Chemistry - January 2007

if u wish to dissolve a lump of sugar in water, give three ways u could increase the rate at which the sugar dissolves?
Explain why each procedure is effective.

2007-01-26 02:49:33 · 2 answers · asked by Hally berry 3

Explain why the rate of a simple chemical reaction such as
NO(g) + ½ O2(g) = NO2(g)
is likely to be most rapid at the beginning of the reaction.

plz asap!!!!

2007-01-26 02:48:44 · 2 answers · asked by Hally berry 3

Why is a sodium atom larger than a lead atom?

2007-01-26 02:02:49 · 5 answers · asked by Robert d 1

What is the relationship between the electron configuration for an atom and the atomic radius of the atom?

2007-01-26 02:00:50 · 4 answers · asked by Robert d 1

2007-01-26 01:09:08 · 2 answers · asked by suraj g 1

I have a quiz tomorrow on chem and this will serve as my reviewer help plzz..thnx


1. Temperature at which the
solid and liquid phases of a
substance can exist together.
2. Temperature at which the
vapor pressure of a liquid is
equal to atmospheric pressure
3. Substance that can transmit
electricity
4. One form of describing the
concentration of a solution
5. Describes any system in
which two changes that
oppose each other are
occurring at the same rate.
A. Boiling point
B. Conductor
C. Equilbrium
D. Freezing point
E. Molality

(16.1) 1210. A solution of sodium chloride is a
A. heterogeneous compound C. heterogeneous mixture
B. homogeneous compound D. homogeneous mixture
(16.1) 1211. Which applies to the dissolved particles in a solution|?
A. They can be seen with a hand lens.
B. They are large enough to scatter light
C. They will settle out of solution when left standing.
D. They will settle out of solution when left standing.
E. They are in the same phase as the solvent.
......

2007-01-26 01:06:22 · 4 answers · asked by blue_skies 2

The question says supply the correct product (be sure to write the formula correctly) and then balance by adding coefficients

2007-01-26 00:50:43 · 4 answers · asked by w b 1

2007-01-26 00:43:49 · 6 answers · asked by mahesh b 1

i want to melt down a 10 k ring, how much borax should i use?

2007-01-26 00:19:21 · 1 answers · asked by Anonymous

2007-01-25 23:28:26 · 3 answers · asked by .prc to .pdf 1

2007-01-25 22:56:26 · 3 answers · asked by robbob 5

Also, when the wax burns, is it a physical or chemical change?

2007-01-25 22:30:48 · 10 answers · asked by pinkballoffur 1

2007-01-25 22:18:55 · 5 answers · asked by bravo b 1

What is the chemical reaction responsible?

2007-01-25 21:51:47 · 21 answers · asked by robbob 5

does anybody know what kind of structures these are likely to have and the nature of the bonds in the oxides that are formed when they react with excess oxygen?

I'm stuck on Potassium,
Selenium,
Nitrogen and
Calcium

Thanks

2007-01-25 21:38:22 · 3 answers · asked by helenlouisewelsby 1

of these anywhere can someone help with how to draw out the displayed formulae?

I've got

2 - bromo - 3 - methylhexane

and

2,2 - dimethyl - 4 - ethyloctane

i'm really stuck on this. Thanks

2007-01-25 21:27:44 · 4 answers · asked by Anonymous

Please I Need the atomic no.,Mass no.&the latin Symbol of Plutonium

2007-01-25 20:58:34 · 4 answers · asked by Gouda 1

2007-01-25 20:58:18 · 11 answers · asked by karen f 1

2007-01-25 18:41:27 · 3 answers · asked by badja 1

2007-01-25 18:38:53 · 3 answers · asked by badja 1

2007-01-25 18:37:28 · 2 answers · asked by Anonymous

in turning cyclohexanol into cyclohexene, we use E1 reaction...wat r d possible basic groups we could use???

2007-01-25 18:27:57 · 3 answers · asked by john m 1

why is it that we prefer to use phosphoric acid than sulfuric acid?

2007-01-25 18:26:09 · 3 answers · asked by john m 1

a. order
b. enthalpy
c. turnover number
d. activation energy

2007-01-25 18:16:16 · 7 answers · asked by Jason 4

CDCl3 is a common solvent used for NMR analysis. It is used because most compounds will dissolve in it, it is volatile and therefore easy to get rid of, and it is non-reactive and will not exchange its deuterium with protons in the molecule being studied. It is also "silent" in the NMR and will not show peaks to interfere with the analysis of the compound of interest. However, whenever CDCl3 is used as an NMR solvent, a small singlet is always observed at 7.26 delta. What is this peak due to????

2007-01-25 18:12:30 · 3 answers · asked by Puri 2

2007-01-25 17:32:53 · 2 answers · asked by Anonymous

is it still K(NO3) or does the soluble change it

2007-01-25 17:02:31 · 4 answers · asked by Anonymous

Steam expands in a cylinder with a sliding piston in a steam engine. The resisting pressure, Pext, is
78947 Pascals, the volume changes from 187.5 L to 89.2 L, and 3550 J of energy is lost to the surroundings as heat. Calculate the change in energy of the steam in Joules.

2007-01-25 16:47:28 · 1 answers · asked by Luisa Q 1

2007-01-25 16:13:16 · 6 answers · asked by shelia c 1

Please tell about it using isotopes.
Thank you so much!

2007-01-25 16:12:34 · 6 answers · asked by Anonymous