CHEMISTRY COMMUNITY

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H2CO3 is formed when CO2 reacts with water, which makes it more acidic.

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Thank you! I didn't realize their connections.

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I think the format is the same as the midterm, with multiple-choice questions.

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If the molecule is not symmetric, then it is (generally) polar because the dipole moments (if any) do not cancel out. If the molecule is symmetric but the outside atoms are not the same, then it is polar because the dipole moments do not cancel out. If the molecule is symmetric and the outside atom...

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Hi, when balancing equations, I usually start with Carbon, Hydrogen, and then Oxygen.

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Every equation should be able to be balanced. Some human errors can prevent equations from being balanced.

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A strong acid will disassociate completely in water. Of note there are seven you have to just memorize (HCl, HBr, HI, HNO 3 , H 2 SO 4 , HClO 4 , HClO 3 ). All other acids are considered weak. When comparing weak acids to one another, considering factors such as bond strength and polarization are h...

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Yes, meters are SI units, which are generally used in equations.

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We can determine bond length by the number of bonded electrons. The bond lengths go from single bonds>double bonds> triple bonds.

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Yes, we should memorize the common polyatomic ions used in this class.

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the formula for pH is −log [H+].

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There should be a box of special characters you can use to input your answer. Hope this helps

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A conjugate acid is when an acid donates a proton to a base.

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Chlorine has a higher electronegativity. It is farther right to the periodic table

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When you have fractions as coefficients, you have to multiply the entire equation so that all coefficients are whole numbers.

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We can find the bond angles through molecular geometry. There are charts to help memorize the bond angles.

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Cations are usually metals and anions are nonmetals.

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The formal charge indicates when the atom is gaining or losing an electron. A positive would mean that the storm is losing an electron, while a negative means it would gain an electron.

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A little overwhelmed and anxious for all the finals to come on Week 10. But I'm glad we have Thanksgiving Break to relax and to enjoy the holidays.

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Like many other people have noted before me, there are plenty of useful charts to help get VSEPR theory down! I've attached one that I use below that covers shape, angle, an example of a molecule and hybridization! https://data.templateroller.com/pdf_docs_html/86/862/86292/vsepr-theory-molecular-sh...

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Just making sure, it's online for Chem14A-3 right?

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Hi, I'm definitely excited to be able to come home for Winter Break. I don't have any big plans in mind but I'm planning on doing the traditional "Christmasy" activities.

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Hi, I believe we will have lectures on the Monday (11/22) and Wednesday (11/24) of thanksgiving week.

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I use the AXE notation to help remember chemical shapes. The AXE notation helps determine the central atoms (A), Terminal Atoms (X), and the lone pair elctrons (E).

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The E-textbook is preferred because it provides additional resources. The online textbook includes Acheive, which is required for this class.

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Just making sure, Chem 14B for the winter quarter will be in person correct? I was unsure because we were given a poll of our preference for online or in-person.

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One way that I will prepare for the exam is by going to the step-up sessions. Hopefully, this will work for you too.

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Hi, for the midterm we will only have access to the periodic table and the constants sheet.

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I think the chemical equations will be given in the midterm for the formulas we have not learned yet.

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Hi, when solving equations, I tend to use the least amount of sig figs shown in the equation. For example, if the lowest amount of sig figs in the equation is 2, my final answer will only have 2 sig figs.

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The E represents the lone pair electrons

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One thing that helps me stay motivated is to set a schedule for me to follow. This helps me stay on track with my goals and assignments, and hopefully it will do the same to you.

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One thing that helps me stay motivated is to set a schedule for me to follow. This helps me stay on track with my goals and assignments, and hopefully it will do the same to you.

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Hello, H, He, Li, and Be are all exceptions to the octet rule because their electrons only fill up the 1s and 2s orbitals. They do not have the room to store 8 electrons.

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Hi, I find it is easiest to find formal charges after drawing a lewis structure of that compound so that we are able to see all the atoms and their bonds. The formula for finding the formal charge is FC= V-N-(B/2). V represents the number of valence electrons, and N represents the lone-pair valance ...

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Hi, I think of ionic bonds as electron interactions between nonmetal and metal atoms. Covalent bonds are between two nonmetal atoms

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I search for study music on Spotify and "lofi music" usually pops up. Its instrumentals and I find that it's very calming, and helps me focus on my homework. Hope this helps!

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Happy Birthday, Professor!! Thank you for everything you do!

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Hi, the octet rule is the idea that atoms prefer to have 8 valance electrons surrounding them. ALthough this always isn't possible, according to however amount of valance electrons you have, the central atom should always have an octet.

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My TA mentioned that we can review our answers over the TA's office hours.

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Hi, I believe that we should round our answer to the smallest amount of sig figs given in the equation.

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Hi, we can use double bonds when we are trying to achieve an octet within the atom.

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Hi, the central atom should be the atom with the lowest ionization energy. Ionization energy increase across a table and decreases down a group.

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Hi, I'm currently studying for my midterm and I think that doing the textbook problems will help prepare us.

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Thank you so much. I felt like this class is a little difficult because it covers so much material in just one quarter. I'm glad to know that the concepts we are learning in this class will also be covered in other classes that I will take.

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Hi, I think the cheat sheet that you are referring to is the constants and equations sheet, which is provided by Professor Lavelle. We can also bring a copy of the periodic table.

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Hi, I believe that all answers when determining velocity should be under the speed of light (3.0 x 10^8ms).

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Periods are categorized horizontally in rows across the tables. Groups are separated in vertical columns down the table. Atomic size decreases across the period and increases down the group.

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Hi! Thanks for sharing, I feel like it would be so helpful during exams.

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Hi, although there are no assessments, the videos are supplements to the main lecture. I felt like they were very helpful and clarified any remaining questions I had.

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I am printing out a periodic table from Professor Lavelle's website in case he does not provide one for the exam.

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Constructive interference is when two waves collide and create a higher amplitude of one single wave. Destructive interference is when two waves collide and cancel each other out, thus creating a smaller wave.

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It is better to multiply the equation until you get whole integers as your coefficient.

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As of right now, the formulas will be given to us. But, we will eventually have to remember the molecular formulas from actual names.

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I use the periodic table that is provided by Achieve. I just printed it out for reference.

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Hi, one cycle is considered one Hertz (Hz) per second.

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The theoretical yield should be less than the actual yield. This is due to the fact that excess product is not always calculated into the equation.

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Yes, the theoretical and actual yield should be written in the SI units of grams. However, % yield should be written in percentages.

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Yes, we should always check to see if the equation is balanced before continuing with the rest of the work.

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I believe there isn't any prior preparation needed besides reviewing the lectures and taking notes.

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I usually wait until the last step to round my number to the correct amount of sig figs.

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I totally feel the same. I had taken Chemistry sophomore year in high school and it's extremely frustrating to memorize concepts from 3 years ago. However, Professor Lavelle has a lot of helpful modules to work through

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It isn't required to memorize the conversions but I feel like it would be helpful because they are not given to you on tests.

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It isn't required to memorize the conversions but I feel like it would be helpful because they are not given to you on tests.

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Hi! To figure out which units to put in the numerator or denominator, I put the units I'm trying to cancel on the denominator. For example, if I'm trying to find the mol of 10g of Oxygen, I would line up my units to cancel out grams. 10g O x 1mol O/16g. Using this method, you're able to cancel units...

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