Chemistry - January 2007

It's a Homework question but
here it is....
Which is more effective, sodium acetate or sodium stearate ??
Please help i have no clue..

2007-01-02 05:31:18 · 8 answers · asked by ilshdw 3

1)copper
2)polythene
3)wood
4)stainless steel
5)aluminium
6)air

2007-01-02 05:24:47 · 7 answers · asked by ? 1

1)generally which are the best conductors- solids, liquids, gas
2)which state of matter has particles closest together
3)is there a link between arrangements of particles and whether something is good at conducting

2007-01-02 04:59:17 · 6 answers · asked by ? 1

Hi all,

I am looking to find chemcial assay procedure of mercury though i tried to google it and at moment i dont have any other resource like library or reference materials to check it out . so any one here can pls help me with step by step procedure for assay of mercury , silver and copper. I need procedure exactly for determination of % of purity of above mentioned metals.

2007-01-02 04:58:17 · 2 answers · asked by Amarnath K 1

2007-01-02 04:43:42 · 6 answers · asked by Anonymous

2007-01-02 04:14:27 · 6 answers · asked by Anonymous

Hi! I'm doing some chemistry, and I've reached a part about moles, which, in my opinion, is simple but they try to make it more difficult than it has to be (who knows, maybe I'm over-simplifying it and it'll bite me in the butt later). That's what I'm trying to find out. Please tell me if this is correct (I've read through like 10 pages of explaining and this is basically what I've summized).

For the question, "The molecular formula of hydrogen peroxide is H[sbscrpt2]O[sbscrpt2]. What is the gram molecular mass?"

So basically, take the atomic mass of 1 atom of each element. That equals 1 mol. Multiply it by however many moles there are (a.k.a. how many atoms of that element there are), and that is the gram molecular mass.

Is that right? By my figuring that would work out to:

(# of atoms, written as mol) X (atomic mass) = answer in g

2 mol H X 1.0g / 1 mol H = 2.0g H
2 mol O X 16.0g / 1 mol O = 32.0g O
Total gmm = 34.0g

Thank you, I really appreciate this!

2007-01-02 04:13:19 · 5 answers · asked by Anonymous

2007-01-02 04:01:05 · 8 answers · asked by rayleekp 2

how many cubic centimetres of a solution of hydrochloric acic, of concentration 2 mol dm-3, are required to react completely with 50cm3 of a solution of barium hydroxide that contains 68.4 g dm-3?

2HCl (aq) + Ba(OH)2 (aq) ==> BaCl2 (aq) + 2H2O(l)

the answer given is actually 20 cm3, but i just dont know how to get to that, so can you show all the steps of your working out of how to get to that answer. thanks

2007-01-02 03:54:25 · 4 answers · asked by b2606 1

2007-01-02 03:23:47 · 1 answers · asked by Baby Girl Ballin' 1

5Fe2+ 8H+ + MnO4 - = 5FE3+ + Mn2+ + 4H2O

the question is asking me determine the % of iron II and iron III in a mixture containing both, where i am given 200cm3 of a solution containing 1.3g of iron ions(Fe 2+ Fe 3+) using potassium magnanete

(here is where i get confuse) You may assume that each of the 2 ions of is present to at least 30% by mass (doesnt this contradict the question?)

also, i tried calculating it out via those normal calculas titration method but i cant go any further unless if i know the vol. of potassium maganate used to titrate the iron solution.

Can i just make it up what vol. is required to titrate the iron solution with the potassium maganate??

2007-01-02 02:50:13 · 3 answers · asked by Anonymous

a standard solution was prepared by dissolving 2.6061g of anhydrous sodium carbonate in deionized water, and the solution dilated to 250cm3. a 25cm3 portion of this solution was titrated against hydrochloric acid, using a suitable indicator. the endpoint was reached after 18.7cm3 of acid had been added. calculate the concentration of the acid.

2007-01-02 02:50:03 · 5 answers · asked by b2606 1

Fe(s) + 3O2(s) = 2Fe2 O3(s)

There is 1 mole of Fe and 2 moles of 2Fe2 O3.

1 mole of Fe is 56g and 2 moles of 2Fe2 O3 is 320g.

(56/56)*11.2g gives you 11.2g of iron, as asked for in the question, so we must do the same calculation for 2Fe2 O3.

so, (320/56)*11.2g = 64g

Therefore, 64g of iron oxide is produced.

2007-01-02 02:21:38 · 2 answers · asked by Jen 3

2007-01-02 02:00:14 · 4 answers · asked by Thank you 1

2007-01-02 01:55:56 · 9 answers · asked by Thank you 1

Is it possible to see an atom with a microscope???? Please add extra info ( p.s i am only 12)

2007-01-02 01:51:19 · 7 answers · asked by Anonymous

2007-01-02 01:39:27 · 7 answers · asked by BloodyxXxRomance 3

What is the difference between electrophilic, nucleophilic and free radical substitution?
What is the difference between electrophilic and nucleophilic addition.
How do you know whether a reaction is nucleophilic, electrophilic or free radical?

2007-01-02 01:38:04 · 6 answers · asked by Anonymous

First Question: If pressure goes up, volume goes _________ while temperature is being held constant.

Second Question: If volume goes up while holding temperature constant, what happens to the pressure?

Third Question: If pressure goes up while volume is being held constant, what happens to the temperature?


I cant figure it out & I looked it but can someone please help me?

2007-01-02 01:28:19 · 5 answers · asked by Anonymous

okay... i understand the equation needs to be balanced.
i think.. .all the "aq" molecules split up into ions...
But HOW do i know that CuSO4 becomes:
Cu 2+(aq) + SO4 2-(aq)???

how do i find out?
many thanks x

2007-01-02 01:15:03 · 4 answers · asked by cinnamonstar123 2

Besides the four main factors that effect rate of reaction (surface area, concentration, temperature and the use of a catalyst), do mass [of a substance such as marble chips] or volume [of an acid such as hydrochloric acid] effect rate of reaction, and if so why? If not, why also?

2007-01-01 23:49:11 · 3 answers · asked by mbchelsea 1

PLEASE IT IS FOR MY ASSIGNMENT

2007-01-01 23:38:42 · 8 answers · asked by edexagen 1

i know what exactly are the name's given,but i need to know how can i learn the numbers given biheart!
people please understand my problem and help me!!!!!!!!

2007-01-01 23:04:11 · 5 answers · asked by Anonymous

is it AMQXLS? I can't find the letters representing a diamond and what they mean...

2007-01-01 22:38:39 · 13 answers · asked by NoOneOfInterest 1

i think they can be removed but if so which noble gas requires the most energy to remove electrons?

2007-01-01 20:27:40 · 5 answers · asked by Anonymous

2007-01-01 19:29:39 · 8 answers · asked by Anonymous

1)Li3PO4(aq) + Sr(OH)2(aq)

net ionic> Li3PO4(aq) + Sr(OH)2 > Li3(OH)2(s) +PO4Sr (aq)

was Li3(OH)2 the right solid and why or why not?
thanks

2007-01-01 19:20:38 · 3 answers · asked by Anonymous

reaction of elements
joining of some elements and produce new mixture

2007-01-01 18:51:42 · 4 answers · asked by ali abbas aman 1

2007-01-01 18:07:06 · 2 answers · asked by simply_me 3

From the possible choices of

a. a metal that forms a positive ion
b. a metal that forms a negative ion
c. a nonmetal that forms a positive ion
d. a nonmetal that forms a negative ion

2007-01-01 16:51:04 · 4 answers · asked by Melody 1