Chemistry - July 2007

i know that hexane is non-polar however i am having trouble finding information on its uses as a solvent. I am also wondering how reliable the old adage "like dissolves like" is in relation to polar and non-polar substances and if there is a better adage?

2007-07-28 21:05:12 · 2 answers · asked by Jess 1

It is said that if you soak grubby socks or coffee stained fabric in hot salty water for a few hours it will remove the stain. this is said to be a natural alternative to bleaches etc. so what is the chemistry behind this?

2007-07-28 20:55:21 · 1 answers · asked by Jess 1

i have to answer a chemistry question on how soda water followed by a towel press will clean coffee out of carpet. i was hoping to find out the relative equations and principles behind the cleaning capabilities of soda water and whether it is the bubbles or the carbonic acid which does the cleaning.

2007-07-28 20:37:20 · 2 answers · asked by Anonymous

i don't know how to answer this, some one please help thanx very much

2007-07-28 20:19:23 · 3 answers · asked by Pat U 1

this is an experiment on heating the nitartes and carbonates of the s-block element.
a)lithium nitrates and lithium carbonate
b)potassium nitrates and potassium carbonate
c)magnesium nitrates and magnesium carbonate

2007-07-28 20:16:19 · 3 answers · asked by ystan n 1

this is an experiment on heating the nitartes and carbonates of the s-block element.
Li2CO3, MgCO3, CaCO3, SrCO3, BaCO3, LiNO3, NaNO3, KNO3, Mg(NO3)2, Ca(NO3)2, Sr(NO3)2, Ba(NO3)2

what is the change on thermal stability when down the group?
Is increasing or decreasing down the group?

2007-07-28 20:15:48 · 2 answers · asked by ystan n 1

On further heating,they become white solids again,before they decompose.

this is an experiment on heating the nitartes and carbonates of the s-block element.
Li2CO3, MgCO3, CaCO3, SrCO3, BaCO3, LiNO3, NaNO3, KNO3, Mg(NO3)2, Ca(NO3)2, Sr(NO3)2, Ba(NO3)2

2007-07-28 20:15:46 · 4 answers · asked by ystan n 1

Hey Guys,
I was given some equations to work out for homework. Most of them I have got but some of the harder ones I cannot. For each we have been told one of the products that they form. But this still doesnt help for me.

Can anyone help?

They are:

KMnO4 + FeSO4 (Have been told that it forms MnO2)

FeSO4 + NaSCN (Have been told that it changes Fe2+ to Fe3+)

CuSO4 + HCl (Have been told that it forms [CuCl4]2-)

CuSO4 + NaOH + heat (Have been told that it forms CuO)

Any help is much appreciated.
Thanks

2007-07-28 19:47:07 · 1 answers · asked by Anonymous

what is the importance of knowing which candles burn faster the white or colored ones tnx! :) this is for my investigatory project. please answer as soon as possible .. thank you very much

2007-07-28 19:45:03 · 5 answers · asked by kat_silver07 1

2007-07-28 18:19:10 · 3 answers · asked by vivek b 1

what could the reaction be?

2007-07-28 17:09:59 · 1 answers · asked by rocky 2

2007-07-28 16:59:05 · 1 answers · asked by cute guy_206 1

sodium carbonate+ calcium chloride = sodium chloride + water + carbon dioxide(gas lost)

2007-07-28 16:11:59 · 3 answers · asked by jrv 2

sodium carbonate + calcium chloride= sodium chloride + calcium carbonate

2007-07-28 15:57:50 · 5 answers · asked by jrv 2

2007-07-28 13:59:30 · 2 answers · asked by curious j 1

1. anaphase, interphase, prophase, metaphase, telophase
2. interphase, prophase, metaphase, anaphase, telophase
3. telophase, prophase, interphase, anaphase, metaphase
4. metaphase, interphase, prophase, anaphase, telophase


An operon typically governs ____________.

2007-07-28 13:46:52 · 3 answers · asked by Anonymous

shrivel
lyse
neither gain nor lose water
lose water

One of the compounds that is a direct output of the Dark reaction is____.

2007-07-28 13:46:01 · 4 answers · asked by Anonymous

An electron in an excited metal atom falls from the 7d orbital to the 6p orbital. If the energy of the 7d orbital is -2.08e-19 J and the energy of the 6p orbital is -6.29e-19 J, what will the wavelength of the emitted photon be in units of nanometers?

2007-07-28 13:23:26 · 2 answers · asked by bla 1

I know I can buy it online but I was looking for a store i could walk into and buy it.

2007-07-28 13:15:01 · 3 answers · asked by kobra0190 2

2007-07-28 13:02:34 · 5 answers · asked by bla 1

how long will this last?

2007-07-28 12:10:04 · 7 answers · asked by Camilo 1

Kudzoo is out of control throuhout the South.

2007-07-28 11:26:37 · 5 answers · asked by Tracer8 1

2007-07-28 11:22:18 · 6 answers · asked by Anonymous

According to the Bronsted-Lowry definition,
an acid is a proton acceptor.
an acid acts as the solvent.
a base is a proton donor.
a base is a proton acceptor.
a base produces H+ ions in aqueous solutions.

2007-07-28 11:19:03 · 5 answers · asked by hanaayr 1

Also regarding Apopyllite can pure form of
Fluorapolphyllite and Hydroxyapophyllite be found in nature?
I realise that Olivine (Forsterite/Fayalite) and Apopyllite (Fluorapolphyllite/ Hydroxyapophyllite) are solid solutions but in theory at least can all four exist as seperate minerals?
Any help would be appreciated.

2007-07-28 11:16:56 · 2 answers · asked by Gideon 1

How do you calculate the molarities of the original HCl solutions,

18.00 mL of 0.555 M NaOH solution is titrated with 24.65 mL of HCl solution

-thnx

2007-07-28 10:38:05 · 2 answers · asked by LYF 1

2007-07-28 08:21:26 · 10 answers · asked by jassi s 1

The rest of the question is was dried (vapor of that liquid removed), the gas had a volume of 1.90 L at 25°C and 785 torr. Calculate the vapor pressure of this liquid at 25°C.

2007-07-28 07:48:41 · 2 answers · asked by Big H 1

"Complete and balance the following equations. For reactants, list formulas in the same order as given in the problem statement. If there is more than one product, list the metal-atom containing product first. Enter coefficients without a space between the formula and its coefficient, leaving off coefficients of 1 (1 is implied). For hydrated salts, enter the · as a regular period."

1) Reactant: SnCl2·2H2O
____ ---------> ___ + ___

2007-07-28 07:38:58 · 1 answers · asked by lulu 1

do you whant to help to invent a evil invention tell me your idea and how and i well do it if i love it!

2007-07-28 04:51:37 · 6 answers · asked by dr.seuser 1