CHEMISTRY COMMUNITY

marcus lin 1E

How do we determine if a reactant is zero order?

marcus lin 1E

How do we plot a second order reaction on a graph to get a straight line?

marcus lin 1E

Why do we have to assume that the slow step comes after the fast step?

marcus lin 1E

Why is the slow step the rate determining step?

marcus lin 1E

How do we use OH- to balance out half reactions in alkaline solutions?

marcus lin 1E

When balancing alkaline half reactions why do we use OH- instead?

marcus lin 1E

Hi! Because of scheduling issues would anyone in chem 14c lec 1 MWF 12-1250 next quarter like to switch into my discussion on wed at 2-250??

marcus lin 1E

what does the problem mean when referring to the unique rate of reaction?

marcus lin 1E

would T be in kelvins?

marcus lin 1E

what's the significance of the standard cell potential being either negative or positive?

marcus lin 1E

How do you find either K1 or K2 in the equation if it's bracketed within ln?

marcus lin 1E

If we're only given the standard cell potential of reduction, how do we find the standard cell potential of oxidation?

marcus lin 1E

What's the difference between a galvanic cell and a voltaic cell?

marcus lin 1E

how do we calculate the oxidation states?

marcus lin 1E

When writing the half reactions, when do we know to add on H+ or H2O to the equation?

marcus lin 1E

What does delta G represent?

marcus lin 1E

If you're given standard conditions of delta H and delta S, will T= 25+273.15 since the standard conditions assume T is at 25 celsius?

marcus lin 1E

What's the difference between C(sub v), C (sub p), and just C?

marcus lin 1E

why is (V2/V1) equal to (P1/P2)?

marcus lin 1E

what's the difference between reversible and irreversible?

marcus lin 1E

What's the definition of a state property?

marcus lin 1E

When is deltaG negative and positive? What's the significance?

marcus lin 1E

How do we calculate the pH of 0.055 M AlCl3 when the equilibrium constant isn't given?

marcus lin 1E

how do we solve for x when it comes out to a cubic function?

marcus lin 1E

so if we ignore x and it isn't less than 5% of the original molarity and is therefore invalid, do we just continue to calculate x quadratically?

marcus lin 1E

so for some of the ICE table calculations we ignore x and just pretend it's 0, when do we do that?

marcus lin 1E

so for some of the ICE table calculations we ignore x and just pretend it's 0, when do we do that?

marcus lin 1E

How does a change in pressure affect the reaction?

marcus lin 1E

How are Q and K related?

marcus lin 1E

Can you use ICE tables for partial pressure?

marcus lin 1E

what are some amphoteric compounds besides water, Dr. Lavelle didn't go over any besides water in lecture

marcus lin 1E

What is the difference between Bronsted and Lewis bases?

marcus lin 1E

why did Dr. Lavelle draw some of the NH3 ligands as NH3 and H3N on the molecule?

marcus lin 1E

how does the VSEPR model formula work? what if there's two central atoms and two lone pairs on each, would the formula have E4 or E2?

marcus lin 1E

why can't atoms freely rotate around double and triple bonds?

marcus lin 1E

what does VSPER stand for and do we need to memorize it?

marcus lin 1E

Do you draw it towards the least or most electronegative atom

marcus lin 1E

Do you just take the averages of the bond lengths in a resonance structure?

marcus lin 1E

Why does the formal charge on the central atom have to be as close to zero as possible?

marcus lin 1E

What are the exceptions to how atoms fill up their orbitals for electron configurations>

marcus lin 1E

How do you determine where the negative formal charge lies in a negatively charged molecule?

marcus lin 1E

Why does the formal charge on the central atom have to be as close to 0 as possible?

marcus lin 1E

What does degeneracy of an orbital mean

marcus lin 1E

Can someone explain to me why the electron affinity trend is up and to the right?

marcus lin 1E

What is ionization energy and why is its trend up and to the right?

marcus lin 1E

Will we have to remember the mass of an electron for the tests/quizzes?

marcus lin 1E

So Dr. Lavelle was talking about how h/4pi is the same as h with that line through it/2pi, can someone explain the difference?

marcus lin 1E

Can someone explain how I'd go about calculating the freq/wavelength/energy of an electron when only given the energy of the light used to eject said electron?

marcus lin 1E

So for De Broglie's Equation, you have to divide planck's constant (h) by momentum. But the units of h are in J*s and momentum is in kg*m/s, can someone explain to me how the units cancel out to get a unit appropriate for wavelength?

marcus lin 1E

Yeah I think Dr. Lavelle's point is that the wavelength is only measurable in a quantum context. It doesn't seem to be something to stress over for the quizzes and tests.

marcus lin 1E

So if light only had wave properties then increasing the intensity of the light should allow light of an insufficient frequency to eject electrons. But this is not the case, so we can consider photons as packets of energy where each photon will interact with one electron.

marcus lin 1E

I think you mean lambda instead of delta, but i think the equation only considers the wavelength (lambda) and the frequency (v).

marcus lin 1E

So in the case of 3 moles CO2 and 6 moles of H2O, CO2 is the limiting reactant as CO2 and H2O react in a 1:1 ratio. Since the reaction produces an equal number of moles of O2, there will be 3 moles of O2 produced and just multiply that by O2's molar mass to get the grams of O2.

marcus lin 1E

I think for part b you'd have to use stoichiometry to find the number of moles for both products. To get moles NaOH you'd divide 2.00g NaOH by its molar mass and for the Copper Nitrate you'd multiply its concentration by its number of litres. Then you'd find the limiting reactant and treat it like a...

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