***Chemistry - Fall 2005***

I just found a site where there are worksheets to download, etc., but I'm not sure there are answers to them.

BUT.......I did find some useful info:

For memorizing polyatomic ions, in order to remember if it is supposed to be -ite or -ate, remember this rule:

http://www.sartep.com/chemistryx/worksheets/pdfs/4_02.pdf

I am new to "allnurses" and this is my first posting. I am hoping to apply for a RN or LPN program in a couple of years. After being out of college for 12 years I am a bit intimidated. I start Chem 121 this quarter fall 2005. I have no clue what a "sticky" is but it looks like people want one. I would love to stay in contact with people doing chem. I am also trying to raise a 2-year-old while attending college. Call me crazy! I took Psychology of human dev'p last quarter and loved it!

Welcome to Allnurses.com!

A sticky is just a thread that will stay at the top of all the threads. Those without stickies will eventually be bumped off the first page as new threads are started.

Good luck with your education! :)

I am new to "allnurses" and this is my first posting. I am hoping to apply for a RN or LPN program in a couple of years. After being out of college for 12 years I am a bit intimidated. I start Chem 121 this quarter fall 2005. I have no clue what a "sticky" is but it looks like people want one. I would love to stay in contact with people doing chem. I am also trying to raise a 2-year-old while attending college. Call me crazy! I took Psychology of human dev'p last quarter and loved it!

Ok, someone needs to learn me something...LOL

CuMnO4

Is it Copper Monomanganese tetraoxide, I'm thinking not.

Is it something totally different? The three elements are confusing me.

Copper and Manganese are transitional metals, and Oxygen is 2-.

And another:

RhSiO3

Rh is Rhodium, a transition metal.

Si is +/- 4

O is -2

And yet another question:

For compounds such as In2S3 is it:

diindium trisulfide

or

indium trisulfide

or

indium sulfide

AND.....how do you know whether or not to use the prefixes mono, di, tri, tetra, penta, hexa, hecto, octo, nano, or deca? I know beginning ones do not need mono, but the others are confusing me.

Are you suppose to use them all the time, or for an exact cross over such as In2S3, do you just use Indium Sulfide. (Indium is +3, and Sulfur is -2)

Thanks a bunch to anyone that can help!! :)

hi,

CuMnO4 is COPPER PERMANGANATE

the MnO4 is regarded as one and has oxidation # of -1, copper has two possible oxidatn # +2 and +1. in this case it is Cu one but the one can be dropped. so the formula is named as above. hope it helps I am working on my homework right now. so i'm still up.

The RhSiO3 i'm not sure of

ADDITION

to make it easier make use of a well laid out periodic table.

identify the metals and non metals. metals aree to the right of a thick line drawn on the table and non metals to the right of this line.

then u start with say compounds that have only two elements

e.g

1.CaCl2....... calcium chloride; CuCl2...... Copper 2 chloride; notice the 2 element are M and NM;

2. CO...... carbon monoxide; NO....nitrogen monoxide; N2O3.....Dinitrogen trioxide

notice that thses compounds contain 2 NM.

this is as far as i can go for now but u still have comp. having more than two elements. along the line as usual in chem there are a few where the rule is broken.

hope i make a little sense

Ok, someone needs to learn me something...LOL

CuMnO4

Is it Copper Monomanganese tetraoxide, I'm thinking not.

Is it something totally different? The three elements are confusing me.

Copper and Manganese are transitional metals, and Oxygen is 2-.

And another:

RhSiO3

Rh is Rhodium, a transition metal.

Si is +/- 4

O is -2

And yet another question:

For compounds such as In2S3 is it:

diindium trisulfide

or

indium trisulfide

or

indium sulfide

AND.....how do you know whether or not to use the prefixes mono, di, tri, tetra, penta, hexa, hecto, octo, nano, or deca? I know beginning ones do not need mono, but the others are confusing me.

Are you suppose to use them all the time, or for an exact cross over such as In2S3, do you just use Indium Sulfide. (Indium is +3, and Sulfur is -2)

Thanks a bunch to anyone that can help!! :)

OMG, thanks! I knew that, but for some reason I didn't catch the MnO4! I've caught the other polyatomics we had to learn, but that one snuck by! WHEW! Good thing I'm not taking my test right now! lol

I printed off some worksheets from online & practicing. Our first test is Wednesday.

Thanks again, and good luck to you! :)

hi,

CuMnO4 is COPPER PERMANGANATE

the MnO4 is regarded as one and has oxidation # of -1, copper has two possible oxidatn # +2 and +1. in this case it is Cu one but the one can be dropped. so the formula is named as above. hope it helps I am working on my homework right now. so i'm still up.

The RhSiO3 i'm not sure of

OMG, thanks! I knew that, but for some reason I didn't catch the MnO4! I've caught the other polyatomics we had to learn, but that one snuck by! WHEW! Good thing I'm not taking my test right now! lol

I printed off some worksheets from online & practicing. Our first test is Wednesday.

Thanks again, and good luck to you! :)

you are welcome. and In2S3 would be Indium Sulphide

note M and NM

you are welcome. and In2S3 would be Indium Sulphide

note M and NM

Thanks again. Yes, I just read where the prefixes are used to name molecular compounds...composed solely of nonmetals. :)

I guess I'm not doing too poorly for only 2 classes, but still have a long way to go before I'm ready for my test Wednesday!

Thanks, I understand this part now, not that it was that hard, just wasn't there yet in my mind...lol

Just to let you know you accidently wrote Metals were on the Right....just in case someone else reads this. :)

Thank you, thank you, thank you!!!!!!

ADDITION

to make it easier make use of a well laid out periodic table.

identify the metals and non metals. metals aree to the right of a thick line drawn on the table and non metals to the right of this line.

then u start with say compounds that have only two elements

e.g

1.CaCl2....... calcium chloride; CuCl2...... Copper 2 chloride; notice the 2 element are M and NM;

2. CO...... carbon monoxide; NO....nitrogen monoxide; N2O3.....Dinitrogen trioxide

notice that thses compounds contain 2 NM.

this is as far as i can go for now but u still have comp. having more than two elements. along the line as usual in chem there are a few where the rule is broken.

hope i make a little sense

thanks it was a typo

NM to the right M to the left

Thanks, I understand this part now, not that it was that hard, just wasn't there yet in my mind...lol

Just to let you know you accidently wrote Metals were on the Right....just in case someone else reads this. :)

Thank you, thank you, thank you!!!!!!

I'm thinking RhSiO3 is Rhomium Silicate. :)

:rotfl: Help! Ok, I have 3 problems I just can not figure out.

1. A sample of lead shot weighing 343.6 g was added to a graduated cylinder partially filled with isopropyl alcohol (enough to immerse the lead completely). As a result, the alcohol level rose 30.3 mL. What is the density of the lead in SI units? (the density of isopropyl alcohol is 0.785 g/cm3)

2. The RDA of calcium is 1200mg. Calcium carbonate contains 12% calcium by mass. How many grams of calcium carbonate are needed to provide the RDA of calcium? Honestly- I know the answer is 10 g but I can not tell you how to get the answer.

3. An office is 4.44m long, 3.48m wide, 2.53 m high. The avg density of air is 1.29 X 10 (exp -3). What is the mass (in kilograms) of the air in the office?

Any help would be great. Thanks guys.

The 1st problem is a tricky one. I could be wrong but it seems that the density of the Isopropyl may not matter but the mass of the lead along with the displacement of isopropyl matters. So, d= m/v= 343.6g/30.3mL

I think you're right on the answer for the 2nd problem but I'm not sure how to set it up. I mean 1.2g Ca/.12 Ca = 10g Ca

In the 3rd problem, I believe you can use the density forumla to get the answer. I would first take the dimensions given and convert them to cm and then multiply all three of the values and you should have your volume.

So, 444cm x 348cm x 253 cm = 3.91 x 10^7 cubic cm or mL.

Ok, now we're going to have to rearrange the density formula to get the mass.

d=m/v becomes d x v = m so, 1.29 X 10^-3 g/cubic cm X 3.91 x 10^7 cubic cm =50439 g.

Convert the mass into kg=50.4g.

Man, I hope that's right. Sorry if I'm way off base!

(I forgot to sign on under my own screen name, which is Soleilpie. So please don't get mad at Moonepie, if I totally don't know what I'm talking about! :)~ )