Chemistry - September 2007

2007-09-05 13:43:42 · 6 answers · asked by Sayler M 2

why is it not useful in nuclear medicine?

2007-09-05 13:42:21 · 1 answers · asked by Buttrefly-Beauty 2

2007-09-05 13:41:09 · 2 answers · asked by Sayler M 2

to the next upper energy level.so imagine a black paint on a car in the sun being heated up.
so the sun gives electrons,and the paint atoms consume it and the electrons in the atoms of the paint go to the next energy level..right
so if it goes to next energy level it gains energy
so how is that we feel the heat .because according to the thery heat is given out only when energy is lost


im really confused about this

2007-09-05 13:40:25 · 2 answers · asked by ppohyhh 1

Determine the quantity (mg/L) of sodium hypochlorite (NaOCl) that would be required to oxidize 0.5 mg/L of ferrous ion (Fe2+) according to the following reaction:

2 Fe2+ + NaOCl + 2 H+ 2 Fe3+ + Na+ + H2O + Cl-

2007-09-05 12:45:24 · 1 answers · asked by crazyboy496 1

The density of 2-propanol is 0.79 g/mL at 25 degrees Celsius
The density of water is 1.00 g/mL at 25 degrees Celsius. What qualitative observations could you expect to make if these two substances were mixed together?

Thanks so much!

2007-09-05 12:14:39 · 2 answers · asked by Baby facee 1

need it today.. pls help

2007-09-05 12:01:42 · 1 answers · asked by bryan 2

thanks..xD

2007-09-05 11:24:55 · 3 answers · asked by crescentbangs 2

is it homogeneous or heterogeneous substance?

a- iron ore
b- quartz
c- granite
d- energy drink
e- salt
f- rainwater
g- nitrogen


is it phsical or chemical change?

a- metal burning
b- gas pressure increasing
c- liquid evaporation



plzzzzzzzzzz help

2007-09-05 10:50:02 · 4 answers · asked by help 1

how ?

2007-09-05 10:47:23 · 4 answers · asked by fds 3

in the chemical formula for calcium hydroxide, Ca(OH)2, why are the oxygen and hydrogen molecules together in parentheses??
this is just the way my teacher presented it to my class.

2007-09-05 10:42:44 · 6 answers · asked by »-(¯`v´¯)-» xox 2

2007-09-05 10:23:57 · 3 answers · asked by bumblebee 4

Is it.....

a. a molecule
b. an antioxidant
c. a compound
d. a buffer
e. a chemical element

2007-09-05 10:22:42 · 4 answers · asked by San Fran Kid 2

give me as much info about it as possible.

2007-09-05 10:10:02 · 7 answers · asked by Anonymous

2007-09-05 10:08:50 · 3 answers · asked by sasuke_raven 1

2007-09-05 09:53:50 · 1 answers · asked by whisper2ya 2

Titanium has a density of 4.50 g/cm^3
A pure titanium cube has an edge length of 2.64 in.

2007-09-05 09:43:16 · 1 answers · asked by twistacm 1

Were to find on the internet the Periodic Table of Mendeleev that has in every square the name of element the short name the atomic number ????? Please need for school starts in 17 or 14 septembre . To print it . Need for portofoliu at chemistry.Don't know if I said good in english.

2007-09-05 09:12:34 · 5 answers · asked by dragoi_stefan06 2

2007-09-05 08:32:49 · 3 answers · asked by Anonymous

I am taking a chemistry class towards my BSN and the instructor posed a question to us before the end of class last week and it was: What is the correlation between the boiling point of water and the properties of a bullet proof vest? I have searched on yahoo and found something about intermolecular changes but I want an expert on the subject to help me out it was not an assignment but I just want to impress the instructor with the correct answer. Thanks in advance.

2007-09-05 07:54:43 · 4 answers · asked by nurserenae 4

Orage Juice 3.84
Apple Juice 3.47
Black tea 6.37
black coffee 5.51
lemon tea 3.73
coke 2.61
pepsi 2.63
milk 6.76
water 6.93

2007-09-05 07:40:57 · 3 answers · asked by maricelasllr 1

2007-09-05 07:15:40 · 1 answers · asked by lovablechiquita 1

Only one isotope of this element occurs in nature. One atom of this isotope has a mass of 9.123x10^-23g. Identify the element and give its atomic mass.

2007-09-05 06:30:52 · 3 answers · asked by live in the moment 2

At what strength does hydrochloric acid fume. When I did some research, I noticed that the literature refered to 36% HCl and stronger as "fuming". What determines if the HCl will fume? Does it have to do with vapor pressure of the water and the HCl?

2007-09-05 06:08:36 · 4 answers · asked by Skrap 3

Which of the following reacts at the fastest rate with potassium methoxide(KOCH3) in methanol?
1) fluorobenzene
2) 4-nitrofluorobenzene
3) 2,4-dinitrofluorobenzene
4) 2,4,6-trinitrofluorobenzene

2007-09-05 05:55:12 · 2 answers · asked by raj p 1

which of the following works best as a base to quantitatively convert ethyl acetate, CH3CO2CH2CH3, to its enolate?

1) NaOH
2) KOC(CH3)3
3) CH3Li
4) [ (CH3)2CH]2NLi

2007-09-05 05:33:34 · 3 answers · asked by Anonymous

2007-09-05 04:05:09 · 4 answers · asked by Anonymous

i clean my dogs cage with bleach is this bad doesnt that make mustard gas or not i use it diluted like 1/4 of a cup to 1 gallon of water but today the bleach a little spilled

2007-09-05 04:01:09 · 2 answers · asked by Anonymous

2007-09-05 04:00:45 · 6 answers · asked by jamet002 2

2007-09-05 03:57:12 · 1 answers · asked by whisper2ya 2