Chemistry is all about understanding how atoms connect and interact... Show more
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Polyatomic Ions and Ionic Bonding
Polyatomic ions are charged groups of atoms that act as a single unit in chemical reactions. Important examples include acetate (C₂H₃O₂⁻), oxalate (C₂O₄²⁻), phosphate (PO₄³⁻), and sulfate (SO₄²⁻). These ions play crucial roles in many chemical processes and compounds.
Ionic bonds form when metals transfer electrons to non-metals, creating oppositely charged ions that attract each other. This creates a crystal lattice structure rather than individual molecules. Ionic compounds are electrically neutral overall, with the positive and negative charges balancing each other perfectly.
When writing ionic formulas, use subscripts to balance the charges. For transition metals that can form multiple charges, use Roman numerals to indicate the charge (like iron(II) or iron(III)). When naming ionic compounds, list the cation first, followed by the anion - monatomic anions typically end with "-ide."
Remember this! Ionic compounds dissolve in water to form electrolytes that conduct electricity, while their strong bonds give them high melting and boiling points.
Covalent Bonds and Molecular Compounds
Unlike ionic compounds, covalent bonds form when non-metals share electrons rather than transferring them. This creates molecular compounds with distinct individual molecules instead of a continuous crystal lattice. The point where attraction is strongest between atoms forms the covalent bond.
Covalent bonds vary in strength - double bonds are shorter and stronger than single bonds. The energy required to break a bond is called bond dissociation energy. Remember that when writing formulas for covalent compounds, you don't simplify to the lowest whole number ratio like you do with ionic compounds.
Seven elements exist naturally as diatomic molecules: hydrogen (H₂), nitrogen (N₂), oxygen (O₂), fluorine (F₂), chlorine (Cl₂), bromine (Br₂), and iodine (I₂). These elements never exist as single atoms under normal conditions.
Quick tip! When naming binary covalent compounds, name the first element as is, add the suffix "-ide" to the second element, and use prefixes to indicate the number of each atom.
Lewis Dot Structures
Lewis dot structures show how atoms share electrons in molecules. To draw them, start by counting the total valence electrons and identifying the central atom (usually the least electronegative, never hydrogen). Draw single bonds from the central atom to surrounding atoms, then distribute remaining electrons to satisfy the octet rule.
If the central atom doesn't have eight valence electrons (and it's not boron or beryllium, which are exceptions), move electron pairs from outer atoms to form double or triple bonds. Remember that the octet rule mainly applies to carbon, nitrogen, oxygen, and fluorine - elements in Period 3 and beyond can have expanded octets.
For polyatomic ions, follow the same steps but adjust the total electron count based on the charge (add electrons for negative ions, subtract for positive). When drawing the final structure, place brackets around it with the charge indicated.
Important concept! Some molecules show resonance, where electrons can be drawn in different but equally valid arrangements. We represent this with double-headed arrows between possible structures, but in reality, the bonds have intermediate character between these forms.
Molecular Shapes and Hybridization
The shape of a molecule dramatically affects its reactivity. According to the VSEPR theory (Valence Shell Electron Pair Repulsion), electron pairs around a central atom repel each other and arrange themselves to minimize repulsion.
Electron domains include both bonded pairs and lone pairs. The number of domains determines the electron domain geometry: 2 domains form linear arrangements, 3 domains create trigonal planar shapes, and 4 domains make tetrahedral arrangements.
However, the actual molecular geometry is determined only by the positions of atoms, not lone pairs. For instance, with 4 electron domains where 1 is a lone pair, the molecular geometry is trigonal pyramidal (like ammonia, NH₃), with bond angles of about 107° rather than the ideal 109.5° of a perfect tetrahedron.
Visualize this! Hybridization explains the observed molecular shapes: sp hybridization creates linear molecules, sp² gives trigonal planar shapes, and sp³ forms tetrahedral arrangements. The type of hybridization corresponds directly to the number of electron domains.
Molecular Polarity and Intermolecular Forces
Molecules can be polar or nonpolar depending on both bond polarity and molecular shape. In polar covalent bonds, electrons are shared unequally between atoms with different electronegativities, creating partial positive (δ+) and partial negative (δ-) charges.
However, a molecule with polar bonds can still be nonpolar overall if its shape is symmetrical. For example, carbon dioxide has polar C=O bonds, but its linear shape means these polarities cancel out. Generally, asymmetric molecules with lone pairs on the central atom tend to be polar.
Intermolecular forces are attractions between molecules (not chemical bonds). The weakest are London dispersion forces (temporary attractions due to electron movement), which exist between all molecules but are strongest in larger molecules with more electrons.
Real-world application! Water's polarity explains why it's such a good solvent. Its partially negative oxygen attracts positive ions, while its partially positive hydrogens attract negative ions, allowing ionic compounds to dissolve easily.
Hydrogen Bonding and States of Matter
Hydrogen bonding is an exceptionally strong type of dipole-dipole interaction that occurs when hydrogen is bonded to highly electronegative elements with lone pairs - specifically fluorine, oxygen, or nitrogen. This creates a particularly strong attraction between molecules.
These powerful intermolecular forces explain water's unusually high boiling point compared to similarly sized molecules. Hydrogen bonds are also crucial for biological structures like DNA and proteins, where they help maintain specific shapes.
The strength of intermolecular forces directly affects physical properties. Substances with stronger intermolecular forces generally have higher melting and boiling points because more energy is required to overcome these attractions. At room temperature, compounds with very strong intermolecular forces are typically solids, while those with weaker forces exist as liquids or gases.
Connect the dots! When a substance melts or boils, it's not breaking chemical bonds but overcoming intermolecular forces. The stronger these forces, the more heat energy required for phase changes.
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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
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❗️❗️⚠️
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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
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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
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THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
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Honors Chemistry Unit 4: Comprehensive Study Guide
Chemistry is all about understanding how atoms connect and interact with each other. This guide covers essential chemical bonding concepts including ionic and covalent bonds, molecular structures, and the forces that hold molecules together. These fundamental principles explain how and... Show more
Polyatomic Ions and Ionic Bonding
Polyatomic ions are charged groups of atoms that act as a single unit in chemical reactions. Important examples include acetate (C₂H₃O₂⁻), oxalate (C₂O₄²⁻), phosphate (PO₄³⁻), and sulfate (SO₄²⁻). These ions play crucial roles in many chemical processes and compounds.
Ionic bonds form when metals transfer electrons to non-metals, creating oppositely charged ions that attract each other. This creates a crystal lattice structure rather than individual molecules. Ionic compounds are electrically neutral overall, with the positive and negative charges balancing each other perfectly.
When writing ionic formulas, use subscripts to balance the charges. For transition metals that can form multiple charges, use Roman numerals to indicate the charge (like iron(II) or iron(III)). When naming ionic compounds, list the cation first, followed by the anion - monatomic anions typically end with "-ide."
Remember this! Ionic compounds dissolve in water to form electrolytes that conduct electricity, while their strong bonds give them high melting and boiling points.
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Covalent Bonds and Molecular Compounds
Unlike ionic compounds, covalent bonds form when non-metals share electrons rather than transferring them. This creates molecular compounds with distinct individual molecules instead of a continuous crystal lattice. The point where attraction is strongest between atoms forms the covalent bond.
Covalent bonds vary in strength - double bonds are shorter and stronger than single bonds. The energy required to break a bond is called bond dissociation energy. Remember that when writing formulas for covalent compounds, you don't simplify to the lowest whole number ratio like you do with ionic compounds.
Seven elements exist naturally as diatomic molecules: hydrogen (H₂), nitrogen (N₂), oxygen (O₂), fluorine (F₂), chlorine (Cl₂), bromine (Br₂), and iodine (I₂). These elements never exist as single atoms under normal conditions.
Quick tip! When naming binary covalent compounds, name the first element as is, add the suffix "-ide" to the second element, and use prefixes to indicate the number of each atom.
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Lewis Dot Structures
Lewis dot structures show how atoms share electrons in molecules. To draw them, start by counting the total valence electrons and identifying the central atom (usually the least electronegative, never hydrogen). Draw single bonds from the central atom to surrounding atoms, then distribute remaining electrons to satisfy the octet rule.
If the central atom doesn't have eight valence electrons (and it's not boron or beryllium, which are exceptions), move electron pairs from outer atoms to form double or triple bonds. Remember that the octet rule mainly applies to carbon, nitrogen, oxygen, and fluorine - elements in Period 3 and beyond can have expanded octets.
For polyatomic ions, follow the same steps but adjust the total electron count based on the charge (add electrons for negative ions, subtract for positive). When drawing the final structure, place brackets around it with the charge indicated.
Important concept! Some molecules show resonance, where electrons can be drawn in different but equally valid arrangements. We represent this with double-headed arrows between possible structures, but in reality, the bonds have intermediate character between these forms.
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Molecular Shapes and Hybridization
The shape of a molecule dramatically affects its reactivity. According to the VSEPR theory (Valence Shell Electron Pair Repulsion), electron pairs around a central atom repel each other and arrange themselves to minimize repulsion.
Electron domains include both bonded pairs and lone pairs. The number of domains determines the electron domain geometry: 2 domains form linear arrangements, 3 domains create trigonal planar shapes, and 4 domains make tetrahedral arrangements.
However, the actual molecular geometry is determined only by the positions of atoms, not lone pairs. For instance, with 4 electron domains where 1 is a lone pair, the molecular geometry is trigonal pyramidal (like ammonia, NH₃), with bond angles of about 107° rather than the ideal 109.5° of a perfect tetrahedron.
Visualize this! Hybridization explains the observed molecular shapes: sp hybridization creates linear molecules, sp² gives trigonal planar shapes, and sp³ forms tetrahedral arrangements. The type of hybridization corresponds directly to the number of electron domains.
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Molecular Polarity and Intermolecular Forces
Molecules can be polar or nonpolar depending on both bond polarity and molecular shape. In polar covalent bonds, electrons are shared unequally between atoms with different electronegativities, creating partial positive (δ+) and partial negative (δ-) charges.
However, a molecule with polar bonds can still be nonpolar overall if its shape is symmetrical. For example, carbon dioxide has polar C=O bonds, but its linear shape means these polarities cancel out. Generally, asymmetric molecules with lone pairs on the central atom tend to be polar.
Intermolecular forces are attractions between molecules (not chemical bonds). The weakest are London dispersion forces (temporary attractions due to electron movement), which exist between all molecules but are strongest in larger molecules with more electrons.
Real-world application! Water's polarity explains why it's such a good solvent. Its partially negative oxygen attracts positive ions, while its partially positive hydrogens attract negative ions, allowing ionic compounds to dissolve easily.
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Hydrogen Bonding and States of Matter
Hydrogen bonding is an exceptionally strong type of dipole-dipole interaction that occurs when hydrogen is bonded to highly electronegative elements with lone pairs - specifically fluorine, oxygen, or nitrogen. This creates a particularly strong attraction between molecules.
These powerful intermolecular forces explain water's unusually high boiling point compared to similarly sized molecules. Hydrogen bonds are also crucial for biological structures like DNA and proteins, where they help maintain specific shapes.
The strength of intermolecular forces directly affects physical properties. Substances with stronger intermolecular forces generally have higher melting and boiling points because more energy is required to overcome these attractions. At room temperature, compounds with very strong intermolecular forces are typically solids, while those with weaker forces exist as liquids or gases.
Connect the dots! When a substance melts or boils, it's not breaking chemical bonds but overcoming intermolecular forces. The stronger these forces, the more heat energy required for phase changes.
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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?
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Is Knowunity really free of charge?
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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 THE SCHOOLGPT. 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 THE SCHOOLGPT. 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