CHEMISTRY COMMUNITY

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when do test 2 results come out

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do we have hw due week 10?

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for me a good self care break helps calm the nerves

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This is great hearing what med school is actually like!!

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Congrats!!

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Ethene is a component of natural gas, and its combustion has been thoroughly studied. At a certain temperature and pressure, the unique rate of the combustion reaction C2H4(g)1 3 O2(g) S 2 CO2(g) 1 2 H2O(g) is 0.44 mol?L21 ?s21. (a) What is the rate at which oxygen reacts? (b) What is the rate of fo...

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7A.1 Complete the following statements relating to the production of ammonia by the Haber process, for which the overall reaction is N2(g) 1 3 H2(g) S 2 NH3(g). (a) The rate of consumption of N2 is ______________ times the rate of consumption of H2. (b) The rate of formation of NH3 is ______________...

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For the 5 posts every week on chem community, is it a hard deadline every week or is it more general like if you have 50 posts overall at the end?

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what topics can we do for test 9?

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how much is test 2 worth for your overall grade (is it weighted higher than test 1?)

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Is test 2 cumulative?
What topics is it on

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Does anyone have good thermo study techniques? Or the best resource to help study it?

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Does anyone have an old (or recent) chem 14b study guide that’s been passed down to them?

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What topics can we do for hw 8

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Did test 2 get moved to week 9?

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What’s the best way to study for chem 14b

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What’s the difference between isolated and closed systems

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When is work positive/negative

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Is test 2 going to be cumulative

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What sections should we do for HW7

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Calculate the standard reaction entropy, enthalpy, and Gibbs free energy for each of the following reactions from data in Appendix 2A: (a) the decomposition of hydrogen peroxide: 2 H2O2(l) ¡ 2 H2O(l) 1 O2(g)

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Write a balanced chemical equation for the formation reaction of (a) NH3(g); (b) H2O(g); (c) CO(g); (d) NO2(g). For each reaction, determine DH8, DS, and DG from data in Appendix 2A.

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can someone help with this question from the homework please:

Calculate the change in molar Gibbs free energy for the process NH3(l) S NH3(g) at 1 atm and (a) 215.0 8C; (b) 245. 8C (see Tables 4C.1 and 4F.1). In each case, indicate whether vaporization would be spontaneous.

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Why are so many exothermic reactions spontaneous?

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what time is the midterm on Wednesday? Is it during class or later in the day like 14A?

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there's no topic 5 on the midterm

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you can also access a lot of free pdf versions of textbooks here:

https://b-ok.org

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for anyone that's been, have you found them helpful/how is the pace of the step-up sessions

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is there anywhere where lavelle posts his slides/lectures?

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which topics should we do the homework from

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what topics will the midterm cover/ is it cumulative or just the stuff since test 1

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when do we get the test 1 results

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what date/time is the midterm?

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what's the difference between a bronsted acid and a lewis acid

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can someone explain this question please 6A.3 Write the chemical equations for the proton transfer equilibria of the following acids in aqueous solution and identify the conjugate acid–base pairs in each case: (a) H2SO4; (b) C6H5NH3 1, anilinium ion; (c) H2PO4 2; (d) HCOOH, formic acid; (e) NH2NH3 1...

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are the midterms/tests and final cumulative?

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What are the topics for test 1?

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when is test 1?

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our homeworks are graded on completion, not correctness, right?

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can someone help me with this homework question 5G.9 A sample of ozone, O3, amounting to 0.10 mol, is placed in a sealed container of volume 1.0 L and the reaction 2 O3(g) S 3 O2(g) is allowed to reach equilibrium. Then 0.50 mol O3 is placed in a second container of volume 1.0 L at the same temperat...

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which topics is test 1 on

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are we still just doing chemical equilibrium questions for homework 2?

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how did everyone find the final?

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whats a heme group

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does anyone know how the grading is going to work- will there be a curve/how curved?

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does anyone know when the final grades are going to be posted?

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Dr. Lavelle, Thank you so much for such a great quarter! Your lectutres are always both very informative but also hilarious. I have thoroughly enjoyed this class, and having not taken chem since sophmore year of high school, I now feel like I'm finally getting back into it. Can't wait to take 14B wi...

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Can someone explain what a ligand is

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You don’t have to write the 1 but if you prefer to then you can

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Does anyone know if he’s going to curve the class

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Does anyone know what the week 9 HW topics are?

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Does anyone know when the test two grades will be posted

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Are we going to have to draw out the molecules?

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can someone briefly explain VSEPR

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are step-up sessions different to the other sessions?

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What topics can we do questions from for the week 8 HW

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do you know what topics the test will cover?

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Does anyone know when test 2 is going to be?

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does anyone know if theres gonna be a study guide that he gives us?

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this might have already been answered but does anyone know if he posts the lecture slides and if so where?

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single bonds are longer because there is less attraction to the nuclei, whereas double bonds have a greater pull and thus are pulled closer making them shorter

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What sections can we do questions from for the homework this week

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thanks guys!

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so are we going to have class like normal on wednesday?

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There is only one midterm right?

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can anyone help with this question: (a) How many values of the quantum number l are possible when n 5 7? (b) How many values of ml are allowed for an electron in a 6d-subshell? (c) How many values of ml are allowed for an electron in a 3p-subshell? (d) How many subshells are there in the shell with ...

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can someone help me with this question:

How many orbitals are in subshells with l equal to (a) 0; (b) 2; (c) 1; (d) 3?

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I thought we had done a little bit on chemical bonds, but maybe I'm wrong?

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Does anyone know if we are going to have to be able to physically draw the different shells or if we just need to know their different energy levels?

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does anyone know what topics we can do for HW 4?

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I bought my e-textbook as a rental on Amazon, if you download the kindle app this might be a good resource :)

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Does anyone know any good, concise youtube channels that cover the topics on the 14 series that would be useful for studying/brushing up on all of the material?

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Does anyone know when the midterm will be and what the layout/structure of it will be like (how many questions, what topics etc)?

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What is a multi-electron atom, don't all atoms have multiple electrons except for H?

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how do you know which element to put in the square brackets when writing out the configurations, for example:

Sc is [Ar] 3d^1 4s^2

how do you decide that Argon goes in the brackets?

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Normally I try to use the same amount of significant figures as the question in my answer, but sometimes the question has different amounts of significant figures for different values/measurements, so i was just wondering if there's a standard that Lavelle has for sig figs and how many that would be?

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it's definitely best to start with the least occuring element and go from there, but also if you ever want to check your work you can use this helpful website:

http://www.endmemo.com/chem/balancer.php

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I was struggling with this question during the homework, can anyone help? 1A.15 In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral ...

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can someone help explain how you would do this question: 1A.11 In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series (for example, Balmer series or Lyman series, as shown in Fig. 1A.10). What is common to the lines within a series that makes gro...

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Yes for example when converting from 1 angstrom which is 1*10^-10m to mm you would multiply by 10^3 which would give you 10^-7

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You could always write in pencil and go over in pen just to be safe too!

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Also if you ever need to check your equations are correct you can use this helpful website:

http://www.endmemo.com/chem/balancer.php

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Is there an easy way to know how many atoms should be in each formula?

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a useful tool to help check if you're correct is:

http://www.endmemo.com/chem/balancer.php

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for part c) Mg(N3)2(s) + H2O(l) = Mg(OH)2(aq) + NH3(aq)

I kept trying to balance but I couldn't figure it out, can anyone help?

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