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Alkeny a jejich vlastnosti
Alkeny jsou mnohem zajímavější než alkany - obsahují dvojnou vazbu a mají vzorec C(n)H(2n). Tahle dvojná vazba dělá z alkenů reaktivní sloučeniny, které rádi reagují s halogeny.
Od ethenu (C₂H₄) po větší molekuly - alkeny tvoří s halogeny olejovité kapaliny, které se ve vodě nerozpustí. To je důležitá vlastnost pro mnoho průmyslových aplikací.
Dvojná vazba není jen "dva páry elektronů" - je to místo, kde se může dít spousta chemických reakcí. Alkeny proto slouží jako suroviny pro výrobu plastů a dalších materiálů.
Zajímavost: Ethen (ethylen) se používá k dozrávání ovoce - banány ho dokonce sami produkují!
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Alkyny a radikálová substituce
Alkyny s trojnou vazbou a vzorcem C(n)H jsou ještě reaktivnější než alkeny. Ethyn (acetylen) se používá při svařování kvůli vysoké teplotě plamene.
Radikálová substituce je reakce, kde se atom vodíku v alkanu nahradí jiným atomem - typicky halogenem. Probíhá ve třech fázích, které si zapamatuj jako I-P-T.
Iniciace: Světlo rozštěpí Br₂ na dva radikály. Propagace: Řetězová reakce, kde radikál reaguje s alkanem a vytvoří nový radikál. Terminace: Dva radikály spolu zareagují a reakce se zastaví.
Radikálové reakce nejsou jen laboratorní kuriozita - rozklad ozonu freony probíhá stejným mechanismem. Jeden chlorový radikál zničí tisíce molekul ozonu!
Důležité: Radikálové reakce potřebují energii (světlo, teplo) k zahájení, pak už běží samy.
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Frakční destilace ropy
Frakční destilace je způsob, jak z ropy získat benzín, naftu a další užitečné produkty. Principem jsou různé body varu - kratší molekuly vaří při nižších teplotách.
Ropa se zahřeje na 400°C, odpaří se a páry vstoupí do destilační kolony. Nahoře kondenzují lehké frakce (plyny, benzín), dole těžké (mazací oleje, asfalt).
Proces je kontinuální - páry stoupají, kondenzují, znovu se odpařují a postupně se čistí. Každé patro kolony má jinou teplotu, takže se molekuly "třídí" podle velikosti.
Výsledkem je široká škála produktů: od topných plynů přes benzín až po asfalt (nad C₂₀). Bez tohoto procesu by neexistovala moderní doprava ani petrochemie.
Fakt: Jedna rafinerie zpracuje denně tisíce tun ropy a vyrobí stovky různých produktů!
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Elektrofilní adice a cis-trans izomerie
Elektrofilní adice je klíčová reakce alkenů a alkynů. "Elektrofil" hledá elektrony a dvojná/trojná vazba mu jich nabídne dostatek. Halogeny se tak "přidají" k násobné vazbě.
U alkenů dvojná vazba zmizí a vznikne halogenalkan. U alkynů se trojná vazba změní na dvojnou a může reagovat znovu - proto alkyny berou dva halogeny.
Cis-trans izomerie se objevuje u alkenů s dvojnou vazbou, kde jsou na každém uhlíku dva různé substituenty. Cis znamená "na stejné straně", trans "na opačných stranách".
Tahle izomerie není jen teoretická záležitost - cis a trans izomery mají často úplně jiné vlastnosti. Například nenasycené tuky v "trans" formě jsou nezdravější než v "cis" formě.
Tip na zkoušku: Nakresli si dvojnou vazbu jako pevnou tyč - kolem ní se nedá otáčet, proto vzniká izomerie!
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Sign up to see the contentIt's free!
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Improve your grades
Join milions of students
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