Chemistry - November 2006

A solution of a metal carbonate, M2CO3 was prepared by dissolving 7.46g of the anhydrous solid in water to give 1000 cm3 of solution. 25 cm3 of this solution reacted with 27 cm3 of 0.100M hydrochoric acid. Calculate the relative formula mass of M2CO3 and hence the relative atomic mass of the metal M.

2006-11-09 09:56:54 · 3 answers · asked by Anonymous

A 1.575g of a sample of ethanedioic acid crystals, H2C2O4.nH2O, was dissolved in water and made up to 250 cm3. One mole of the acid reacts with two moles of NaOH. In a titration, 25cm3 of this solution of acid reacted with exactly 15.6cm3 of 0.16M of NaOH. Calculate the vaue of n

2006-11-09 09:44:40 · 1 answers · asked by Joyce 4

2006-11-09 09:41:15 · 4 answers · asked by Black 1

I need to know the empirical and molecular formula of methanol (CH3OH)

2006-11-09 09:37:15 · 3 answers · asked by ventrue_1700 1

A. Germanium
B. Sulfur
C. Aluminum
D. Helium

2006-11-09 09:36:38 · 3 answers · asked by ♥ 6

does anyone have any info on science fair on the topics of

carboation CARBON DIOXIDE
or carbonated soft drinks
or anything on fizzy soft drinks?

2006-11-09 09:29:23 · 3 answers · asked by whitney b 2

2006-11-09 09:16:22 · 4 answers · asked by treupledFK 2

Can someone show me how to do this and explain it to me?

2006-11-09 09:08:27 · 3 answers · asked by Anonymous

2006-11-09 08:54:09 · 3 answers · asked by danette p 1

this is my question, how many kg of iron can be produced out of 100 kg of hematite?

2) is hematite (Fe3O4) richer in iron than hematite..

i dont need the answer but i just really need how to count them.. explain it in a way i can understand..

how do i count it and what is the diffrence between hematite and magnetite?

2006-11-09 08:22:51 · 3 answers · asked by orlyandsa 4

3.88 g of monoprotic acid was dissolved in water and the solution made up 250cm3. 25cm3 of this solution was titrated with .095 M NaOH solution, requiring 46.5cm3. Calculate the relative molecular mass of the acid.

2006-11-09 07:54:33 · 4 answers · asked by Joyce 4

2006-11-09 07:48:02 · 10 answers · asked by EJ 1

2006-11-09 07:47:33 · 9 answers · asked by reaful 2

2006-11-09 07:22:45 · 7 answers · asked by Miss D 7

1.) Iron fillings added to copper (II) sulfate in solution

2.) Aluminum metal reacts with oxygen to form aluminum (III) oxide

2006-11-09 07:19:49 · 1 answers · asked by Anonymous

why are trans isomers more stable than cis isomers?

2006-11-09 07:18:35 · 2 answers · asked by Pooh 4

What volume will 300mL of gas at 20C and a pressure of 335mm Hg occupy if the temperature is reduced to -80C and the pressure increased to 760 mmHg?

2006-11-09 07:17:39 · 3 answers · asked by megan6288 1

which scientific principle works here?

2006-11-09 07:17:24 · 1 answers · asked by suzy 2

How is the number of nonbonded and unbonded pairs determined?

2006-11-09 07:16:45 · 1 answers · asked by Connie 1

What is the atomic number of an atom with 22 protons and 26 neutrons?

2006-11-09 07:09:42 · 4 answers · asked by pickle juice 2

plz help me...

2006-11-09 07:03:12 · 2 answers · asked by urlast2003 1

2006-11-09 06:57:10 · 4 answers · asked by fernando t 1

2006-11-09 06:47:45 · 6 answers · asked by Steve B 1

A gaseous sample weighing 0.896 g was found to occupy a volume of 524 mL at 730 mmHg and 28C. What is the molar mass of the gas?

I know I have to use M= mRT/PV

Theres an example in my book to set it up:

=0.896g x 62,400mL-mm Hg/mol-K x 301 K / 730 mmHg x 524 ml

My question is, where did that 62,400 mL-mm come from?

2006-11-09 06:37:34 · 3 answers · asked by megan6288 1

Poly there is used for reainwater guttening. Explain the reasons for it's use? Some olther guttening may be made from iron explain why polythene would be a better choice?

2006-11-09 06:35:07 · 6 answers · asked by Rabeea R 1

3. Some of the reactions of halogens are shown below. They are all examples of redox reactions. In each case state which element is oxidised and which is reduced, and give the oxidation states before and after the reaction. It says it wants you to put the state numbers under each element etc.

a) 2AgCl = 2Ag + Cl2
b) Cl2 + 2OH- = Cl- + ClO- + H20
c) 2Fe + 3Cl2 = 2FeCl3
d) 3Br2 + 6OH- = BrO3- + 5Br- + 3H2O
e) 2Br- +2H+ + H2SO4 = Br2 + So2 + 2H2O
f) 8I- + 8H+ + H2SO4 - 4I2 + H2S + 4H20
g) 4IO3- = 3IO4- + I-
h) H2 + Cl2 = 2HCL
i) 2F2 + 2H2O = 4HF + O2

Please notice that you will have to look quite hard to see the minus signs!

Thanks for all your help, much appreciated! Please

2006-11-09 06:32:04 · 3 answers · asked by Anonymous

Plastic are non-biodgredable.Explain what this mean , the problems this causes and other ways we can deal with plastic waste?

2006-11-09 06:18:55 · 5 answers · asked by Rabeea R 1

basic pinciple and calculations.

2006-11-09 05:47:56 · 3 answers · asked by busisiwe n 1

A. 2 Na (cr) + 2 H2O (1) --> 2 NaOH (aq) + H2 (g)
B. Na (cr) + 2 H2O (1) --> 2 NaOH (aq) + H2 (g)
C. 2 Na (cr) + 2 H2O (1) --> 2 Na OH (aq) + 2 H2 (g)

2006-11-09 05:23:23 · 4 answers · asked by cetinnovations 1

(a) new elements are produced
(b)atoms are destroyed
(c)atoms are rearranged
(d)elements are destroyed

2006-11-09 05:08:19 · 9 answers · asked by TaylorSwift_2012 1