CHEMISTRY COMMUNITY

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He was dope! A very funny dude and he made class fun :^)

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I was wondering this too!! I didn’t know if I should email him or not :/

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I was confused about this too, but I don’t think there’s any difference between chemistry van’t hoff and van’t hoff.

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Atoms are hard to trust. I heard they make up everything...

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Someone threw sodium chloride at me. I’m still salty.

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I would tell you a joke about chemistry, but they Argon.

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I hope all of this advice helped! :)

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Thanks for being such a cool professor! I wish you the best!

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If Silver Surfer and Iron Man teamed up, they’d be alloys.

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If the number of e- don’t match on both sides of the reaction, then did I balance the redox reaction incorrectly? Do they have to be the same for the reactant and product/cancel out?

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Use vertical lines between different phases (i.e. s|g|l|aq) and double vertical lines between anode and cathode (anode||cathode). Use commas between molecules of the same phase ( i.e Pt(s), C(s) )

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In this equation, n is equal to the number of electrons being transferred, so you would first have to balance the half reactions.

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There are many ways to manipulate the equation, as you can manipulate the variables solve for dH, K2, K1, T2, and T1. The main use for the equation is to relate the change in K to the change in temperature.

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When finding Q in the nernst equation, is it always [cathode]/[anode] or is it [anode]/[cathode] ?

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If there isn't a salt bridge, then how are the charges maintained/balanced?

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I know the difference between the two cells is because of the charge of the anode/cathode, but how do you know whether the anode/cathode is positive or negative?

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How can you tell which solution is the anode and which solution is the cathode? How do you know which way the electrons are flowing?

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How do you know when you need H+ or H2O? How do you know you need to balance O or H?

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What does the equation measure? How does it relate to gibbs free energy?

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Will test 2 include all topics learned during week 8 also?

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They’re helpful if you want extra practice problems, but some of it is pretty simple. It’s helpful to learn the basics of a topic.

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If you’re not given the charge, how would you know which elements/molecules are reduced or oxidized?

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Gibbs free energy tells us about the spontaneity of a reaction. If it is less than 0, then the process is exergonic and will proceed spontaneously in the forward direction. If it is greater than 0, then the process is endergonic and will proceed spontaneously in the reverse direction. If it is equal...

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Entropy is 0 in an isothermal reversible system.

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A reaction is spontaneous when delta G is less than 0.

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delta S is equal to 0 in an isothermal reversible system.

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Delta U is the change in internal energy. Internal energy is the energy contained within a system.

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When a system is reversible, dS_total = dS_system + dS_surroundings is equal to 0.

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PDTVHUGS, Pressure(P) Density(D) Temperature(T) Volume(V) Enthalpy(H) InternalEnergy(U) GibbsFreeEnergy(G) Entropy(S)

I think Lyndon's went something like this:
If you're under Pressure and Depressed, just watch some TV and get lots of HUGS.

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Yes, energy is neither created nor destroyed, but it can be transformed or transferred. It is conserved over time.

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The First Law of thermodynamics is a "version" of the Law of Conservation of Energy. They're the same thing, but the First Law is adapted for thermodynamic processes.

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delta U is equal to 0 when temperature is constant. If delta U is 0, and deltaU=q+w, then 0=q+w and when you solve for q then the equation becomes q= -w

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Just remember "iso" means same (equal measurements), "baric" is for pressure, and "choric" is for volume.

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Open systems allow everything (matter and heat) to go in and out. Closed systems only allow heat to go in and out. Isolated systems don't allow either in or out.

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How do you know which direction the reaction will go based off of K and Q values?

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I didn't have Lavelle last quarter for 14A, so I'm not sure how the review sessions are and the amount is overwhelming. Which workshops/drop-ins/review sessions would you suggest? Thank you.

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What is the purpose of a calorimeter, and how accurate is it?

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How do I know when to use the (U = q - w) equation and when to use the (H = U + PV)?

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How do you make sure that the reaction is in standard state?

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You use the ICE table when trying to find a missing concentration. Ka and the initial concentration of the reactant are usually given.

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Is the standard state the same for all elements?

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How does a change in temperature affect enthalpy?

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How is enthalpy related to the spontaneity of a reaction?

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What happens to equilibrium if the temperature goes higher or lower than 25C?

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How do we know which R constant to use in calculation?

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Why are solids and liquids disregarded when calculating K and Q?

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Why is the H2O ignored when creating the ICE box?

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Test 1 covers all of chemical equilibrium and acids and bases.

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How does titration affect equilibrium?

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It could possibly be used to find the partial pressure of a molecule if you are looking for Kp.

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Both are equilibrium constants. K is the general constant while Kc is the constant denoted when calculating with concentrations, just like how Kp is used when calculating with pressures.

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How can I identify a salt in a reaction?

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How do you know the strength of an acid or a base just by looking at what molecules/atoms it's made of?

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