CHEMISTRY COMMUNITY

Jesse H 2L

Thank u Athena and Dr. DJ LAVELLE for the best in the business post-lecture songs

Jesse H 2L

the moles of electrons transferred

Jesse H 2L

Brandon Tao 1K wrote:What is nernst equation?

the equation developed by Nernst E=E with the little degree circle - RT/nF nlQ

Jesse H 2L

I used the log form for like literally everything.

Jesse H 2L

know the axis and the orientation of the plot

Jesse H 2L

elementary as in simple, noncomplex, easy problems so to speak

Jesse H 2L

to get the real cell potential, we need to reverse the anode reduction reaction to make it an oxidation reaction.

Jesse H 2L

I mean, you can always just multiply the entire equation by a coefficient to get rid of the 1/2

Jesse H 2L

in a galvanic cell, the electrons flow in the spontaneous direction, and this flow of electrons is how the battery works, and is generally the only direction of flow, (anode to cathode), the salt bridge allows for ionization and keeps the solutions neutral.

Jesse H 2L

electrochemistry

Jesse H 2L

[Cl][/2] is both reduced and oxidized, since the oxidized form is given, we need to find the reduced form.

Jesse H 2L

the electrons flow from the oxidation half reaction in the anode and flow into the reduction half reaction of the cathode (an ox, red cat)

Jesse H 2L

a ridiculous amount of practice problems.

Jesse H 2L

the answer key is wrong for sure

Jesse H 2L

increasing concentrations of products and reactants will cause the reaction to shift the same according to le chateliers principle.

Jesse H 2L

John Liang 2I wrote:The main principle is focus on charge first when balancing the redox rxn. When the number of electrons are balanced on both sides, the elements are probably going to be balanced. this is faster than looking at the elements first. hope this helps!

does this apply under any conditions?

Jesse H 2L

Samuel G Rivera - Discussion 4I wrote:I'm in the 3pm lecture, but if it's the same song he played for us it's called Hazey by Glass Animals

ur a savior, thank you.

Jesse H 2L

DOES ANYONE KNOW THE NAME OF THE SONG DR. DJ LAVELLE WAS BOPPIN' TODAY AFTER CLASS? (FRIDAY 2/21/20 1PM LECTURE) THANKS.

Jesse H 2L

net rotational degrees of freedom, linear molecules only have 2, nonlinear molecules have 3 and the degrees of freedom contribute to the heat capacity.

Jesse H 2L

at constant volume, deltaV = 0, so there is no w expansion work being done, which means deltaU is only equal to q (deltaU=q+w). At constant pressure, expansion work may be occurring, and this change can only be deltaH or q as a result of the heat given off.

Jesse H 2L

q=mC(deltaT) plug n chug

Jesse H 2L

What was the equation that Lavelle shared for calculating the change in mols for a combustion rxn?

Jesse H 2L

Basically everything up to outline 4, excluding the stuff from chapter 5.

Jesse H 2L

approx 1.380649×10−23 J/K

Jesse H 2L

Steam has way more energy than liquid as a result of the energy required to vaporize liquid, and as a result, the phase change releases more energy onto your skin in the form of heat and burns more

Jesse H 2L

Does the substance in the bomb calorimeter get heat added to it? In my mind, I feel like that would mess up the measurement of the heat released by the actual reaction. I thought that the experiments in the bomb calorimeter had to spontaneously occur? Bomb calorimeters still require a heat source, ...

Jesse H 2L

standard reaction enthalpy is the enthalpy for the overall reaction while standard enthalpy of formation is the enthalpy of one mole of product formed from its parts

Jesse H 2L

delta h and q are the same at constant pressure.

Jesse H 2L

Use PV=nRT

Jesse H 2L

inverse relationship, high Ka, low pka means stronger acid, low Ka, high pka weaker acid

Jesse H 2L

inversely proportional, and an increase in volume in a system is only recognized if it is the result of change in volume, which is usually assumed unless the problem involves pumping an inert gas into a system

Jesse H 2L

most certainly outline 1.

Jesse H 2L

can someone explain composite equations, as in hw 5h.3? thanks

Jesse H 2L

Thermodynamic stability referring to the relative energy of the closed systems, in which the lowest energy is considered more "thermodynamically" stable.

Jesse H 2L

I know that the quick way to explain the changes in pressure is that if the volume decreases and there are more moles of gas on the left, then the reaction proceeds to the right and vice versa. But why is this the short way? If you know that the volume decreases, then you also know that there is st...

Jesse H 2L

we cannot increase the concentration of a pure solid or liquid in an equilibrium expression so it is regarded as equal to 1 and hence ignored in calculation.

Jesse H 2L

According to the testing schedule posted on the syllabus, Test 1 should be on 1/21/2020, in discussion section.

Jesse H 2L

is it better to convert all values of Kc to Kp before continuing to solve a problem (making an ICE table and so on...) using the ideal gas equation, or is it better to do it as the textbook instructs?

Jesse H 2L

how do we determine if a ligand is polydentate?

Jesse H 2L

A sigma bond is just an area of two orbitals overlapping creating a significant area of electron density.

Jesse H 2L

Based on disassociation. An acid is strong when it completely dissociates in water, and is weak when it only partially dissociates. Higher or lower acidity is usually relative.

Jesse H 2L

Will CTF be of any major significance on the final?

Jesse H 2L

How do we determine whether or not chelation occurs in a molecule? Thanks

Jesse H 2L

Hund's rule.

Jesse H 2L

505316964 wrote:Can someone explain why s has no nodal plane? thanks!

there aren't enough electrons that exist within that orbital to form nodes in which case a plane would form, electrons can exist wherever they want within the spherical s orbital

Jesse H 2L

if atoms with more electrons have more places where electrons can be found, why does this also increase the amount of nodal planes in that atom? electrons push each other away, more electrons means more pushing each other way until they shape the orbitals, more orbitals means more chances for nodal...

Jesse H 2L

Natalie C 1K wrote:if atoms with more electrons have more places where electrons can be found, why does this also increase the amount of nodal planes in that atom?

electron pair repulsion creates gaps

Jesse H 2L

I think it wouldn't hurt to brush up on some general chem just to be safe.

Jesse H 2L

Anything, in this case, from topic 2 (the quantum world) included in the outline.

Jesse H 2L

all materials were to be provided in discussion.

Jesse H 2L

Midterms yes, finals TBA.

Jesse H 2L

A higher frequency results in more energy per photon so that each photon has enough energy to eject electrons. Increasing the intensity of light means more photons, more photons with enough energy means more ejected electrons.

Jesse H 2L

I believe that the frequency is the amount of energy per photon according to the wave model.

Jesse H 2L

law of conservation of mass

Jesse H 2L

convert to grams

Jesse H 2L

precision is consistent results while accuracy is how close to the true value we can get.

Jesse H 2L

converting to moles is likely a more reliable strategy and probably just a better habit

Jesse H 2L

g.mol-1 is interchangeable with g/mol, the exponent -1 denoting the fraction

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