Chemistry - June 2007

I get the SO-subscript 2 part easy enough, but where does the (IV) in the title come from? What does it imply and why is it there?

2007-06-07 17:51:36 · 4 answers · asked by Anonymous

2007-06-07 16:42:23 · 8 answers · asked by super sonic* 3

can anyonr plzzzzzzzzzzzzzzzzzzzzzzz tell me a non enzymatic method for estimation of total dietary fibre in food products, itz vry urgently required.

whatz the difference between true protein and total protein, is crude protein and total protein d same.

2007-06-07 16:37:40 · 2 answers · asked by pumba 2

the 2 neg. up top thing...is the 2-, just duno how to put it up there! Please help!

2007-06-07 16:10:16 · 2 answers · asked by Anonymous

Is it a redox, nonredox? And single or double replacement?!?!

2007-06-07 15:56:25 · 7 answers · asked by Anonymous

Octane has a density of 0.692 g/mL at 20°C. How many grams of O2 are required to burn 8.40 gal. of C8H18?

2007-06-07 15:26:11 · 2 answers · asked by Ham Wallet 1

1.) One mole of anything is equal to _____ particles of that substance

2.)One mole of sodium would have a mass of _____ grams.

3.)One mole of AuCl3 would have a mass of _____ grams.

4.)36 grams of Be would be equal to _____ moles of Be.

5.)250 grams of H2SO4 would be equal to _____ moles of H2SO4.

6.)When the equation Fe + Cl2 ? FeCl3 is balanced, the coefficient in front of the Cl2 is _____.

7.)When the equation KClO3 ? KCl + O2 is balanced, the coefficient in front of the KClO3 is _____.

8.)According to the following unbalanced reaction, how many grams of Fe2O3 are formed when 16.7 g of Fe reacts completely with oxygen? Fe + O2 ? Fe2O3

2007-06-07 14:33:12 · 2 answers · asked by Anonymous

please give me a reation equation or molecule equation

2007-06-07 14:31:59 · 3 answers · asked by Anonymous

?SiCl4 + ?H2 + ? Si -> ?HSiCl3 + ?SiCl4 + ??
I can't figure out what subscript and other things to use and what numbers and chemicals should be used where the question marks are.

2007-06-07 13:21:32 · 4 answers · asked by thirdrockloser 2

1.) The atomic number of an element is equal to the number of _____.

2.)The elements found in Group 17 on the periodic table are also known as the _____.

3)As you move toward the right of the periodic table, the atomic size of the atoms generally _____.

4.) When an atom loses electrons, _____.

5.)What is the charge of a calcium ion?

6.)What is the charge of a bromine ion?

7.)What is the correct name for the N3- ion?

8.) What is the correct name for the Ba2+ ion?

9.)The charge on a chlorine ion is?

10.)The charge on a sodium ion is?

2007-06-07 13:17:26 · 6 answers · asked by Anonymous

Calculate the pressure of the gas in the manometer in KPAs 104 kpa and 21 mm of Hg

2007-06-07 13:02:53 · 1 answers · asked by Anonymous

Not the drilling or transportation of oil. Just from the coking process and related refining energy losses.

2007-06-07 12:49:00 · 3 answers · asked by Anonymous

Amino Acid glycine-pka of 9.6, can exist in either protonated form (nh3+) or free base (-hn2)
(a) In what pH range can glycine be used as an effective
buffer due to its amino group?
(b) In a 0.1 M solution of glycine at pH 9.0, what fraction
of glycine has its amino group in the ONH3
form?
(c) How much 5 M KOH must be added to 1.0 L of 0.1 M
glycine at pH 9.0 to bring its pH to exactly 10.0?
(d) When 99% of the glycine is in its ONH3
form, what
is the numerical relation between the pH of the solution and
the pKa of the amino group?

2007-06-07 12:08:46 · 3 answers · asked by untamedblade 1

1) Why is concentrated sulfuric acid used in the reaction? (How exactly does it make the reaction more propense?)

2) Why is cold distilled water added to the mix?

2007-06-07 12:06:07 · 1 answers · asked by cactuar2k 3

i just did a "slime lab" in chemistry and we are learning about cross-linked polymers- why does the glue need to be diluted? what would have happened if it wasn't? and what would have happened if there was too much water?

2007-06-07 11:58:55 · 1 answers · asked by iheartyoumorethanbunnyz 1

I was watching an episode of CSI and it was about a man who gambled, and at every tournament he ate about a pound of chocolate.

And he mysteriously died one night after arguing with a waitress.

So it turns out that the waitress put Visine in his drink to give him diarrhea, but instead, since the cocoa used to make the chocolate was from Africa, and the acid rain in Africa is full of lead, which got into the cocoa plants, leaving small traces of lead in the chocolate, which filled the man with lead deposits, reacted with the high level of lead in his body, killing him instantly.

How did this happen? Like what reacted with what, that wouldve caused the man to fall over dead? They never said, and it has been bothering me.

2007-06-07 11:50:53 · 1 answers · asked by RethinkxxEverything 2

Now it is believed that the early prebiotic atmosphere of earth was probably O2-rich with some nitrogen, a less reactive mixture than Miller’s, with larger amounts of carbon dioxide, which would greatly deter the development of organic compounds!
A major source of gases was believed to be volcanoes, and since modern-day volcanoes emit CO, CO2, N2 and water vapour, it was considered likely that these gases were very abundant in the early atmosphere. In contrast, it is now believed that H2, CH4 and NH3 probably were not major components of the early atmosphere, as Dr. Stanley Miller had used in his well known experiment. Furthermore, many scientists now believe that the early atmosphere probably did not play a major role in the chemical reactions leading to life.
Although the composition of the atmosphere of the early earth is now believed to have consisted of large amounts of carbon dioxide. The oxygen we need to live KILLS abiogenesis!!!

2007-06-07 11:37:58 · 4 answers · asked by Old Truth Traveler 3

2007-06-07 11:15:09 · 1 answers · asked by Anonymous

2007-06-07 11:02:28 · 1 answers · asked by R C 2

If a student left the lab early and weighed the cool crucible and used the mass of the crucuble, cover, and magnesium oxide. Explain.

2007-06-07 10:56:52 · 1 answers · asked by jasonanthonybau 1

What is the empirical formula of chromium oxide?

2007-06-07 10:52:34 · 3 answers · asked by jasonanthonybau 1

2007-06-07 10:49:49 · 5 answers · asked by R C 2

What's the concentration of the sulfate ion SO4-2, in a .50 M solution of Al2(SO4)3? Explain in a step by step process in a easy way.

2007-06-07 10:48:49 · 2 answers · asked by Anonymous

In its first step of ionization, h3po4 yields h+. why is the answer h2po4?

2007-06-07 10:44:01 · 1 answers · asked by Anonymous

2007-06-07 10:32:41 · 1 answers · asked by VirgoOne 1

2007-06-07 10:26:21 · 8 answers · asked by sdgnjksjfksn 1

I am looking for any chemistry based companies in huddersfield. Hudddersfield is in the United Kingdom up north in west yorkshire. I am looking to volunteer during the summer to gain work experience either as a lab technician, researcher, just any thing to do with chemistry. If you know a company please let me know. Thank you

2007-06-07 10:20:50 · 1 answers · asked by aquino m 1

given the equation for the reaction H2+Cl2-->2HCL,
how many grams of HCl will be formed from 2.00 liters of chlorine at STP.

what steps would you take to solve this problem?

2007-06-07 09:31:58 · 3 answers · asked by ? 2

can i have a symbol equation for this reaction?

2007-06-07 09:30:11 · 1 answers · asked by Anonymous

I have a chem question which says :
Which of the following structures are isomers?
There are 5 structures which I cannot do on here but how do I know if it's an isomer?
eg. of one is CH3-CH2-CH-CH2-CH3 with one going upwards from the CH in the middle -CH3

2007-06-07 09:28:25 · 3 answers · asked by flowers4eden 1