Chemistry 2006/ 2007 Club***

WannaBTraveling · Nov 1, 2006

hi everyone,

i am taking chemistry in the winter term of 2007 or the spring term of 2007 depending on the availability at my school. i was talking to the chemistry instructor and his advice was to begin reading and memorizing the periodic table prior to taking the class. know what the elements are and what their abbreviations are, and what class they are in. i have started doing this, so i read through this entire 24+ page forum and pulled together all the websites and book recommendations for us new to this forum. i thought it would be easier if all the info were in one place because good information is great to have all in one central location!

please remember - i am not plagiarizing anyone - all websites and books that are listed below came directly from this forum -

http://chemed.chem.purdue.edu/genche..._noframes.html

http://dbhs.wvusd.k12.ca.us/webdocs/chemteamindex.html

http://chemistry.about.com/library/weekly/aa081301a.htm

http://ehs.vail.k12.az.us/~frankm/chemistry.html

http://chemqueen.com

www.chemfiesta.com

http://education.yahoo.com/reference...ry/metrictable

http://antoine.frostburg.edu/chem/se...01/index.shtml

http://science.widener.edu/~svanbram/ptable.html

http://www.google.com/help/features.html#calculator

http://www.theodoregray.com/periodictable/

to memorize anything you can use a mnemonic (or make your own) just do a search for "chemistry mnemonics" or check these out:

http://www.medicalmnemonics.com/

http://www.xs4all.nl/~jcdverha/scijo....html#subindex

recommended readings:

"complete idiot guide to chemistry" (orange book)

"chemistry for dummies" (yellow book)

"the cartoon guide to chemistry" by larry gonick & craig criddle. (its on amazon new or used) i

i hope this helps!! thanks to everyone who contributes to this wonderfully informative forum!!!

tofutti · Nov 1, 2006

Anyone who reads ahead will be glad they did!

But don't scare yourself or try to master too much from too many different places.

My advice would be to pick one or two resources from these awesome lists and focus on that. Or just get any good chem book and read chapter one and two.

Definitely helps to hit the ground running.

Tofutti

catzy5 · Nov 1, 2006

Anyone who reads ahead will be glad they did!
But don't scare yourself or try to master too much from too many different places.
My advice would be to pick one or two resources from these awesome lists and focus on that. Or just get any good chem book and read chapter one and two.
Definitely helps to hit the ground running.

Tofutti

I agree! Better yet get the book that is chosen for your particular course and sometimes they have the syllabus online, my course actually has the whole semester lecture notes. This way you know exactly what you will need to know.

I have found there are so many levels of chemistry, We are required to take a basic chem class in order to get into Microbiology, looking at many links of Chemistry would only confuse me. However I definitely say save them to use when you get stuck on things. Also the dummy books are an excellent introduction, just learning the vocabulary of a subject can really help.

I have found Chemistry not nearly as difficult as I thought it would be.

catzy5 · Nov 2, 2006

I know I should not be upset but I just got the results of my 3rd exam I got an 88 I am dissapointed in that grade only because this instructor makes it impossilbe for anyone to do well. He does grade on a curve but still when you put so much work into something you want to feel like you have learned something. The class average for this test is a 58% all smester long I think the highest average was a 67%. I don't mind working for my grades and I apprectiate a course that challanges me but this is not a challange its just a way of figuring out what kind of ridiculious questions he is going to ask to try and stump you.

miranda819, BSN · Nov 3, 2006

I'm having some trouble setting up a problem I was assigned for homework (but we have yet to go over how to do it in class!). I was so tangled and confused yesterday that I vowed to drop chem and retake it next semester. But, I slept on that and started fresh today and things are looking much better. Now I need help with my very last homework problem...please help.

The problem states:

A concentrated nitric acid solution contains 35% HNO3. How would you prepare 300 mL of 4.5% solution?

This is how I set it up, but I'm not sure I'm even headed in the right direction:

45g HNO3/.3 L x 1 mol HNO3/63g HNO3 = 2.38 M

but does this answer the question??? I'm confused

Thanks for the help!

Miranda

Nurse's_Heart · Nov 6, 2006

anyone taking chemistry in spring 2007?

I will be taking Chemistry in Spring 2007. It's been years since I've looked at anything having to do with Chemistry. Hopefully with each other's support and encouragement we can all pass!

leximast1 · Nov 9, 2006

Hi Miranda,

We are covering the same problems in my Chem 101 class. It believe you use C1,V1 = C2,V2 . So C1 = 4.5%, V1 = 300ml and C2 = 35%

4.5% x 300ml = 35% x V2 Divid both sides by 35% to get V2 by itself and V2 is 18.6 ml. So the answer is

Take 18.6ml of the 35% HNO3 and add H2O until you have 300ml of solution.

That should be correct.

Good luck lexie

Miss Chybil RN, BSN, RN · Nov 12, 2006

I'm having trouble setting up this problem because what I am trying to find is in the denominator. I'm not sure what to invert, if anything, to solve.

What is the initial temperature (Celcius) of a system that has the pressure decreased by 10 times while the volume increased by 5 times with a final temperature of 150 K.

This is what I have so far...

P1 = 1 atm

V1 = 1.0 L

T1 = (find)

P2 = -10 atm

V2 = 5.0 L

T2 = 150 K

(1 atm)(1.0 L)/ T1 = (-10 atm)(5.0 L)/ 150 K

T1 = (This is where I get lost. I don't know what to put in the numerator and what to put in the denominator. Don't I need to invert something, or is it different since I'm starting with the unknown in the denominator? All the problems in the book have the unknown in the numerator.)

Thanks for your help.

abrainerd · Nov 14, 2006

Normally I know this stuff but it does not seem to work correctly in this case. Based on the way you have this set up, you just invert the items to the opposite side, i.e. (-10 atm) divided by (1 atm) times (5.0 L) divided by (1.0 L) times 150 divided by 1 making the answer come to 7500 K. That answer just does not seem correct. You might want to double check with a class mate on this one if you haven't already. Sorry I couldn't be of more help.

Miss Chybil RN, BSN, RN · Nov 14, 2006

Normally I know this stuff but it does not seem to work correctly in this case. Based on the way you have this set up, you just invert the items to the opposite side, i.e. (-10 atm) divided by (1 atm) times (5.0 L) divided by (1.0 L) times 150 divided by 1 making the answer come to 7500 K. That answer just does not seem correct. You might want to double check with a class mate on this one if you haven't already. Sorry I couldn't be of more help.

I’m sorry I didn’t put this in my original post, but the answer to the problem is 27 degrees Celsius. This is on our exam study guide. I just don’t know how to get that answer. (One thing to remember is you must work the problem with all temps in Kelvin, then convert the answer back to Celsius.)

The formula for this type of problem is:

(P1)(V1) / (T1) = (P2)(V2) / (T2)

If I were looking for V2, I would set up the problem like this:

V2 = (P1) (V1) (T2) / (P2) (T2)

But, as you notice in the problem I posted, the unknown is in the denominator and this is throwing me all out of whack. My brain is just drawing a blank on the whole thing. It's been awhile since I was in math class.

Thanks so much for trying. I hope this will help you help me figure it out!

catzy5 · Nov 14, 2006

I'm having trouble setting up this problem because what I am trying to find is in the denominator. I'm not sure what to invert, if anything, to solve.
What is the initial temperature (Celcius) of a system that has the pressure decreased by 10 times while the volume increased by 5 times with a final temperature of 150 K.
This is what I have so far...
P1 = 1 atm
V1 = 1.0 L
T1 = (find)
P2 = -10 atm
V2 = 5.0 L
T2 = 150 K
(1 atm)(1.0 L)/ T1 = (-10 atm)(5.0 L)/ 150 K
T1 = (This is where I get lost. I don't know what to put in the numerator and what to put in the denominator. Don't I need to invert something, or is it different since I'm starting with the unknown in the denominator? All the problems in the book have the unknown in the numerator.)
Thanks for your help.

I am looking at this and seeing something a little different I am not sure if I am correct or not but I would think you would use the "combined gas law"

P1 X V1 /T1 =P2 X V2/T2 rearange to solve for T1 you get

T1 = T2 XP1X V1/P2 X V2....

so my equation would look like this

(1atm)(150K)(1.0L)/(-10atm)(5.0L)

Units cancel leaving Kalvin as the units identifying T1 as -3K

Miss Chybil RN, BSN, RN · Nov 14, 2006

I am looking at this and seeing something a little different I am not sure if I am correct or not but I would think you would use the "combined gas law"
P1 X V1 /T1 =P2 X V2/T2 rearange to solve for T1 you get
T1 = T2 XP1X V1/P2 X V2....
so my equation would look like this
(1atm)(150K)(1.0L)/(-10atm)(5.0L)
Units cancel leaving Kalvin as the units identifying T1 as -3K

Hi,

Thanks for giving it a shot. I just posted above, the answer is 27 degrees Celcius. So, T1 - 273, must equal 27. I just don't know how to get it. How do you know how to rearrange?