Chemistry - July 2007

2007-07-25 03:37:31 · 3 answers · asked by Anonymous

helium
hydrogen
iron
uranium

2007-07-25 03:35:35 · 3 answers · asked by Anonymous

artificial radiation sources
atmospheric radon
cosmic rays
terrestrial radiation

2007-07-25 03:34:49 · 3 answers · asked by Anonymous

Different isotopes are useful in different dating processes. Suppose we wished to determine the age of an object which we suspect to be approximately 100 years old. An isotope with which of the following half-lives would be most appropriate for this project?

5 years
50 years
500 years
5,000 years

2007-07-25 03:01:28 · 6 answers · asked by kevin c 1

Describe what you would observe if you placed an Ag strip in an aluminum nitrate solution, Al(NO3)3. Thanks!!!!

2007-07-25 01:29:53 · 3 answers · asked by Anonymous

2007-07-25 01:19:10 · 4 answers · asked by Anonymous

Are:

Elements made up of Molecules which are made up of atoms
or what? Can you give me the correct order?

Thx and May God bless you.

2007-07-25 00:50:04 · 6 answers · asked by sguy 1

plzzz tell quickly i m in trouble.....plz tell atleast 7 or 8 points

2007-07-25 00:42:15 · 8 answers · asked by carlito_cool_2005 1

According to my knowledge,volatile means B.P. less than 373K and non volatile means B.P. more than 373K.Is it right to say like this ?

2007-07-25 00:40:22 · 3 answers · asked by Rajchem 2

we know that sodium reacts with with cold waterb to produce sodium hydroxide.does the same reaction follow with even steam?

2007-07-24 23:50:23 · 5 answers · asked by LAXMI U 1

i know it uses sugar and yeast.. but what is the step by step process of doing it?

2007-07-24 23:33:01 · 2 answers · asked by mae 2

I noticed elena torch-worked her glass, and thought she might be able to help?

2007-07-24 23:22:24 · 2 answers · asked by Glassman 1

on heating this salt changes from green to black?which salt is this?

2007-07-24 22:59:39 · 1 answers · asked by Neha B 2

2007-07-24 22:43:23 · 3 answers · asked by Anonymous

what kind of intermolecular forces are responsible for the aggregation of hemoglobin molecules that leads to sickle cell anemia?

2007-07-24 22:35:43 · 1 answers · asked by afif_maxim 1

Element X reacts with chlorine to form a compound with formula XCl2. The oxide of element X is basic. Element X is


A) Ca
B) Rb
C) P
D) H
E) Al

2007-07-24 22:13:20 · 7 answers · asked by ~daweed~ 3

2007-07-24 22:00:57 · 2 answers · asked by tillb = 1

give all the equations, is CO2 evolved

2007-07-24 21:30:13 · 5 answers · asked by dushyant 1

A)1s2 2s2 2p2
B)1s2 2s2 2p2 3s2
C)1s2 2s2 2p1
D)1s2 2s2 2p4
E)[He]2s2 2p4


The second number after the letter is a superscript, sorry if it looks confusing!

2007-07-24 21:24:25 · 4 answers · asked by ~daweed~ 3

A) sulfur
B) selenium
C) sodium
D) carbon
E) nitrogen

2007-07-24 21:21:11 · 3 answers · asked by ~daweed~ 3

The valence shell of the element X contains 2 electrons in a 5s subshell. Below that shell, element X has partially filled 4d subshell. What type of element is X?

A) representative
B) transition metal
C) halogen
D) alkali metal
E) alkaline earth metal

2007-07-24 21:17:13 · 1 answers · asked by ~daweed~ 3

In terms of the flow-scheme for the identification of unknowns, which of the following test sequences would be appropriate for 2-butanol?

1) Chromic acid - Iodoform
2) 2,4-Dinitrophenylhydrazine - Chromic acid - Iodoform
3) 2,4-Dinitrophenylhydrazine - Lucas - Chromic acid
4) 2,4-Dinitrophenylhydrazine - Beilstein - Bromine - Chromic acid - Lucas

anyone has idea?thank you

2007-07-24 20:57:59 · 1 answers · asked by ichigokun 1

In terms of the flow-scheme for the identification of unknowns, which of the following test sequences would be appropriate for 3-pentanone?

1) Chromic acid - Iodoform
2) 2,4-Dinitrophenylhydrazine - Tollens - Iodoform
3) 2,4-Dinitrophenylhydrazine - Chromic acid - Iodoform
4) Iodoform

anyone has any idea?thank you

2007-07-24 20:57:01 · 1 answers · asked by ichigokun 1

2007-07-24 20:21:47 · 1 answers · asked by Simona Sekulova 1

2007-07-24 20:20:27 · 1 answers · asked by Simona Sekulova 1

CaCO3(s)=CaO(s)+CO2(g)
If 4.74 g of calcium carbonate is heated what volume of CO2(g) would be produced when collected at 26C and .997 atm?
Please show me how you got this.TY

2007-07-24 19:34:24 · 4 answers · asked by susanstudio2000 1

6.91 grams of N2, 4.71 grams of O2 and 2.95 G of He
Please show me how you did this as I did this and totaled up everything and my answer isn't jiving w/ the back of the book.
TY

2007-07-24 18:30:51 · 4 answers · asked by susanstudio2000 1

2Al + 3Br2→ 2AlBr3

AlBr3 is reduced and Br2 is oxidized.
Al is reduced and Br2 is oxidized.
Al is oxidized and Br2 is reduced.
AlBr3 is oxidized and Al is reduced.
AlBr3 is reduced and Al is oxidized.

2007-07-24 18:13:17 · 1 answers · asked by lpatt949 1

How would i answer this question?


*What would be the LD50 for a body mass of 100 lbs? (4.07g/kg)

2007-07-24 18:12:30 · 1 answers · asked by baby_princess_melissa 2

Please help me. I need to know the names and properties of these 3 types of carbon-oxygen molecules.
Please try to answer as simply as possible because I am not very intelligent :P

I would really appreciate it if useful links are included.

2007-07-24 17:57:31 · 2 answers · asked by Anonymous