Chemistry - January 2007

A carbohydrate (consists of carbon, hydrogen, and oxygen ) is burned in oxygen producing only carbon dioxide and water vapor. Burning 2.15 g of this carbohydrate produces 3.53 g of CO2 and 1.44 g of H2O. Find the emperical formula of this carbohydrate.

2007-01-23 03:26:58 · 4 answers · asked by Anonymous

2007-01-23 03:23:49 · 3 answers · asked by Anonymous

2007-01-23 03:12:31 · 7 answers · asked by Ptolemy 1

Unable to buy at bras basah complex so would be great if someone could direct me elsewhere. thanks!

2007-01-23 03:07:34 · 6 answers · asked by Anonymous

The iron in a 1.375g sample containing some Fe2O3 is reduced to Fe2+ . The Fe2+ is titrated with 22.26 mL of 0.0195 M KMnO4 in an acidic solution (potassium is a spectator ion in this reaction).

Calculate the percentage of Fe in the sample.

The unbalanced equation for the reaction is
Fe2+ + MnO4- → Fe3+ + Mn2+

2007-01-23 03:07:24 · 1 answers · asked by AppleCard! 2

2007-01-23 03:03:02 · 4 answers · asked by Kitty 1

How do you answer this question? What is the answer?

2007-01-23 02:50:34 · 6 answers · asked by Kitty 1

please help me.. and fill in the blanks.

Ag + O2 ---> _____

Na + S ------> _____

C + Cl2 -----> _____

Al + I2 ------> _____

thanks.. it would also be helpful if you explained how u did it.

2007-01-23 02:49:20 · 3 answers · asked by thumbsucker. 2

Please explane this out to me. Thanks for the help =)

2007-01-23 02:47:03 · 3 answers · asked by Heavy Metal 3

2007-01-23 02:45:59 · 3 answers · asked by Kitty 1

How do the rates of diffusion of oxygen and sulfur dioxide compare? Molar masses: Oxygen is 32 g/mol and sulfur dioxide is 64 g/mol.

A. Oxygen diffuses at the same rate as sulfur dioxide.
B. Oxygen diffuses 1.4 times as fast as sulfur dioxide.
C. Oxygen diffuses twice as fast as sulfur dioxide.
D. Oxygen diffuses half as fast as sulfur dioxide.
E. Oxygen diffuses 0.71 times as fast as sulfur dioxide.

If any one knows this can you explain it!!!???

2007-01-23 02:45:50 · 3 answers · asked by MEB 2

2007-01-23 02:43:13 · 5 answers · asked by Kitty 1

Calculate the molarity of a solution of HI if 86.82 mL of the HI solution neutralize 0.741 g of Na2CO3.

2007-01-23 02:38:18 · 3 answers · asked by AppleCard! 2

http://www.cem.msu.edu/~reusch/VirtualText/Questions/Nomencl/nomencl.htm

2007-01-23 02:33:41 · 3 answers · asked by heartangel103 1

a 1.000 - gram sample that contains 0.0128 moles od a hydrocarbon was burned in excess air to convert all the components to CO2 and H2O. if 3.385 grams of CO2 and 0.692 grams of H2O are produced, what is the empirical formula of the hydrocarbon? what is the molecular weight? what is the molecular formula?

2007-01-23 02:33:11 · 2 answers · asked by piangpiang 2

a piece of iron wighing 0.920grams was heated until all the iron was converted to an oxide. if the weight of the oxide is 1.315grams, what is the formula of the oxide?

2007-01-23 02:28:57 · 3 answers · asked by piangpiang 2

or something that has it in it....

2007-01-23 02:28:35 · 4 answers · asked by Anonymous

what does magnesium oxide and water make... IN A FORMULA PLEASE. and please explain why.

2007-01-23 02:27:53 · 2 answers · asked by thumbsucker. 2

PH4+ (aq) + H2O(ℓ) <-> PH3(aq) + H3O+(aq)

Which of the following statements is/are true?:

1) The reaction could be classified as a neutralization reaction under the Bronsted-Lowry and Arrhenius acid/base theories, but not under the Lewis acid/base theory.

2) In this reaction, PH4+is a Lewis acid and H2O is a Lewis base

3) PH3 is the conjuage acid of PH4+.

4) The reaction could be classified as a neutralization reaction under the Lewis and Bronsted-Lowry acid/base theories, but not under the Arrhenius acid/base theory.

5) H2O could be classified as a base under all three acid/base theories (it does not have to act as a base under all three theories in this particular reaction for the statement to be true)

6) The reaction involves a proton transfer, so it must be a Lewis neutralization.

7) The reaction involves the formation of a coordinate covalent bond, so it must be a Lewis neutralization.

2007-01-23 02:27:22 · 1 answers · asked by AppleCard! 2

The air in a laboratory was measured with a barometer to be 7.40 x 102 mm Hg. What is the laboratory air pressure in atm?

2007-01-23 01:59:44 · 5 answers · asked by MEB 2

I need to know the pH of either isoprene or SBR ?

2007-01-23 01:41:39 · 2 answers · asked by kbx_4 1

a)aluminum carbonate
b)silicon dioxide
c)potassium sulfide
d)magnese (II) chromate
e)sodium bromide

if you kno these then plz try to help me, but u dont have to do these

4)according to the balanced equation for the combustion of ethane, C2H6, 2C2H6(g) + 7O(g)>>4CO2(g) + 6H2O(l), for every molecule of ethane that reacts, CHOOSE RIGHT ANSWR:
(A)2 molecules of carbon dioxide r produced (B) 3 molecules of water is produced (C)A&B D)neither

2007-01-23 01:39:24 · 2 answers · asked by truckin_90 2

Does anyone know what materials make up standard double yellow dot squash ball. % quantities will be much apreciated.

2007-01-23 01:37:51 · 1 answers · asked by lost_cyclist 1

2007-01-23 01:29:56 · 3 answers · asked by pankaj 2

2007-01-23 01:10:58 · 6 answers · asked by Anonymous

What are the different regions of the electromagnetic spectrum and the quantum change on these regions?

our topic is about refractive index..

thanks really for the help..

2007-01-23 00:53:41 · 1 answers · asked by carol 1

can i make a crystal ball from silica gel, if so, how. I have lots of silica gel and now have found a way of dissolving it, in hot alkali solution, but how do i now turn the dissolved gel into a crystal ball

2007-01-23 00:37:32 · 6 answers · asked by skorcha 1

will be cooking lots of food and need to know how many tanks to buy

2007-01-23 00:02:15 · 2 answers · asked by alleyesonyou1 1

When burning or melting a sugar cube, which one would be the chemical change and which one the physical change?

2007-01-22 23:06:45 · 3 answers · asked by rosecrashers1365 2

2007-01-22 23:02:05 · 8 answers · asked by rosecrashers1365 2