[tlaspires2rn]

Thanks Allieinaz. Good luck Kristi1111. If anyone knows any tricks/hints/shortcuts, etc. for nomenclature I'm all ears. It's killing me. Naming formulas is tough. Especially remembering the polyatomics! My professor has no mercy and expects us to memorize EVERYTHING! My first exam is Thursday afternoon and I'm freaking out here.

[itsa307]

I had my first quiz tonite and I bombed! I feel soo stupid but I know I just need to study harder. I need a better plan. It was 5 questions - 3pt each - in 15 minutes. I know I only got 2 out of the 5 right. I made 2 dumb mistakes because of test aniexty and another was equations and I knew all the info but couldn't come up with the formula. I think if I had a little more time I would've figured out the 2 after going over them again. And when I called my dh he was soo unsupportive. I told him I needed to find some more time to study and his response was "good luck with that." I've been studying often but I think I need some more length. Like a block of studying on Sun or Sat. I'll have to figure out something with the housework, kids, and job. The thought even crossed my mind to quit my p/t job but we need the $.....

[Gurmo]

Howdy all. My gf is taking Chem and is struggling and I can't bare to see her like thisth this. I've read thru this entire thread and was wondering if anyone else can recommend something that I or she can do to help. So far it looks as if the best things include the Cliff Study Solver and these two links:

Originally Posted by allieinaz

Hey all,
I found another great site that is free for Chemistry help.
http://www.cramster.com/

It doesn't have my book listed but there are others on there that have asked conversion questions, etc.

Originally Posted by NXS

Great website to refresh on chemistry concepts, good easy method of explaining each key concepts and includes examples and such. I used it few years back but i think it'll help.
http://www.chemreview.net

Oh and the use of the Z (I'm going to keep that for myself too, pretty handy!).

Can anyone else recommend something that may help her? I'm going to forward these things to her but was hoping for more stuff!

Good luck to you all!

[allieinaz]

Originally Posted by tlaspires2rn

Thanks Allieinaz. Good luck Kristi1111. If anyone knows any tricks/hints/shortcuts, etc. for nomenclature I'm all ears. It's killing me. Naming formulas is tough. Especially remembering the polyatomics! My professor has no mercy and expects us to memorize EVERYTHING! My first exam is Thursday afternoon and I'm freaking out here.

You are very welcome tlaspires2rn. I hope it helped. We are starting on nomenclature as well, so lets definitely help one another out. I'm going to include this part that i just read in the cliff study solver...i'm not sure how far you are into nomenclature but maybe it will help.

rule 1: The names of all binary compounds end in "ide" For example: carbon disulfide - CS2

rule 2: The elements are named in the order they appear in the formula, left to right.

rule 3: The number of atoms of exach element is indicated using numerical prefixes - 1=mono, 2=di, 3=tri, etc.

If you get a chance, stop by one of the book stores - Borders, Barnes and Noble, and flip through this study solver. Chapter 4 in the Cliff's study solver goes over nomenclature and they appear to explain it pretty easily.

Hope it helps.

Originally Posted by itsa307

I had my first quiz tonite and I bombed! I feel soo stupid but I know I just need to study harder. I need a better plan. It was 5 questions - 3pt each - in 15 minutes. I know I only got 2 out of the 5 right. I made 2 dumb mistakes because of test aniexty and another was equations and I knew all the info but couldn't come up with the formula. I think if I had a little more time I would've figured out the 2 after going over them again. And when I called my dh he was soo unsupportive. I told him I needed to find some more time to study and his response was "good luck with that." I've been studying often but I think I need some more length. Like a block of studying on Sun or Sat. I'll have to figure out something with the housework, kids, and job. The thought even crossed my mind to quit my p/t job but we need the $.....

Hang in there itsa.....it's only the first quiz. I'm sorry that dh didn't support you with a response that you really needed at the time. Here's a thought but i don't know if it would work for you...have you tried to study at night when the kids have gone off to bed? There are some parents in different forums that have talked about doing this and it appears to be working for them. I actually work nights - 8pm to 8am and i'm able to study and retain pretty well...hope you'll be able to find a way to make it work for you.

Originally Posted by Gurmo

Howdy all. My gf is taking Chem and is struggling and I can't bare to see her like thisth this. I've read thru this entire thread and was wondering if anyone else can recommend something that I or she can do to help.

Oh and the use of the Z (I'm going to keep that for myself too, pretty handy!).

Can anyone else recommend something that may help her? I'm going to forward these things to her but was hoping for more stuff!

Good luck to you all!

I hope the study solver will help. Here's another site that might help...

http://www.mychemistrytutor.com/forums/index.php

Keep reading the posts on here. As I go through the class, i'll post things that my instructor gives us. She's really good at teaching and makes this class VERY bearable and entertaining. I'm actually liking my chemistry class better than my biology class...lol. Who knew???!!



I had my chem class last night but she didn't have our tests graded yet so I don't know what i got.....sooo bummed...
I really want to know how I did...ugh....guess i'll have to wait and see if she will have them ready for Wednesday....crossing fingers.
Have a great day everyone!

[Hanabna]

I need help! This is so confusing!

Q.) Using your knowledge of physical changes, you can separate the components of a mixture. If you had a mixture consisting of table salt (sodium chloride), sand (silicon dioxide) and ammonium chloride (NH4Cl), work out an experimental method that would separate each component while measuring their masses directly or indirectly. Use these properties of the components to help you plan:

Table Salt: Melting point: 801 degrees C; Solubility: 35 g will disolve in 100 g water at 100 degrees C.

Sand: Melting point: 1600 degrees C; Does not dissolve in water (insoluble).

Ammonium chloride: Sublimes at 350 degrees C; Does not melt, Solubility of 37 g in 100 g H2O at 100 degrees C.

[allieinaz]

Originally Posted by Hanabna

I need help! This is so confusing!

Q.) Using your knowledge of physical changes, you can separate the components of a mixture. If you had a mixture consisting of table salt (sodium chloride), sand (silicon dioxide) and ammonium chloride (NH4Cl), work out an experimental method that would separate each component while measuring their masses directly or indirectly. Use these properties of the components to help you plan:

Table Salt: Melting point: 801 degrees C; Solubility: 35 g will disolve in 100 g water at 100 degrees C.

Sand: Melting point: 1600 degrees C; Does not dissolve in water (insoluble).

Ammonium chloride: Sublimes at 350 degrees C; Does not melt, Solubility of 37 g in 100 g H2O at 100 degrees C.

Hopefully I'm understanding the question correctly......here's my shot at it...not sure if it's right though...

1. When you look at all three substances within the mixture, you'll notice that 2 of the 3 have melting points......2/3 have solubility....

I would first place the mixture in 100g of water and heat to 100 degrees C to separate the sand from the mixture.
This will separate the sand without affecting the physcial state of the sand.


2. I would then heat the water mixture that contains the NH4Cl and table salt. Knowing that NH4Cl goes from solid to gas (sublimination), you'll need to be able to catch the gas (this one is a tough one..lol).
I would think that with NH4Cl subliminates at 350 degrees you should be able to get the volume then be able to find the mass of NH4Cl of the mixture.....hmmmm.......
Table salt has ionic bonds, thus if you continue to heat it all the way through, the end result will be the cotents of table salt.

I have no idea if this even made any sense. That's a tough question that your teacher has you guys answering......at least i think it a tough on....

Anyone else out there have an answer?

[allieinaz]

Hey all!
So, I finally got my test back...i'm happy to report.....

Chem exam 1: 92% - Found out tonight, 2/11/08, that my instructor miscalculated....i actually got a 94% Woo hoo!!!

Bio exam 1: 96%

[PadawanLearner]

Originally Posted by allieinaz

Hey all!
So, I finally got my test back...i'm happy to report.....

Chem exam 1: 92%

Bio exam 1: 96%

Congrats!!

I'm actually enjoying chemistry. Studying last night gave me a headache though. All that _ide, _ate, _ite stuff is not gray matter friendly. Had to take a break and watch an episode of "Emergency!" (I'll memorize all these poly ionic compounds as long as I don't have to wear that stupid nurse's hat when I graduate lol)

I think the only thing that's truly frustrating is having an instructor who can't spell, can't do math, and who doesn't proof-read before handing out/posting assignments. One question cracked me up: How much of a given sample is left after 40 hours if the half life of the given sample's isotope is 12 years? Okay, I can do the math, no problem. Ohhh, she meant the half-life was 12 hours. Tiny bit of difference there.

[allieinaz]

Originally Posted by C8H10N4O2

Congrats!!

I'm actually enjoying chemistry. Studying last night gave me a headache though. All that _ide, _ate, _ite stuff is not gray matter friendly. Had to take a break and watch an episode of "Emergency!" (I'll memorize all these poly ionic compounds as long as I don't have to wear that stupid nurse's hat when I graduate lol)

I think the only thing that's truly frustrating is having an instructor who can't spell, can't do math, and who doesn't proof-read before handing out/posting assignments. One question cracked me up: How much of a given sample is left after 40 hours if the half life of the given sample's isotope is 12 years? Okay, I can do the math, no problem. Ohhh, she meant the half-life was 12 hours. Tiny bit of difference there.

lol....at least she's not typing out or writing out her coversations while lecturing in class....lol but i've got the same sometimes.

The instructor is great...by far the best i've had in all the years of schooling....but can definitely tell when she's getting tired. She's talking about something completely off subject while writing on the board for our lecture and right when she thought she was done, she looks over at what she wrote on the board and realized that she wrote out her entire conversation...LMAO!

But with assignments..helllllllo!!! They should be right...perhaps she has the same problem my instructor has?? lol.

Thank you for the congrats! I'm really happy and excited..now lets see if I can keep it up!

[altbsn2010]

Originally Posted by C8H10N4O2

I think the only thing that's truly frustrating is having an instructor who can't spell, can't do math, and who doesn't proof-read before handing out/posting assignments. One question cracked me up: How much of a given sample is left after 40 hours if the half life of the given sample's isotope is 12 years? Okay, I can do the math, no problem. Ohhh, she meant the half-life was 12 hours. Tiny bit of difference there.

Ha! That sounds like my instructor.

We had our first Chemistry test last night, and there were several typos and mistakes on it. Crazy! On assignments it's one thing, but on the test. Ridiculous.

It's okay, though. I think I did pretty well on the first test. The first for a new instructor is always the worst, because you don't know what to expect. There were a couple of questions that I wasn't sure about, and one where I just didn't have a clue and so I had to guess - something about enthalpy - but for the most part, I feel pretty good about it. Guess I'll find out next week when we get the test back.