Chemistry - February 2007

How many calories are needed to bring 150 grams of water @ 75°C to vapor at 110°C.

Best answer gets 10pts.

Use: http://www.emsc.nysed.gov/osa/reftable/esp1-7.pdf

2007-02-24 05:50:27 · 3 answers · asked by Zinadeen Z 2

6 hydroxy 5 (2 methoxy 5 methyl 4 sulfophenylazo) 2 naphtalenesulfonic acid sodium salt

2007-02-24 05:46:25 · 3 answers · asked by globbermouth 2

Mixture of amylose/amylopectin in a 1:3 ratio (based on polymer chains of glucose)

2007-02-24 05:45:57 · 2 answers · asked by globbermouth 2

A solution of 100.0 mL of 0.200 M KOH is mixed with a solution of 200.0 mL of 0.150 M NiSO4.

(a) Write the balanced chemical equation for the reaction that occurs.

NiSO4(aq) + KOH(aq) ----->

(b) What precipitate forms?


(c) What is the limiting reactant?


(d) How many grams of this precipitate form?


(e) What is the concentration of each ion that remains in solution?

Ni2+

K+

SO42-

2007-02-24 05:43:31 · 3 answers · asked by Ham Wallet 1

i mean is there like a formula or smth to calculate how many isomers an organic compound will have?

2007-02-24 05:26:24 · 3 answers · asked by sianz 2

2007-02-24 05:09:09 · 4 answers · asked by henry f 2

bromine gas, a non-polar molecule
chlorine gas, a non-polar molecule
potassium bromide, a polar molecule

2007-02-24 05:08:20 · 4 answers · asked by clock 2

I need to find a website that has the periodic table of elements so I can print it out. I don't need too much information on there, all I need is the symbol and the full name of the elements.

2007-02-24 05:07:41 · 7 answers · asked by Anonymous

Iron Sulphate is made on a larger scale for fertillisers than it is as a pharmaceutical, any help will be greatly appreciated, thanks

2007-02-24 04:58:15 · 4 answers · asked by Anonymous

A 295-g aluminum engine part at an initial temp. of 3.00 degrees celsius absorbs 85.0 KJ of heat.
(c of Al=0.900 J/g K)

2007-02-24 04:52:43 · 3 answers · asked by stardust6547 2

2007-02-24 04:32:46 · 2 answers · asked by Anonymous

2007-02-24 04:06:45 · 3 answers · asked by frickenawesomekoreanandyouknowit 2

2007-02-24 03:54:04 · 2 answers · asked by Anonymous

I have a 200mL water sample from a river. I heated it up until it reaches a minimum concentration. Then I transferred the small volume to a 100mL volumetric flask and filled it with deionized water until the total volume reached 100mL. Then I analyzed it using Flame Atomic Absorption Spectrophotometry for it's lead absorbance. I already calculated the concentration based on a calibration graph that I made. But how do I use that concentration to calculate for the actual concentration in the 200mL sample, accounting for the volume changes?

2007-02-24 03:53:11 · 1 answers · asked by furfur 1

It is not a number.

2007-02-24 03:46:32 · 7 answers · asked by Anonymous

In one SiO2, one Si is joined to 4 oxygen atoms. Why is there 4 oxygen and not 2 as the formula is SiO2?

2007-02-24 03:35:37 · 4 answers · asked by oxired 1

Problem: A simple rule states that the reaction rate changes by a factor of 2 or 3 due to a temperature increase of10K. Calculate EA using this rule.
Thats all it says... is this a typo in my script or is my professor really just whack?

2007-02-24 02:57:47 · 3 answers · asked by Hans B 5

when doing mass to mass conversions of different elements/compunds how would you set it up to get the answer?

2007-02-24 02:54:21 · 2 answers · asked by ♥INTENSENESS♥ 2

Assuming no volume change, how much NaOH must be added to make the best buffer?
A.10.0g
B. 5.0g
C. 15.0g
D. 20.0g
E. none of these

please provide explanation
i cant figure out buffers for myl ife

2007-02-24 02:20:57 · 2 answers · asked by galdon885 1

At what pH is this color change visible?
A. 7.88
B. 3.85
C. 10.2
D. 6.15
E. none of these

please provide explanation

2007-02-24 02:07:35 · 2 answers · asked by galdon885 1

2007-02-24 01:23:49 · 3 answers · asked by mrs. 김재중 2

osmotic pressure of the solution?

2007-02-24 01:17:16 · 3 answers · asked by mrs. 김재중 2

2007-02-24 01:11:34 · 3 answers · asked by mrs. 김재중 2

2007-02-24 01:05:35 · 6 answers · asked by mrs. 김재중 2

2007-02-24 00:41:41 · 4 answers · asked by sikirutaye 1

2007-02-24 00:40:27 · 1 answers · asked by sayeeda 1

2007-02-24 00:18:32 · 4 answers · asked by paritosh 2

2007-02-24 00:16:15 · 8 answers · asked by PRATYUSHA G 1

2007-02-24 00:11:27 · 4 answers · asked by PRATYUSHA G 1

For every element, less energy is needed to remove an electron from a neutral atom than is needed to remove another electron from the resultant ion. Explain why..

2007-02-23 22:45:33 · 2 answers · asked by enigma 1