Chemistry - July 2007

2007-07-17 20:38:37 · 3 answers · asked by Simona Sekulova 1

2007-07-17 19:42:37 · 3 answers · asked by pallavi m 2

2007-07-17 17:55:14 · 3 answers · asked by Fatema D 1

Hydrogen peroxide is occasionally used as a contact solution. If the hydrogen peroxide comes in contact with your eyes, it is obviously very painful so the hydrogen peroxide is placed in a container with the contacts along with a disk which over 6 hours time neutralizes the solution and it becomes just unpreserved saline solution. Chemically, how does this process work?

2007-07-17 17:14:15 · 2 answers · asked by Anonymous

Examine the versatility of carbon through the compounds it forms with hydrogen. Examine also how the structure and types of bond found in these compounds give rise to their properties

2007-07-17 16:39:49 · 3 answers · asked by Leo 1

2007-07-17 15:39:12 · 2 answers · asked by Double Dee 2

my hot tub/ spas' chemical balance is off. Does anyone know how and or what chemicals to use to
1.raise the total alkalinity
2. raise the calcium hardness.
this is a 500 gal tub.

2007-07-17 15:03:56 · 3 answers · asked by Anonymous

in which you can see why some metals disolve in acid befire others. ex. zinc disolves before copper

2007-07-17 14:48:32 · 3 answers · asked by Me not u 2

Hydrogen is explosive. Oxygen helps a fire burn. Waters made of Hydrogen and Oxygen, so why doesn't water burn?

2007-07-17 13:06:15 · 19 answers · asked by Geoff E 4

2007-07-17 11:37:18 · 1 answers · asked by Anonymous

will it still work? my mom baught the wrong kind

2007-07-17 11:08:28 · 5 answers · asked by Anonymous

2007-07-17 10:41:59 · 5 answers · asked by lord_andys_new_id 1

2007-07-17 09:01:01 · 1 answers · asked by Anonymous

2007-07-17 08:57:02 · 2 answers · asked by Anonymous

when I gave them old fashioned popcorn, made in a pop corn popper, all was fine and they totally LOVED it..but I gave them some microwaved popcorn and it totally sizzled when it hit the water
Does anyone know what caused the sizzle sound?

2007-07-17 08:09:58 · 3 answers · asked by Anonymous

in all cases the rate of reaction decreases
in virtually all cases the rate of reaction decreases
in all cases the rate of reaction increases
in virtually all cases the rate of reaction increases

2007-07-17 07:51:43 · 3 answers · asked by Anonymous

it decreases the activation energy of the reaction
it increases the number of collisions between reacting molecules
it makes the reaction more endothermic
it makes the reaction more exothermic

2007-07-17 07:49:59 · 7 answers · asked by Anonymous

ionic bonds are weak
no covalent bonds need to be broken for reaction to occur
reactions between ions are endothermic
reactions between ions are exothermic

2007-07-17 07:48:59 · 1 answers · asked by Anonymous

the energy of the products is lower than that of the reactants
the energy of the transition state is higher than that of the reactants
both (a) and (b) are true
both (a) and (b) are false

2007-07-17 07:39:04 · 1 answers · asked by Anonymous

For the reaction 2NO2(g) ì N2O4(g) at 325 K equilibrium is established when [N2O4] = 0.020M and [NO2] = 1.08 ´ 10- 2M. What is the equilibrium constant for this reaction?

5.8 x 10^-3
2.9 x 10^-1
5.4 x 10^-1
1.7 x 10^2

2007-07-17 07:38:28 · 2 answers · asked by Anonymous

2007-07-17 07:34:22 · 3 answers · asked by brian b 1

2007-07-17 07:32:43 · 8 answers · asked by Anonymous

please specify the physical propertiws also

2007-07-17 07:02:41 · 4 answers · asked by riyas_rb 1

the energy of the products is lower than that of the reactants
the energy of the transition state is higher than that of the reactants
both (a) and (b) are true
both (a) and (b) are false

2007-07-17 06:44:22 · 1 answers · asked by Anonymous

ionic bonds are weak
no covalent bonds need to be broken for reaction to occur
reactions between ions are endothermic
reactions between ions are exothermic

2007-07-17 06:33:24 · 2 answers · asked by Anonymous

In the beginning of term I slacked off a lot.
Now I have to do a lot of work to catch up, and I really need an A on this course.
What are efficient ways of catching up? I certainly can't and don't want to read all the pages in the textbook. Thx.

2007-07-17 05:53:35 · 7 answers · asked by Anonymous

I know there is another name for it, I just can't think of it. Can someone help me out.

2007-07-17 05:48:33 · 4 answers · asked by Ashie 1

2007-07-17 05:32:15 · 5 answers · asked by Anonymous

2007-07-17 05:29:39 · 3 answers · asked by gunju 1

Are butylamine and dibutylamine soluble in petroleum ether? my lab results show that when butylamine is added to petroleum ether, it floats but dissolve after a while. why is it so? and why doesnt dibutylamine dissolve in petroleum ether?

2007-07-17 05:27:40 · 2 answers · asked by bLacksn0w 1