Chemistry - March 2007

2007-03-26 21:42:40 · 14 answers · asked by TJ 2

tlc-thin layer chromatography

2007-03-26 21:41:55 · 1 answers · asked by mousi 1

all atoms consists of electrons,protons and neutrons.atoms also share their electrons.so what fundamentaly decides the properties and charecteristics of each element?an atom X has 12 electrons.atom Y has 10.while attaining octet atom X loses 2 electrons from its valence shell.now it has only 10 electrons.wont it show properties similar to atom Y now?

2007-03-26 21:37:42 · 5 answers · asked by ashwathyvenugopal 1

How can I work it out?

2007-03-26 21:34:42 · 2 answers · asked by Anonymous

What are the relationships between the molecular structures of B-carotene and a-chlorophyll??

What features of these two compounds are responsible for their color??

To what calss of hydrocarbons do the carotenes and lypopenes belong??

Do the names of these compounds indicate their chemical classification??

2007-03-26 20:49:53 · 1 answers · asked by Anonymous

Metals can be used to make cooking pots & wires.Suggest an explanation to why metals can be used to make the above.Explain atomic structure.

2007-03-26 20:37:36 · 2 answers · asked by Anonymous

2007-03-26 20:28:42 · 1 answers · asked by Lost 3

2007-03-26 19:50:59 · 1 answers · asked by richie k 1

2007-03-26 19:41:01 · 1 answers · asked by Anonymous

2007-03-26 19:22:57 · 5 answers · asked by summer 1

When a freshly cut piece of sodium metal, Na, is dropped into a flask with chlorine gas a violent reaction takes place creating a compound. This compound



a. has properties that are more like Na than Cl.

b. has properties that are more like Cl than Na.

c. has properties that are totally unlike either Na or Cl.

d. has properties that are like both Cl and Na.

2007-03-26 18:38:34 · 4 answers · asked by Rachel r 2

I need the tempreture of the reaction . Thanks

2007-03-26 18:34:12 · 1 answers · asked by meshavi 1

Suppose I have 100g of calcium bicarbonate, how many mEq do I have?

2007-03-26 18:13:01 · 4 answers · asked by justine d 2

Chemistry question, i'm having difficulty figuring it out...

2007-03-26 18:13:00 · 2 answers · asked by ehriikah 3

Ho will it affect the preparation?
Q:2.What happens if the hot contents of the flask after the preparation of SO2 gas are thrown into the sink?

2007-03-26 18:05:03 · 5 answers · asked by ? 1

2007-03-26 17:56:12 · 1 answers · asked by Anonymous

What is the number of electrons in a chloride atom cl- ?

2007-03-26 17:54:32 · 5 answers · asked by Rachel r 2

1. What a balanced equation for sodiumazide?

2. Write the balanced chemical equation for a reaction bewteeen sodium metal and postassium nitrate?

I don't know how to start, can you please explain with details.

2007-03-26 17:36:21 · 1 answers · asked by Azumi 2

This question stems from a Chromatography lab, so basically its asking what force would move the ionic component up the chromotography paper....i think.

2007-03-26 17:35:24 · 1 answers · asked by Kristy 2

A solution of acetic acid is 2.0% dissociated at 25.0 oC. What was the original concentration ( in M) of the acetic acid solution? The Ka at 25.0 oC for acetic acid is 1.8 × 10-5.

2007-03-26 17:29:03 · 1 answers · asked by Anonymous

because detergent is alkaline,i wonder how to solidify alkaline so that the water would be much more cleaner

2007-03-26 17:23:32 · 1 answers · asked by iamdud2003 1

i want details about ortho, para & meta isomers

2007-03-26 17:22:15 · 2 answers · asked by mohd a 1

2007-03-26 17:14:21 · 1 answers · asked by Lana 1

My molecule is sulfur hexachloride (SCl6) I have to build a molecular model, I already did that, it was easy. But I also have to find at least 3 physical properties such as melting point, boiling point, state of compound at room temperature (solid, liquid, gas), color or smell, etc. and I have to state one practical use of my molecule. The problem is that I have looked for a long time and I can't find any information. Please Help!

2007-03-26 17:09:20 · 3 answers · asked by sg 3

anything about it? Is every persons chemical makeup just the same, if so why? If it is not how can it be different? How variable can it be?

2007-03-26 16:51:42 · 5 answers · asked by Friend 6

This is regarding a lab, that's why it refers to "you"
-You are expected to use a 35cm^2 piece of aluminium from a pop can. What is the average thickness of such beverage cans if you have 1.00 gram of metal from this piece?
Please explain if you can, I'm not sure which steps to take.

2007-03-26 16:43:15 · 3 answers · asked by universitystudent 2

Consider the decarboxylation of calcium carbonate.
CaCO3(s) <--> CaO(s) + CO2(g)
calculate the equilibrium pressure of CO2 at the following temperatures
a) 295 K
b) 1100 K

2007-03-26 16:39:12 · 1 answers · asked by vntraderus88 1

Does anyone know interesting ways elements have been used or are being used?

2007-03-26 16:35:11 · 1 answers · asked by Anonymous

basically do buffers neutrilize the addition of acids by neutrilizing it with the anion of the acid's salt within the buffer? and it neutrilizes the addition of base by the acid in it producing H+ ions? thanks

2007-03-26 16:29:42 · 2 answers · asked by Anonymous

I need to come up with words from the symbols on the periodic table. For example, CHOCoLaTE or AmErICa.
If you can find any words, please write them down! thank you!!

2007-03-26 16:27:49 · 2 answers · asked by showbiz101 1