23 thoughts on “Review Session 2”

  2. Balazs Martai

    Just adding onto Justine’s statement…
    The number of protons will not change, only the number of electrons. That being said, I think your question had to do something with how the electrons go into the orbitals. Ions lose electrons from the highest n-subshells.

    Also, if you have, for example, Chromium (Cr), whose valence electron configuration is [Ar]4s2 3d4, you’d think that the “boxes” that get filled up are 2 in the s orbital, and 1 per box in the d orbital, leaving one of them completely empty. However, it will want to form a more stable half-full shell, which has 1 electron in the s orbital, and 1 in each of the d orbital boxes, giving you 5 there.

  3. Justine Downing

    Hey Lauren,
    To find out how many electrons are in Ca (or in any element for that matter) you would look at the atomic number= number of protons and that will give you the number of electrons, so for Ca its 20. If it is a cation or anion the number of elcetron will change for instance if its Ca2+ there will only be 18 electrons.

    I hope that helps!

  4. Laura Risch

    I was wondering if anyone could explain how you determine the number of electrons used to fill up orbitals for a specific element. For example. If we were asked to write the electron configuration for Ca, how would I find the number of electrons?

    Thanks so much

  5. Anne Papacostas

    Hi Stephanie,
    the specific heat capacity equation is q=m *Csp*T if you are in units of grams or q=n*Cn*T if you are in units of moles.
    q =Energy in Joules
    m=mass of substance
    n=moles of substance
    T=(Tfinal – Tinitial)

    The owl section for specific heat is around 5.2, so if you want to practice some problems, go to past due assignments and look in that section and the ones around it.

  6. Stephanie Bruno

    Does anybody know where I can find a specific heat capacity equation? Like for problem #8 on the practice exam, or problem 7 from Tuesday’s SI worksheet?

  7. Stephanie Bruno

    If you mean a set of quantum numbers such as what the Pauli Exclusion principle talks about then you can find a really good explanation in the e-book on page305. I didn’t understand that at first either but I thought that the explanation in the book helped me out, hope it works for you too.

  8. Robert Kane

    I meant to ask at the review session today, but can someone please explain what a “set of quantum numbers” means. An example for where this is used is question 25 on the practice exam.

    thanks,
    Robert Kane

  10. Connie Diep

    I just wanted to make sure for extra credit on Exams

    Answering 2 questions on a blog gives you 4 extra points on the exam?

    or…

    Asking 4 questions on a blog give you 4 extra points on the exam?

    or you can do a mix of answering 1 question and asking 2 questions, right?

  11. Shaheen Hakim

    Brittany,

    Professor Knapp suggested we over the follwing sections of the book:
    Ch 3.9, Ch 5, Ch 6, Ch 7, the interchapter and then the bit of reading from chapter 21. Its about 8 pages from chapter 21 and its on the homepage.

    Shaheen Hakimi

  12. Robert Kane

    Professor, could you please record this extra help session so we can review it again tomorrow?

    Thanks,
    Rob Kane

  13. Brittany Bausch

    Hey everyone I don’t have a question but i have a suggestion. on pages 241-242 and pages 296 it contains equations we will need for this exam. These pages really helped me do the practice test.

    I do have a question, does anyone know what questions Prof. Knapp suggested for us to go over for this exam?

    Thank You,
    Brittany Bausch

  14. Christina Dube

    Alison,
    Last review session, we went over any questions that students had (you had to bring in an example problem of some sort) and we did go over the practice test if people had problems with certain questions. I found it very useful!

  16. Dan B

    Hey, I was wondering how much on redox reactions are going to be on the exam? I don’t feel like I know them as well as I should.

    If is going to be on the exam can we go over them in this review?

    Thanks!

  17. Justine Downing

    Aimee,
    Yes there is a practice exam for exam 2 it is under the tab up top that says EXAMS. Then you would scroll down to the Midterm 2 Exam section and see a link for Practice Exam 2
    Hope That helps =)

  22. Brittany Bausch

    Hello Andrew,
    In the syllabus it says that owls count for 60 points approximately 10% of our grades, but he drops 10% of the models.

    Brittany Bausch

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