Chemistry - May 2007

the process of it

2007-05-27 16:19:46 · 1 answers · asked by bekki 1

1.537 g of unknown sample is digested in HNO3/HCl, made up to 100 ml and then diluted 2:25. The absorbance of the solution is 0.638.

Could you please show working out.

2007-05-27 15:28:53 · 1 answers · asked by Anonymous

2007-05-27 14:58:03 · 2 answers · asked by neas182000 1

This is all I know what do i do!!?

2007-05-27 14:56:41 · 2 answers · asked by neas182000 1

Ok, you get two drinks out of the frig, say a can of coke and a bottle of water or a bottle of juice and water. You put both drinks in a glass with ice, why is it the water always keeps the ice longer then the other drinks.

2007-05-27 14:53:53 · 4 answers · asked by denisemorales 2

2007-05-27 14:45:25 · 3 answers · asked by Anonymous

ok, ive got a burning ? does any one know how silvertytrate* goes directley into your blood stream? and what is the reaction of ultraviolet?

2007-05-27 14:42:13 · 3 answers · asked by gabb 2

2007-05-27 14:33:27 · 2 answers · asked by Anonymous

2007-05-27 14:16:22 · 4 answers · asked by Anonymous

what is the difference between hot and heat.

2007-05-27 13:20:07 · 4 answers · asked by Shiden 3

2007-05-27 12:59:02 · 4 answers · asked by Anonymous

Acid precipitation is any precipitation that has a PH less than 7.

2007-05-27 12:55:40 · 5 answers · asked by TheGreatest 3

2007-05-27 12:34:45 · 2 answers · asked by theweirdguy1 2

Carbon in the atmosphere decomposes the ozone layers (O3) into oxygen gasses (O2)??

Do all carbons does this or only certain or particular ones such as CFCs that contain chlorine?

2007-05-27 12:33:02 · 3 answers · asked by Forwardium 1

what is the decomposition reacitn of KNO3?....
KNO3-->K + NO3?

it says nitrate ions give up 1/3 of their oxygen...doesn't look like it in the equation...help!?

2007-05-27 10:41:25 · 4 answers · asked by no name 1

If a reaction is reversible, what are the relative amounts of reactant and product at the end of the reaction

a. no reactant; all product

b. no product; all reactant

c. some product; some reactant

d. the relationship between reactants and products cannot be determined.

2007-05-27 10:31:01 · 2 answers · asked by zerokun4 1

At equilibrium what is the rate of production of reactants compared with the rate of production of products

a. much higher

b. higher

c. the same

d. lower

2007-05-27 10:29:07 · 4 answers · asked by zerokun4 1

A reaction X <---> Y occcurs in a closed vessel. When it reaches equilibrium at temperature T, the number of molecules changing from X to Y is equal to the number of molecules changing from Y to X.

True or False

2007-05-27 10:24:56 · 3 answers · asked by zerokun4 1

In an exothermic reaction, an increase in temperature favors the formation of products T/F (True or False)

2007-05-27 10:22:59 · 2 answers · asked by zerokun4 1

This is for my final project in chemistry. Can anyone give me links or possible explainations if you are knowledgable with this. It will greatly be appreciated. Thanks!

2007-05-27 10:17:49 · 1 answers · asked by Anonymous

(1) C-12 and N-14
(2)C-12 and N-16
(3) C-14 and N-14
(4)C-14 and N-16

i know the answer is (4) but why?

2007-05-27 09:05:27 · 6 answers · asked by s.weiss 1

2007-05-27 08:43:55 · 3 answers · asked by Anonymous

I'm writing an article on how Spinach is NOT the Iron source people think it is .. Can anybody please explain the process in which Oxalate works as a complexing agent and binds Iron in the Human body to make Ferrous Oxalate ?.. If you can even write down the chemical reaction .. Thank you ...

2007-05-27 08:41:24 · 2 answers · asked by Anonymous

I have to make 0.05 M of solution of a substance, i was thinking about using Copper II Acetate, but if you have other easier substances maybe i can use them , I also need a detailed description of how i made the solution, the common and chemical name of the substance and its formula.

2007-05-27 08:25:40 · 2 answers · asked by Anonymous

"The Earth's carbon sinks -- of which the Southern Ocean accounts for 15 percent -- absorb about half of all human carbon emissions. With the Southern Ocean reaching its saturation point, more CO2 will stay in our atmosphere."

How does carbon sink work chemically? What will happen to the H2O that is absorbing the CO2? How will this affect the atmosphere and ozone layers? Meaning, if the ocean so saturated that it could not absorb CO2 anymore, will the CO2 then stays up in the atmosphere? Would it then decomposes into chlorine to destroy ozone layers? What are the consequences of this? Would it speed up the Global Warming? And what other things that can happen in relation to this - and its cause and effect?

Also can you depict this whole picture (of what is happening as described above) into chemical equations, and related concepts in chemistry?

Thank you!

2007-05-27 08:14:49 · 3 answers · asked by Forwardium 1

Vitamin C, Amino Acid Blend, Vitamin B Complex, Calcium, Cayenne Pepper Piperazine Blend, Magnesium.

It says it also contains philenilanaline (sounds simular neway).

2007-05-27 08:02:08 · 1 answers · asked by Anonymous

I have a word of the day contest with a friend and this is what i got. I dont know what it is tho. I think its a type of gas cause of the methane part. im sure its a chemical but dont know what it does or what its used in?

2007-05-27 07:44:10 · 4 answers · asked by camocadet 1

Hydrogen only usually forms one bond but only with Boron complexes you can have two bridging Hydrogens with two Boron atoms.

2007-05-27 07:39:44 · 4 answers · asked by Anonymous

How do you convert from kJ/g to kJ/mol?

2007-05-27 07:34:50 · 3 answers · asked by Anonymous

HCl is polar covalent molecule, but why does it form ions in water? What causes it to happen? Ionic compounds that can dissociate are because of formation of ion-dipole bonds that produces energy greater than that needed to break the ionic lattice. HCl is covalent, but it dissociates because of polar nature of water? If so what is the exact interaction between molecules that casues it to happen?

2007-05-27 07:30:13 · 3 answers · asked by Anonymous