Chemistry - January 2007

I think to use Alum but what type of Alum. Anyone with a good recipe. Please help

2007-01-29 14:58:02 · 1 answers · asked by ana v 1

2007-01-29 14:49:17 · 4 answers · asked by soundprovider 1

Potassium iodide + lead (II) nitrate --> lead (II) iodide + potassium nitrate

Magnesium chloride + amonium nitrate --> magnesium nitrate + ammonium chloride

Thanks in advance!!

2007-01-29 14:41:34 · 1 answers · asked by SUnny S 1

2007-01-29 14:17:19 · 5 answers · asked by Creative Name 3

1.A sample of a gas occupies 3092 milliliters at
20.0±C and 4950 torr. What volume would it
occupy at the same temperature and 414 torr?
Answer in units of mL.


2. A 34 L tank contains a gas under a pressure
of 403 atm. What volume would the gas
occupy at the same temperature at 750 torr
of pressure? Answer in units of L.

2007-01-29 14:04:38 · 2 answers · asked by dojorno5 2

a) Solutions of bromine (Br2(aq)) are brown. Explain how this could be used to distinguish between ethane and ethene.

b) Would you expect bromine solutions to react with benzene?

I'd appreciate any help, thank you!

2007-01-29 13:48:32 · 3 answers · asked by Dark42 2

What is inside an atom?Is neutrons Negative or positive?Or niether?I'm having a quiz on this and my teacher explained it wrong.

2007-01-29 13:38:00 · 12 answers · asked by Anonymous

Pb(SO4)2 + 4 LiNO3 = Pb(NO3)4 + 2Li2(SO4)


How many grams of lithium nitrate will be needed to make 250 grams of lithium sulfate, assuming that you have an adequate amount of lead (IV) sulfate to do the reaction?


Show work please!



Correct answer will get you 10 points =)

2007-01-29 13:29:52 · 4 answers · asked by Anonymous

3.95 g of a hydrocarbon, C20H16, were burned in excess oxygen in a constant-volume calorimeter surrounded by 1300. g of water. As a result the temperature of the water and the calorimeter rose from 21.0 oC to 25.7 oC. The heat capacity of the calorimeter was 255.642 J/oC.


Calculate DE (kJ/mol) for the combustion of the hydrocarbon based on these readings.


Enter a numeric answer only, do not include units in your answer.

2007-01-29 13:09:34 · 1 answers · asked by yani_sabree 2

Calculate the standard enthalpy change in kJ for the production of 15.2 g of CO2 (g) from a reaction where the reactants and products are:

reactants: CH4 (g) O2 (g)

products: CO2 (g) H2O (g)

2007-01-29 13:09:07 · 1 answers · asked by yani_sabree 2

2007-01-29 13:08:00 · 2 answers · asked by chrisletheby 1

The bible speaks of a new heaven and a new earth. It says 'the elements shall melt with a fervent heat'. Is it possible that a 'fervent heat' was how these chemical elements were created in the first place ?

2007-01-29 13:03:08 · 3 answers · asked by democracynow 2

i need to know..its for hw!!!!!!!!!!! thank u sooooooo much...

2007-01-29 12:57:57 · 7 answers · asked by Anonymous

scott foresman science book 4 grade

2007-01-29 12:55:29 · 1 answers · asked by soccerkarthik 1

why does it explode when you mix vinegar and baking soda?

2007-01-29 12:48:08 · 6 answers · asked by DJ 1

The creation of the first elements must necessarily have occurred before the first matter was formed. Therefore, logically, the science of chemistry is founded on the presupposition that creation has definitely occurred, since all matter known to science is composed of chemical elements and there never was a time when chemicals existed without the elements.

It is therefore logical that all chemists should believe in the creation of the chemical elements whether they disagree about the origin of that creation. Creation is not simply an opinion but, to the chemist, is a logical basis for their science.

2007-01-29 12:47:23 · 12 answers · asked by democracynow 2

why is barium sulfate used in xray diagnosis of intestinal systems?

(is that the only type of xray its limited to?)

thanks.

2007-01-29 12:34:45 · 3 answers · asked by Anonymous

2007-01-29 12:32:32 · 2 answers · asked by Gideon 1

ok. so since NaHCO3 is soluble in water and all, will a double replacement reaction still take place even if it's mixed with a solution of hydrochloric acid? ... why?

i know that carbonic acid immediatley decomposes to form carbon dioxide and dihydrogen oxide...?

2007-01-29 12:30:52 · 3 answers · asked by Madison 1

2007-01-29 12:21:05 · 10 answers · asked by Anonymous

longer to boil or no?

If so why? Why doesn't it being purifies make a difference?

2007-01-29 12:20:34 · 1 answers · asked by ♫♪♫ PINKY ♫♪♫ 5

okay, so when we balance equations say i have like Fe +3 and NO3 - added to Na+ PO4 3-, do i just balance it like that, or do i do criss cross to determine subscripts?

help would be highly appreciated. :)

2007-01-29 12:10:22 · 3 answers · asked by Stacey 3

I just had a well drilled and I have had it tested for coliforms and e.coli and they are absent, but I think it tastes salty. Can I test for this myself at home?

2007-01-29 11:53:11 · 9 answers · asked by Christie H 1

please at least try to get me three

2007-01-29 11:47:01 · 2 answers · asked by lilbutterfly555 1

what is an item that can relate to chemistry...it cant be anything illegal... and HOW does it relate to chemistry

2007-01-29 11:45:46 · 7 answers · asked by missunderstood 2

could it react w/ either Ag(NO3)2 or anything else

2007-01-29 11:43:11 · 1 answers · asked by THE ICE AGE 2

2007-01-29 11:41:08 · 3 answers · asked by Anonymous

Which of five general types of reaction would moslikely occur, given each set of reactants? What are the probable products? a. an aqueous solution of two ionic compounds b. a single compound c. two elements d. oxygen and a compound of carbon and hydrogen

2007-01-29 11:30:43 · 1 answers · asked by Jean D 1

2007-01-29 11:30:24 · 4 answers · asked by Gideon 1

2007-01-29 11:27:45 · 3 answers · asked by Trina Bean 2