CHEMISTRY COMMUNITY

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yes it means 3 protons, which would have been phosphoric acid

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Can someone explain to me how to derive the Van't Hoff Equation again? Thank you!

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Can someone help me out with question 7D.5 in the textbook (7th edition)? It's on page 630 in the textbook and deals with some rate laws with different temperatures. Thank you!!

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Can someone explain to me what bimolecular means? Thank you!!

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Can someone explain to me what pseudo 1st order rate law and pseudo 2nd order rate law means? Thank you!!

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Is the rate law dependent or independent of the concentration of the reactants? Why? Thank you!!

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For a spontaneous process, is delta G positive or negative? Thank you!!

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What is the difference between 1 and 2 lines in a cell diagram? Thank you!!

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Can someone please explain to me the electron flow diagram that we covered in class? The one with the anode, cathode, and salt bridge. Thank you!!

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What type of situation allows for max work? In terms of Pressure and Temperature. Thank you!!

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What is the relationship between K and delta G? Thank you!!

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Is free energy a state function? If so how do we add it up? Thank you!!

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Can someone explain to me why W(reversible) is greater than W(irreversible)? Thank you!!

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How does volume affect entropy when it increases or decreases? Why? Thank you!!

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Can someone explain to me what degeneracy is and how it relates to entropy? Thank you!!

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What type of system is a bond calorimeter? Why? Thank you!!

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Is a bond formation exothermic or endothermic? Why? Thank you!!

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What is the difference between heat capacity and specific heat capacity? Thank you!!

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What is the typical temperature of interest used for calculating delta H's? Thank you!!

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Can someone explain what standard reaction enthalpy is to me? Thank you!!

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Can someone explain to me the Hess's method of calculating overall bond enthalpies? Thank you!!

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Can someone explain to me when to use bars versus when to use molarity during partial pressure problems? Thank you!!

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Can someone explain the conjugate seesaw to me? Thank you!!

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Can someone tell me the autoprotolysis equation and explain it to me? Thank you!!

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Does adding more concentration affect K? Why or why not? Thank you!!

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Can someone explain to me how the values of Q and K determine whether the reactions proceeds forward or reverses? Thank you!!

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Can someone explain homogeneous versus heterogeneous equilibriums to me? Thank you!!

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In an unusual situation, one nitrogen gas molecule is trapped in an alveoli sac. Alveoli are tiny sacs in the lungs whose average diameter is 1.5x10^-4m.
(a) Find the uncertainty in velocity of the nitrogen molecule within the sac.

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What is the mass that we use for De Broglie's in this part of the problem? Is it just the weight of the electron or the weight or the electron scaled up with Avogadro's number because it said 1 mol of electrons in part A?

Thank you!!

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Can someone explain part A of this question to me? Having some trouble with the math.

Thank you!!

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Can someone explain parts A and B of this question to me? I'm having a problem with the conceptual aspect of this question.

Thank you!!

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Thank you for your help this quarter!!!

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Can someone explain to me the effect that salts have on acids and bases respectively?

Thank you!!

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Can someone explain the difference between amphoteric and amphiprotic and give me an example of each?

Thank you!!

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For midterm question 3B, can someone explain it to me? I keep getting down to the last few steps and messing it up.

Thank you!!

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What is the relationship between strong and weak bases and getting partially or fully ionized in water?

Thank you!!

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I know amines come from ammonia, but what are some examples of amines?

Thank you!!

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Why do bases have a soapy feel?

Thank you!!

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do pi bonds allow free rotation? if not, what happens to the bonds if there is rotation?

thank you!!

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for single and double bonds, how many sigma and pi bonds are there respectively?

thank you!!

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can someone explain to me the hybridization of BeCl2?

thank you!!

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Can someone explain to me the transition from octahedral to square planar shape?
Thank you!!

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Can someone explain to me what makes a bond angle distorted? And is it always slightly less than the typical angle when it is distorted?
Thank you!!

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Can someone explain to me the bond angles in a trigonal bipyramidal shape? (Phosphorous pentachloride for example)

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What is the typical attractive energy for hydrogen bonds?

Thank you!!

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Why is interaction potential energy always negative?

Thank you!!

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Do lone pairs on neighboring atoms repel each other or are they attracted to each other? Whichever one it is, why is this the case?

Thank you!!

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When we draw Lewis structures on the midterm, do we have to draw all resonance structures or just give one structure that works? Thank you!!

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When drawing Lewis structures, I know H, He, Li, Be, and all of Group 13 don't need to have a full octet. For Group 13 though, does this mean they don't ever have a full octet? Or they just don't need to have one? Thank you!!

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Can someone explain to me the difference between electron affinity and ionization energy? Also, could you explain the trends of both of them on the periodic table? Thank you!!

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Do non-metals form cations or anions? Whichever one it is, why is this the case? Thank you!!

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What is the trend of the size of ionic radii down the groups and across the periods? Thank you!!

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What unit should we measure atomic radius in? I know it's a lot smaller than a meter but I don't remember what it was measured in exactly. Thank you!!

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Could someone explain how to convert from KJ/mol to J?

I must have missed this during the lecture

thank you!!

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What is the significance of the principle quantum number?

I know it is represented by "n" but I don't know what it means exactly

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I'm confused on the order of energy of the orbitals...

does it go s>p>d>f? or does it go s<p<d<f?

also, can someone explain why the order of the energy levels is like that?

thank you!!

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In the equation E(n)=-hR/n^2, where does the negative come from?

Thank you!

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Are we supposed to memorize the visible light spectrum? I know the general idea that as wavelength increases energy decreases and vice versa, but are we supposed to know the numbers attached to the entire spectrum?

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Hi,

On Friday we went over a problem at the end of class that asked if the wavelength of an electron traveling at 5.3 x 10^6 m/s could be calculated. When we plugged in the numbers, we were given 9.11 x 10^-31 kg. Where does this number come from?

Thank you!!

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Do you recommend comparing each reactant to the product? Or instead calculating both reactants in terms of moles and balancing them and then seeing which one is less?

I got the same answer both ways but I don't know which way is better.

Thank you!!

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I keep getting 5.75 x 10^-4 instead of 10^-3...

What am I doing wrong?

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For balancing chemical equations do we need to show any work?

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