CHEMISTRY COMMUNITY

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The overall rate is determined by the slowest step because the reaction is not completed until this step is finished, which is why it is considered rate determining

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If there are no solids in your half reactions, you will have to add Pt(s) to it.

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Rate constants should always be positive

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Unfortunately he hasn't updated us on the final format ):

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Ecell and K are positively related

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rate constant can change due to temperature changes

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Yes you can use any trial to find K

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Simplifying can be done at the very end for the overall equation

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I don't think I saw the shortcut equation with .05916 on the equations sheet so I used Ln

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Yes, you would leave H2O out of the diagram

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I think it is important that you know how to derive this equation

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When balancing acidic solutions, you would add H2O to balance the O's and then add H+ to balance the H's out. For balancing basic solutions, you would add H2O to balance the O's and then add H2O to the other side and OH- on the opposite side. From here, you would balance electrons for both types of ...

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You should use Q when the reaction is not at equilibrium.

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Gibbs free energy can help determine spontaneity.

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Definitely use Kelvin

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It is like that to make sure the equation is balanced on both sides

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When Ecell equals zero, the reaction is at equilibrium.

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Workshops are review sessions tailored for those who understand material and would like more practice. Step up sessions are made for students who need help doing problems since the UA's go slowly and step by step.

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Oxidizing agents get reduced while reducing agents get oxidized.

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Can someone explain to me what the purpose of the salt bridge is?

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I believe the standard notation for a cell diagram has an anode on the left and a cathode on the right .

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IF E is negative, it indicates that the forward reaction is not spontaneous, while the reverse reaction is spontaneous

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Yes you can use it at STP

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The Boltzmann Equation is used to find residual entropy

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An adiabatic reaction is one where there is no heat transfer

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I think it depends on the TA but as long as you do five posts a week it should be okay

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He doesn't curve tests but at the end of the quarter, he adjusts the overall class grades

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In adiabatic processes, there is no heat transfer, so q is = to 0.

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Enthalpy is a state function which means their enthalpy values could be added/subtracted together

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On the heating curve, the x axis has q and the y axis has temperature. If the graph has a steep slope, this means there is a small increase in q and a bigger increase in temperature, which means the substance has a low heat capacity.

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Irreversible processes are done under pressure that remains constant whereas reversible processes aren't. Gases have to do more work when pressure is not constant, which is why reversible processes do more work.

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If the expansion of the gas is isothermal, then this means the temperature remains constant and delta U = 0

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Delta H indicates the change in enthalpy while Delta U indicates change in internal energy of the system. Delta U = Delta H + work

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The first law of thermodynamics discusses conservation of energy. Energy can't be created nor destroyed.

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Increasing the temperature would lead to an increase in entropy of the system

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Molecules can only be cancelled if they are on opposite sides of the equation

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In this case, delta H is positive

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They will most likely be provided for the midterm

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No solids and liquids are not included in the ICE table because they don't experience changes in concentration

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Going to UA sessions help out a lot! Doing the assigned book problems ahead of time can help with the tests too.

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Khan Academy definitely helps me the most!

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The lower the pKa, the stronger the acid. The lower the pKb, the stronger the base!

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The X can be ignored because it is so small and wouldn't cause a change in concentration

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If delta H is positive and heat is added, then the equilibrium will shift to the products side. If delta H is negative and heat is added, then equilibrium will shift to the reactants

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He normally does not post a practice test before.

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When are we supposed to use the Ideal Gas Law

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K, a constant, demonstrates the ratio of products and reactants so it does not have units

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The TAs check to make sure we make at least 5 posts each week. They only check to see that you've done 5, so any extra questions don't count as extra credit.

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His lectures are not bruincasted unfortunately. You could always ask someone to send you a picture of the slides!

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I don't think it is but the homework turned in during discussion is graded.

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When the pH of a solution is 7, that's when the concentrations of H3O and H+ are equal to one another.

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Solids don't have a concentration and liquids are considered pure substances and their concentration does not change

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Concentration could never have a negative value so negative answers should be omitted

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Peer learning sessions are extremely useful sessions that are led by undergraduate assistants. They usually go over practice problems or have their own worksheets for you to do to help you better understand the material.

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If the reaction is exothermic and heat is added, then the reverse reaction would be favorable, causing more reactants to form. Heat can be seen as a product here, so if heat is added, more reactants will form.

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If the temperature changes, the reaction shifts to one side in equilibrium, changing K

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K is found when the reaction is at equilibrium, whereas Q can be found at any time during the reaction. Q helps us identify which way the reaction is proceeding

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It is a hexadentate and has a charge of -4

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It is also important to know dien, which is a tridentate (:

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Can someone explain to me how resulting anion stability correlates to acid strength

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how do you find KA values

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what is pKA and why is it important

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NH3, or ammonia, is typically a weak base.

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lewis bases typically donate electron pairs while lewis acids accept electron pairs

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A compound can be identified as a amphoteric compound if they accept and donate hydrogen ions.

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Yes, a bronsted base accepts protons while bronsted acids donates protons.

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Bronsted acids and bases deal with protons whereas Lewis acids and bases deal with electrons. For example, a bronsted base accepts protons while a lewis base donates electrons

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All polydentates have 2+ lewis base sites so it donates 2 or more electron pairs to the central atom

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Polydentates are ligands that bind to the transition metal at several sites. It refers to the ligand's amount of binding sites

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I believe the final is cumulative, so it will have everything we learned this quarter.

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Yes it should be less than 9- or 120 because the lone pairs should create a repulsion.

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It is able to form 6 bonds

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How do you find the oxidation state of an element?

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Can someone tell me the definition of these two? I am still bit confused.

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Can someone tell me what exactly are coordination compounds?

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A ligand is a molecule or atom that bind to a central metal atom. They can also be described as electrons donors.

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A represents the central atom, X represents the bonded atom, and E represents the lone pairs

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Electron distortion refers to how easily it is for an electron cloud to be pulled or attracted to another atom or molecule. The larger a molecule is, the less it is attracted towards its own nucleus, so its electron cloud is more easily distorted than that of small molecules. Big molecules are more ...

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Although we do not need to know how to draw the true shape of molecular structures, we have to know the name and be able to identify the shape.

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For the test, do we have to know how to determine the degree of bond angles in the structure?

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I don't think we will be receiving a chart but learning and using the periodic table trends of electronegativity will definitely help you out!

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Both London forces and Van Der Waals interactions are the same thing and can replace each other in a a sentence. These are the weakest intermolecular forces compared to the others.

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What material is going to be on the test next week? Will we have to draw VSEPR models on the test?

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For homework this week, what sections are we allowed to do??

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smaller cations have high polarizing power while big anions have high polarizability. Polarizability measures how easily an electron cloud can be distorted while polarizing power measures the ability of an ion to polarize another ion

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large ions are highly polarizable because as electron distance from the nucleus increases, the valence electrons feel a reduced attraction to the nucleus and are easily attracted to nuclei of other molecules.

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Because they are located in period two, where there is no d block for the electrons to backfill.

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Nitrogen has a higher ionization energy because it is more stable than oxygen. it has three electrons in its p orbital, which means each orbital has one electron. However, oxygen has four, creating an electron electron repulsion that makes it easier to remove their electron from O than N

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Resonance structures are Lewis Structures for a compound that can alternate in regards to where their electrons are. Their structure stays the same but electrons are moved around.

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It will be material from after the midterm!

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Electronegativity increases as you move up and to the right of the periodic table, which makes Fluorine the most electronegative

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you're right!

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Delta X is the uncertainty in the position, while Delta P represents the uncertainty in momentum.

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n = a #
l = (n-1)
ml = -l ... +l
ms = -1/2 or + 1/2

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Hz is the measurement of frequency and it is 1 cycle per second

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Can someone describe the trends of the periodic table that we need to know again?

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How do know which elements don't have to follow the octet rule?

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I don't think it is on the midterm.

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What is the difference between Aufbau's Principle and Hunds rule?

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Will the midterm be covering topics for high school? For example, would we get any limiting reactant questions or molarity questions?

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