Chem Spring 2008 - page 17

Hi all, Hoping to start a Chem study group for Spring 2008. I do not begin class until January 15th but figured I would see about getting a group together as soon as possible.... Read More

  1. by   BusyMomof5
    Hi Maria!
    I wanted to post here and thank you for taking YOUR time to reply with so much helpful information. I have found this site to be such a breath of fresh air about human beings! :1luvu:
    So many of the members are helpful and take time out of their busy schedules to help others succeed in school! I LOVE IT! You will make an amazing nurse someday. I sent you a private message so you can check your message with a few other questions. Thank you again, and thanks to ALL the wonderful members who care about their peers!:redpinkhe
  2. by   AlishiaRN77
    Quote from Maria895
    Thank you from the bottom of my heart allieinaz!!! heartbeat First of all thank you for the encouragement - as a pre-nursing student its hard stay upbeat about even an A- so thank you! Secondly, your tips were amazing - my text book was soo confusing compared to this and my teacher wasn't really willing to explain anything. I'm going to print your tips out and study with them, so thank you so much!
    You are sooooo welcome! i'm glad that it made sense to you. Sometimes its hard to write on this when you need to use small numbers and symbols...etc..lol.

    Well, I just took my final tonight! I am DONE!! Woo hoo!!!!! 1 more final to go....tomorrow evening for Bio 181. I will be soo happy this weekend knowing that i'm done with these two classes!
    I will post as soon as I get my final grades.

    Hang in there everyone!!!!



    Busymom
    If you get a chance...look thru the entire chem spring 2008 section. I have typed out notes to make it easier to learn some of the topics for chemistry.
    the Z scale for understanding conversions from Kilo to deci...etc.

    How to do conversions from mol to mol, mass to mass, mass to g, etc.

    and a few other notes. Hope it helps out and good luck to you in fall.
    :typing
  3. by   BusyMomof5
    Ok this is too funny! This morning I searched through this entire Thread for all of your (Allie) posts and cut and pasted all of your Tips & hints into a Word document so when I start Chem in the Fall I will have them handy!!! I guess you could say we are on the same "wavelength"! I can only hope that I will be as successful as you and Maria have been in Chemistry!
    On another note, thank you very much for your positive words and encouragement. I feel SO incredibly BLESSED to have found this site. It gives me the confidence to know I can do it! You have no idea how much your words have helped me as I was very nervous and apprehensive about becoming a student after being a stay at home mom for the last 9 1/2 years. I was worried about being in the classroom with people as young as 16 years old but little by little I have realized that if I take one day at a time I, too, can be an A student and that if I believe in myself I can do anything. So thank you to all of you!redbeathe:redpinkhe
    Good luck to you on your Biology final !
  4. by   BusyMomof5
    A calculator question: is there one specifically that you would recommend? I don't have one and realized after reading thru the posts that I guess I'll need one for the fall when I'm braving Chem 101 ...figured I'd post the question to all of you now while this Thread is still near the top ! Thank you for your expertise!
    Oh, and I wanted to tell Allie that you will have no problems in Psych 101, which I believe you said you start on Monday. I'm taking it right now, it's very interesting but pretty easy. If you can get an A in Chem you'll barely have to work for it for psych. Good Luck!
  5. by   hearts895, RN BSN
    Quote from BusyMomof5
    Hi Maria!
    I wanted to post here and thank you for taking YOUR time to reply with so much helpful information. I have found this site to be such a breath of fresh air about human beings! :1luvu:
    So many of the members are helpful and take time out of their busy schedules to help others succeed in school! I LOVE IT! You will make an amazing nurse someday. I sent you a private message so you can check your message with a few other questions. Thank you again, and thanks to ALL the wonderful members who care about their peers!:redpinkhe


    Hi BusyMomof5! I'm SO glad I could help you! Going to BCC can be tough, so I'm glad I could help a fellow student out. I too have found this site to be one of the kindest, and most helpful sites I have ever found! Getting to know such kindhearted people like you and Allieinaz has been the highlight of my week! :1luvu::icon_hug: I'm sorry its taken me so long to get back to you! Thank you for your kind words - its great to know I'll be going into a profession where I'll be working with people as nice as yourself! I'm going to send you a private message back with my advice, so go ahead and check your messages. Don't worry about Chemistry - you can do it! Being a mom is the hardest and most important job of all - you're doing that and I have every confidence you can do well in Chemistry !! As far as calculators go I recommend the Texas Instruments TI-30X IIS 2-Line Scientific Calculator. Feel free to ask any more questions!

    Good luck on your Biology final Allieinaz and thanks again for all your help!
  6. by   AtomicWoman
    Quote from BusyMomof5
    A calculator question: is there one specifically that you would recommend? I don't have one and realized after reading thru the posts that I guess I'll need one for the fall when I'm braving Chem 101 ...figured I'd post the question to all of you now while this Thread is still near the top ! Thank you for your expertise!
    Oh, and I wanted to tell Allie that you will have no problems in Psych 101, which I believe you said you start on Monday. I'm taking it right now, it's very interesting but pretty easy. If you can get an A in Chem you'll barely have to work for it for psych. Good Luck!
    Yes -- after buying and trying several, I found I love the Casio fx-115MS. It is very intuitive, it has all the functions you'll need for Chem I, its display is easy to read, you can back up easily and correct inputting errors... I love it. And it was inexpensive. And it's solar/battery. And I got an A in both Intro Chem and Chem I! (I know, the calculator probably had nothing to do with it... LOL) Here's the link to Amazon's page for it:

    http://www.amazon.com/Casio-FX-115MS...0252611&sr=8-2

    Check for prices elsewhere; you may be able to get it cheaper at Wal-Mart or Staples.

    I *hated* the TI my school recommended for Chem I. I never could easily do exponents (which you'll use a lot in Chem, because of scientific notation) or square roots or logarithms. And the display on the TI I had was awful.

    Anyway, my 2 cents!
  7. by   AtomicWoman
    Quote from tiarageek
    I still have another month, my school's schedule is just bizarre.

    And right now I'm going crazy because I can't at all remember how to set up a problem to find the second temperature w/ Charles's Law. I'm just feeling completely stupid. Chem's just been "clicking" for me and now it's... not.
    For Charles' Law, the equation is always:

    V1/T1 = V2/T2

    The easiest thing to do when working with gas problems is to remember the COMBINED gas law, and then it doesn't matter whether you have a Charles' Law problem or Boyle's, or Ammonton's or Avagadro's. The Combined gas equation goes like this:

    V1 x P1 = V2 x P2
    ------- --------
    n1 x T1 n2 x T2

    (With the dashes representing the line between the numerator and the denominator.) If you know that equation, then you just cross out whatever variable(s) you don't need. So with a Charles' Law problem, the only two variables are volume and temperature, so you'd cross out the n on each side (number of moles) and the P on each side (Pressure), leaving you with just V1/T1 = V2/T2

    Once you have your equation set up, you have to isolate either V or T, depending on the wording of the problem. So to find V2, it becomes:

    V1 x T2 = V2
    -------
    T1

    Notice that T1 is still in the denominator, but T2 is now in the numerator due to the algebra you had to do to isolate V2. (You had to multiply both sides by T2 to get it out of the right-hand side.)

    Don't feel stupid, honey. I did great in Chem, but I did tons and tons of problems so that I felt really comfortable with each type.

    Here's a great website with lots of gas law problems for you to practice with:

    http://chemistry.alanearhart.org/Tut...aws/index.html

    Fabulous site; I could kiss that professor. Check out his other wonderful tutorials and quizzes. He saved my bacon when I was struggling with Lewis structures!

    (If you haven't done the Ideal Gas equation, PV = nRT yet, then don't click on his Ideal Gas problems, just do combined gas law problems.)

    Best of luck!
    Last edit by AtomicWoman on May 8, '08
  8. by   AlishiaRN77
    Ok, had to post really quick. I ended up being so tired last night that I went to bed at 8:45pm!! Good lord, I don't think I have ever gone to bed that early! LOL.

    Then getting up with the birds this morning! Is this what a morning is suppose to be??? LOL.

    Now i'm sitting here at my desk with my cup of coffee and about to start studing for my bio final that's tonight. Have to leave for work in a little bit but glad that i went to bed early to give me a little more time this morning to study.

    I can't believe the semester is going to be over by tonight....don't get me wrong..i'm glad its done but will truly miss the classmates i have met along the way.....

    Have a wonderful day everyone!
  9. by   AtomicWoman
    Quote from Maria895
    I have another month and a half left for Chemistry 101. Its a hard class and I'm really unhappy to tell you the truth - I was hoping for an A in the class but I can see now that I'll be lucky to get just an A- I was wondering what everyone else's grading scale is like for their Chem. 101 class? Mine is a 94 to get an A and 90 to get an A-. The tests are really hard because my teacher (she's nice but tough) asks all these abstract questions. Do any of you think this is a overly hard grading scale?
    Also, does anyone have any tips for memorizing the molecular and atomic geometric structures (tetrahedral, linear ect.) for each kind of atom and the whole polar/non-polar thing? I'm really confused!
    I guess all I can do is pray :bowingpur and hope for a decent grade. At least I'm transferring to a school with a 90 or above to get an A across the board-type grading scale (I hate the whole A- thing). Thanks for your thoughts everyone!
    Don't pray -- make flashcards! OK, pray AND make flashcards!

    Remember you first need to know the DOMAIN geometry and then you can figure out the MOLECULAR geometry. So a molecule with a tetrahedral domain geometry and no lone pairs of electrons will also have a tetrahedral MOLECULAR geometry, but a molecule with a tetrahedral domain geometry and one lone pair of electrons will have something different for the molecular geometry -- in this case, it will be trigonal pyramidal.

    So make yourself some flashcards, either with drawings or words. I made word flashcards that said something like this: 4 Domains [around the central atom], 1 Lone Pair: Domain Geometry = Tetrahedral Molecular Geometry = Trigonal pyramidal.

    Here's a website with some images (if you are more visually oriented) and quizzes (I am this guy's biggest fan):

    http://chemistry.alanearhart.org/Tut...ape-part1.html

    Just keep doing it; after a while you'll recognize patterns.

    As for polarity, there are a couple of simple rules (it's a bit more complicated than this, but this is usually enough to know for chem I):

    If there are 2, 3, 4, 5 or 6 (linear, trigonal planar, tetrahedral, trigonal bipyramidal or octahedral) atoms around the central atom AND all of the atoms surrounding the central atom are the same, then the molecule is NONPOLAR. All the dipoles cancel out.

    If the domain geometry is trigonal bipyramidal, but the molecular geometry is LINEAR, then it's also non-polar.

    If the domain geometry is octahedral, but the molecular geometry is SQUARE PLANAR, then it's also non-polar.

    Again, make yourself some flashcards. Mutter this stuff while you'll driving. Tell your SO over dinner. Pretty soon it will be comfortable for you.

    One trick profs often do is give you a molecule like CH3Cl. When you draw it, it is tetrahedral and you're tempted to say it's nonpolar. BUT notice that only 3 atoms around the C are the same; the 4th atom is a chlorine. Therefore, the dipoles do NOT cancel out and the molecular is POLAR.

    Always, always, always draw the Lewis structure. That will help you quickly realize that CH3Cl is polar. Also, you'll learn to recognize patterns. As soon as you see an O surrounded by 2 lone pairs, it will start to look like the pattern in the water molecule and you'll know it's polar because it's angular (or bent, depending on your prof's lingo). (This will work for other atoms, such as sulfur, too. That's one that you often see.

    Finally, remember that strings of hydrocarbons are always considered nonpolar. Always. So whether it's C3H3 or C20H20, or any other combination of Cs and Hs, hydrocarbon strings are always nonpolar. (The difference in their electronegativities is not 0, but it is small.) Again, draw a few of them and you'll see why.

    Good luck!
    Last edit by AtomicWoman on May 8, '08
  10. by   AtomicWoman
    Quote from allieinaz
    Ok, had to post really quick. I ended up being so tired last night that I went to bed at 8:45pm!! Good lord, I don't think I have ever gone to bed that early! LOL.

    Then getting up with the birds this morning! Is this what a morning is suppose to be??? LOL.

    Now i'm sitting here at my desk with my cup of coffee and about to start studing for my bio final that's tonight. Have to leave for work in a little bit but glad that i went to bed early to give me a little more time this morning to study.

    I can't believe the semester is going to be over by tonight....don't get me wrong..i'm glad its done but will truly miss the classmates i have met along the way.....

    Have a wonderful day everyone!
    I was so tired after my Chem final that I took a nap! I never nap!! But boy, I needed it. Good luck on the bio final!
  11. by   BusyMomof5
    good luck tonight on your final, allie!
    i was exhausted after taking my psychology mid-term on friday. i felt weak and tired! i wish i could have taken a nap! i think studying that hard takes a lot of brain work and it's tiring...now i know why my little ones can be so cranky when they come home from elementary and preschool. :redpinkhe
  12. by   AlishiaRN77
    Quote from loris
    i was so tired after my chem final that i took a nap! i never nap!! but boy, i needed it. good luck on the bio final!
    thank you lori! i just got done with my bio final and my teacher went ahead and corrected your exam while you waited. i got a 94% on my bio final. then she gave me my final grade....i hate to wait so i was really glad that she gave me my grade.

    i got an a for bio yeah!

    Quote from busymomof5
    good luck tonight on your final, allie!
    i was exhausted after taking my psychology mid-term on friday. i felt weak and tired! i wish i could have taken a nap! i think studying that hard takes a lot of brain work and it's tiring...now i know why my little ones can be so cranky when they come home from elementary and preschool. :redpinkhe
    i so know what you mean busymom....right before class i took a 15 minute catnap. it really helped me with the test. i felt refreshed.

    here are my final grades......

    chem lecture: 99% - a
    chem lab: 100% - a
    bio lec/lab: 95% - a

    woo hoo!!!
  13. by   BusyMomof5
    Allie!
    You must be so proud! Too bad you don't live closer, I'd hire you to tutor me Fall quarter.
    Enjoy your break!

close