CHEMISTRY COMMUNITY

Alexis Robles 2k

It will most likely be printed and scanned once we finish. But we do not know until Lavelle emails us later today.

Alexis Robles 2k

So the online final is going to be at the same time as if it were the in-person final?

Alexis Robles 2k

If the final is going to be shorter and still be 180 points, is each problem going to worth 30 points? 40 points?

Alexis Robles 2k

As of right now, we do not know. All he said that it is short and open book final.

Alexis Robles 2k

How will we turn in week 10 homework assignment if classes are now online? Or do we still go to discussion?

Alexis Robles 2k

What is the difference between the first-order and the second-order? When do we use one over the other? Thanks

Alexis Robles 2k

When do we use the rate law equation?

Alexis Robles 2k

K is not dependent on the concentration of the products and reactants. K is only dependent on temperature and activation energy.

Alexis Robles 2k

Yes, it will be the last homework assignment for the quarter.

Alexis Robles 2k

We will probably get them back in week ten discussion?

Alexis Robles 2k

When do we use the Nernst equation compared to the other equations for electrochemistry?

Alexis Robles 2k

Only 5g and 5j as 4i and 4j were on the midterm

Alexis Robles 2k

Test 2 will cover the second page of thermodynamics and all of electrochemistry.

Alexis Robles 2k

It should be similar to test 1, so around 7-10 questions.

Alexis Robles 2k

There is no review session for test 2, I recommend to do homework problems to study.

Alexis Robles 2k

What is the difference between a single line (l) vs two lines (ll) in a cell diagram? Thanks

Alexis Robles 2k

How can you tell which elements are undergoing reduction or oxidation?

Alexis Robles 2k

Is this equation going to be on test 2?

Alexis Robles 2k

Test two starts Tuesday of week 9 and covers everything after the midterm up to Electrochemistry.

Alexis Robles 2k

There are no extra credit opportunities in Lavelle class.

Alexis Robles 2k

the two equations are
∆G°=∆H°-T∆S°
∆G°=-RTlnK.

Alexis Robles 2k

He doesn't curve the midterm but assigns grades at the end of the quarter depending on the overall class performance.

Alexis Robles 2k

G knot means that the elements in the equation are in their standard state.

Alexis Robles 2k

I believe it will be on stuff we learn after the midterm up to test 2

Alexis Robles 2k

What was the equation for phase changes? I know it had something to do with deltaH but forgot the rest?

Alexis Robles 2k

Whenever it is T alone, you should use kelvin but when it is deltaT, you can use Celcius or kelvin.

Alexis Robles 2k

It will be given on the equation sheet.

Alexis Robles 2k

What is the difference between q= mCdeltaT and q=CdeltaT? when should we use the m/n in the equation?

Alexis Robles 2k

What specifically do we need to know for the midterm? I know it is only the beginning but what equations should we know how to use? Thanks

Alexis Robles 2k

Delta u= q+w
q= heat
w=work

Alexis Robles 2k

You can, you just need to email them.

Alexis Robles 2k

yeah, its Constant external pressure.

Alexis Robles 2k

What is the difference between Standard Reaction Enthalpy and Standard Enthalpy of Formation? Thanks.

Alexis Robles 2k

I'm confused about when and why we use the integral to find the area under the curve? Can somebody explain this?

Alexis Robles 2k

The Midterm is on February 12th, Wednesday. Week 6

Alexis Robles 2k

What is Hess's Law?

Alexis Robles 2k

What is the difference between Standard reaction enthalpy and Standard enthalpy formation?

Alexis Robles 2k

what makes Enthalpy a state?

Alexis Robles 2k

From the three methods, why should we use a certain method over the others? Thanks

Alexis Robles 2k

What do we need to know about Conjugate Seesaw? I am confused about this. Thanks.

Alexis Robles 2k

What is the R constant in PV=nRT, I keep hearing there are different R constant and I am confused about that?

Alexis Robles 2k

How does temperature affect the conditions when solving?

Alexis Robles 2k

is H20 the only thing we leave out when doing an ICE table?

Alexis Robles 2k

What is the 5% rule and when do we apply it? Thanks.

Alexis Robles 2k

What is the difference between all the K?

Alexis Robles 2k

What is Chatelier's Principle and when do we use it?

Alexis Robles 2k

What is the difference between Q and K?

Alexis Robles 2k

So we do not use units for K? Can someone explain this to me?

Alexis Robles 2k

When do we use PV = nRT, I am confused about what this is for? Can someone explain this? Thanks :)

Alexis Robles 2k

When is test 1? Is it during week two discussion and if so, what topics are going to be on the test?

Alexis Robles 2k

For the final, do we need to write the name for coordination compounds in the New IUPAC Name Convention or is the regular/"old" one fine?

Alexis Robles 2k

I forget what Dr. Lavelle said about on which one we do not need to know how to solve. I believe he said we don't need to worry about weak acid but I'm not sure. Can someone explain what we need to know for the final?

Alexis Robles 2k

So the final has 8 questions correct? So is the material on the final going to be stuff we learned after the midterm? Or is it going to be on everything?

Alexis Robles 2k

Can someone explain what he went over on Wednesday that is 14b material? I am confused about what exactly we need to know.

Alexis Robles 2k

Do we have to know the section on the slide where he divided ([h3O+][HCo3-])/([H2Co2]) to find Ka1 and he repeated it two more times to find Ka2 and Ka3? Then he ranked them Ka1>Ka2>Ka3. I just want to know if we have to know how to do this for the test?

Alexis Robles 2k

The coordination number of central atom is the total number of ligands bonded to it correct?

Alexis Robles 2k

What is the difference between Pka and Ka? Thank you

Alexis Robles 2k

Do we have to memorize the table from the book plus more for naming compounds for the final?

Alexis Robles 2k

Do we have to do anything to get the 50 points for the 50 posts we made or the TA just looks at our total post?

Alexis Robles 2k

Has Dr. Lavelle posted the final test locations and times?

Alexis Robles 2k

What is the equation to find the oxidation?

Alexis Robles 2k

When do you add the -ate ending to the naming? Thanks

Alexis Robles 2k

So if the element has a negative charge, we change the end to an O? for example, Cyanide to Cyano

Alexis Robles 2k

In the periodic table, Carbon has 4 valence electrons and Tetravalent is having 4 valence electrons.

Alexis Robles 2k

A single bond is always a pi bond, a double bond is one sigma and one pi bond. A triple bond is two pi bonds on the outsides and a sigma bond in the middle.

Alexis Robles 2k

We just need to know the names and not draw them for the test?

Alexis Robles 2k

For Test 2, We don't need to know exact angles for some molecules correct? Only 90,109.5, 120, and 180?

Alexis Robles 2k

Dipole Induced is the same as London correct? and they all fall under Van der Waals?

Alexis Robles 2k

For test 2, do we just have to name molecular forces and how they affect the shape?

Alexis Robles 2k

What topics are going to be on Test 2?

Alexis Robles 2k

What were the two exceptions in the electron configuration?

Alexis Robles 2k

What is London on Dr. Lavelle slides?

Alexis Robles 2k

the definition for electronegativity is "the tendency of an atom to attract a shared pair of electrons towards itself". So, yes the higher the electronegativity in elements are more likely to get electrons.

Alexis Robles 2k

The higher the boiling point means the more energy is needed to break the intermolecular forces.

Alexis Robles 2k

Test 2 will cover material after the midterm and will be during week 8 in your discussion.

Alexis Robles 2k

Is black body radiation going to be on the midterm? If so, what do we exactly need to know?

Alexis Robles 2k

Can someone explain the octet rule? Thank you.

Alexis Robles 2k

For the midterm, we do not have to worry about the f-block correct?

Alexis Robles 2k

So we remove the electrons from the highest level block in the normal element configuration?

Alexis Robles 2k

Do we choose the one with the lowest electronegativity and ionization for the center?

Alexis Robles 2k

For week five homework, do we start the "Chemical bonds" list or can we still work on the "The Quantum World" list?

Alexis Robles 2k

Atomic Radii is basically ranked by electrons. So the more electron, the higher the atomic radii?

Alexis Robles 2k

Is Ml always -1/2 or 1/2 on the specific electron? For Ms, what does it mean -L to L

Alexis Robles 2k

For the midterm and future test, do you think we can write the electron configuration in the shorthand notation or do we have to write the whole thing?

Alexis Robles 2k

Can someone explain to me why 4s is lower energy level than 3d when there is only one electron on 4s.

Alexis Robles 2k

What is the full equation and its name that has "((hr/n^2)-(hr/n^2))?

Alexis Robles 2k

What did Dr. Lavelle mean when he said use "sin and cos" function in this slides

Alexis Robles 2k

Do we have to memorize the shell, subshells, and orbitals?

Alexis Robles 2k

What does the Quantum Number tell us? What is it used for?

Alexis Robles 2k

which equation do we use to find the Quantum Number?

Alexis Robles 2k

So in the periodic table, Oxygen molar mass is 15.999 but do we always just round it up to 16? or do we use 15.999 in certain problems?

Alexis Robles 2k

Can someone help me with how to solve this one?

Write the subshell notation (3d, for instance) and the number of orbitals having the following quantum numbers: (a) n=5,l=2;(b) n=1,l=0;(c) n=6,l=3;(d) n=2,l=1."

Alexis Robles 2k

Does Dr. Lavelle post his slides online in his website? Or is there a way to view them after the lecture?

Alexis Robles 2k

I was wondering when do we each equation? Do each equation solve for something different. I know they all are switched around but I'm just confused about which ones to use for certain questions?

E=hv
lambda*v=c
E=h*(c/lambda)
lambda=(hc/E)

Alexis Robles 2k

I was just wondering when do we use De Broglie equation? thanks

Alexis Robles 2k

So we get the molar mass from the periodic table Dr. Lavelle will give to us?

Alexis Robles 2k

What was the conversion from kelvin to Fahrenheit? I know it is a simple equation but didn't have time to write it down.

Alexis Robles 2k

I just wanted to make sure, is molar mass and atomic mass on the periodic table are the same.

Alexis Robles 2k

How do you know how many numbers to put in the final answer? Can someone explain this to me? Thank You

Alexis Robles 2k

What does Dr. Lavelle mean when he said: "submit homework on recently covered material." I thought we turn it in during discussion.

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