CHEMISTRY COMMUNITY

Jaqueline Monreal 2L

I heard it was 3 times a week last quarter , but i think it might depend on how your TA grades

Jaqueline Monreal 2L

sig figs are usually 2 digits rounded

Jaqueline Monreal 2L

it is usually two digits rounded

Jaqueline Monreal 2L

I think you have to post 3 times a week , thats what he said last quarter but im not sure about this one

Jaqueline Monreal 2L

I think we can pick it up after spring break starting week 3.

Jaqueline Monreal 2L

Thank you for the advice ! I'll be sure to save my notes for later

Jaqueline Monreal 2L

delta G= 0: rxn is at equilibrium

Jaqueline Monreal 2L

you add both in order to balance the Hs and Os on each side of the reaction

Jaqueline Monreal 2L

probably during our next discussion

Jaqueline Monreal 2L

i flip the anode equation

Jaqueline Monreal 2L

gibbs free energy, electrochemistry

Jaqueline Monreal 2L

they are usually spontaneous if they're values are negative, meaning they are releasing energy

Jaqueline Monreal 2L

next week during discussion

Jaqueline Monreal 2L

delta G tells us if a reaction releases( if delta G is negative) or absorbs ( if delta G is positive) energy

Jaqueline Monreal 2L

higher negative gibbs free energy doesnt affect the rate of reaction, it just mean that the reaction will release more energy

Jaqueline Monreal 2L

you can use either one

Jaqueline Monreal 2L

i think it would be best to convert to J in case

Jaqueline Monreal 2L

you do both the method for calculating change in volume: deltaS= nR ln(V2/V1) and for change in temperature: change in delta S= C ln(T2/T1) , and then add the two entropies

Jaqueline Monreal 2L

they are different systems- and closed system can exchange energy but not matter with its surroundings while an isolated system cant exchange either one

Jaqueline Monreal 2L

the second law says that energy transformation is not 100% efficient, the degree of disorder of the universe increases with every transformation

Jaqueline Monreal 2L

Isolated system: cannot exchange energy or matter with surroundings
Closed system: can exchange energy, nut not matter with surroundings

Jaqueline Monreal 2L

i dont think its necessary to memorize any units , it may be helpful but i think the conversions will be provided when needed

Jaqueline Monreal 2L

catalysts only change how fast a reaction is performed but doesnt change any of the concentrations

Jaqueline Monreal 2L

concentration at equilibrium

Jaqueline Monreal 2L

an acids donates a proton H+ and a base accepts the proton

Jaqueline Monreal 2L

endothermic- formation of products is favored by a increase in temperature
raising the temperature of a reaction mixture at equilibrium will shift the reaction in the endothermic direction
exothermic- formation of products is favored by a decrease in temperature

Jaqueline Monreal 2L

the safest thing to do is use the acid base formula to make sure

Jaqueline Monreal 2L

Usually the reactant are on the right and the products on the left seen using the basic model equation Aa+Bb<->Cc+Dd

Jaqueline Monreal 2L

Q: gives the reaction quotient at any moment
K: gives the reaction quotient at equilibrium
Q<K : forward reaction favored
Q>K : reverse reaction favored

Jaqueline Monreal 2L

The yield of NH3 Increases when the amount of NH3 decreases because if the yield didn't increase then system wouldn't be in chemical equilibrium, decreasing product leads to more reactions on the reactant side which lead to an increase in product.

Jaqueline Monreal 2L

the angles for seesaw are <90 and <120

Jaqueline Monreal 2L

they accept both chloro is the traditional way of calling it and chlorito is the new way

Jaqueline Monreal 2L

for bronsted : acids donate protons and bases accepts protons
for lewis: acids accept electrons and bases donate electron

Jaqueline Monreal 2L

Yes the Roman numerals will always be positive

Jaqueline Monreal 2L

Water is neutral because it can both receive an proton (act as base) and give a proton (act as acid )

Jaqueline Monreal 2L

Since there is an electron pair , instead of having a 90 and 120 bond angle twist have a <120 and <90 bond angle

Jaqueline Monreal 2L

lavelle said in lecture that you don't need to know the exact bond angle of the angles that are slightly less than the regular angle , you just have to show that you know it is slightly less than the regular angle

Jaqueline Monreal 2L

single bond consists of a sigma bond
double bond consists of a sigma bond and pi bond
triple bond consists of a sigma bond and a pi bond

Jaqueline Monreal 2L

the outline is posted online if you wanna know more into detail on what we're gonna be tested on but you should study the lectures from after the midterm up to last monday's lecture before break

Jaqueline Monreal 2L

in lecture i think he said he would make sure that we wouldn't have to worry about drawing the 3d versions of the shapes since they can be difficult to draw , im not sure how we would show the shapes though, maybe just the 2d version

Jaqueline Monreal 2L

although they both have four bonds the square planar has 2 more areas of electron density because of the extra 2 lone pairs, therefore they have to be different shapes

Jaqueline Monreal 2L

im not sure but i think its the most effective and reliable way to figure it out, maybe you can use the VSEPR formula to figure it out

Jaqueline Monreal 2L

polarizability increases right to left and up to down , which is the same as atomic radius and opposite of electronegativity

Jaqueline Monreal 2L

polar molecules result from polar bonding between atoms where electrons are not shared equally atoms from the same element do not form polar bonds because they share electrons equally the greater the difference in electronegativity then the more ionic the bond is and bonds that have ionic bonds nonp...

Jaqueline Monreal 2L

i dont think you have to write it but it should be used to create your structure and make sure you did it correctly and have no extra overall charges (whether positive or negative) in your structure

Jaqueline Monreal 2L

i would look over the outlines he provided up to lewis acids and bases which is where he ended the lecture that he said the midterm was up to

Jaqueline Monreal 2L

the trends are useful for figuring out which element does in the center when drawing a lewis structure

Jaqueline Monreal 2L

yeah we should know the first three rows of the s p and d block and also know the exceptions like Cu and Cr

Jaqueline Monreal 2L

I'm pretty sure that the quantities of wavelengths for the light category that we need to use will be given to us, the outline doesn't say that we need to memorize them

Jaqueline Monreal 2L

i think the most important thing to know is what each equations is associated with and the keywords problems have that let you know what formula to use, and the units that go with each part of the equations so your answer has the correct units at the end

Jaqueline Monreal 2L

I think test 2 test up the multi electron atoms which is where we left off on in last Friday's lecture

Jaqueline Monreal 2L

i would ask to your TA if you can show work using the Rydberg equation

Jaqueline Monreal 2L

yes to calculate wavelength you should always convert to meters to make sure youre converting correctly, and im pretty sure that most problems use joules as the unit for energy

Jaqueline Monreal 2L

theres a negative number to show that when the energy levels decrease, energy is lost , so the calculated energy using this formula will be negative

Jaqueline Monreal 2L

Because the molecular formula basically tells exactly the amount of atoms that are in each element and not the ratio, then all you have to do is count how many atoms are of each element type and make them your subscript for that element in the molecular formula

Jaqueline Monreal 2L

Scientific calculator is the best option , in lecture he said non-graphic calculators or calculators where you could store information or equations

Jaqueline Monreal 2L

Yeah I think doing the modules will be really helpful even because they show what topics to focus on and what we might get tested on later

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