Chemistry - February 2007

electron,matter,proton,element,electron theory,atom,nucleus,insulation

2007-02-26 04:54:59 · 6 answers · asked by elbaby232002 1

i know you can change surface tension of water with a surfactant. i need to know what can change the surface tension and how to show that it has changed (made up example: if i had water without a surfactant then oil would float but with a surfactant the oil would sink)

2007-02-26 04:33:43 · 2 answers · asked by Anonymous

what is the common name for soddium chloride?

2007-02-26 04:24:23 · 9 answers · asked by mallukutti 2

How does the pH of a 0.20 M solution of NaHCO3 compare to that of a 0.10 M solution of NaHCO3?


A. It is 2 times as high.
B. It is half as much.
C. It is the same.
D. cannot be determined with the Ka values
E. none of these

2007-02-26 04:22:49 · 1 answers · asked by Anonymous

2007-02-26 04:00:49 · 4 answers · asked by jasween k 1

2007-02-26 03:58:33 · 5 answers · asked by jasween k 1

2007-02-26 03:55:15 · 1 answers · asked by Narissa J 2

2007-02-26 03:45:19 · 5 answers · asked by Amir 2

(a) How many milliliters of a stock solution of 15.0 M HNO3 would you have to use to prepare 0.500 L of 0.200 M HNO3?
________ mL
(b) If you dilute 15.0 mL of the stock solution to a final volume of 1.00 L, what will be the concentration of the diluted solution?
_______ M

2007-02-26 03:43:47 · 1 answers · asked by lsubetty 2

2007-02-26 03:41:18 · 1 answers · asked by Anonymous

A sample of liquid nitrogen trichloride was heated in a 2.55 L closed reaction vessel until it decomposed completely to gaseous elements. The resulting mixture exerted a pressure of 787 mmHg at 73°C.


What was the mass of the original sample?

2007-02-26 03:22:28 · 1 answers · asked by pinay804 2

1. AlPO4= aluminum phosphate
2. Cu2S= Copper(I) sulfide

sorry for all the ?s but my net has been down now i just have a short time before class to get it done.

2007-02-26 03:20:05 · 3 answers · asked by mrs. me 2

I did think i knew the answer but turns out i didn't, can anyone help me out.

Much appreciated.

2007-02-26 03:14:47 · 6 answers · asked by Anonymous

A. Microwaves
B. x-rays
C. radio waves
D. Infrared radiation
E. Gamma rays

2007-02-26 03:03:52 · 7 answers · asked by galdon885 1

A. Fusion: 2over1 H + 2over1H ---> 3over1 H + 1over1 H
B. Bombardment: 239over94 Pu + 1over0 n ---> 240over95 Am + 0over-1 e
C. Beta production:239over92 U --> 239over93 Np + 0over-1 e
D. fission: 209over83 Bi + 4over2 He ---> 211over85 At + 2 1over0 n
E. all are correctly labeled.


please provide explanation

2007-02-26 02:56:08 · 2 answers · asked by galdon885 1

2007-02-26 02:51:56 · 3 answers · asked by thirteen 1

2007-02-26 02:38:01 · 11 answers · asked by lynn 5

2007-02-26 02:29:05 · 6 answers · asked by shashafernandez 2

what causes the temperature change?

2007-02-26 02:27:52 · 2 answers · asked by dan 2

does it add neutron/proton ? can you pls explain what will happen. pls? :D thanks

2007-02-26 02:21:56 · 2 answers · asked by Angelica 1

I really need some help on this... Which is better? And if e mentos effect is better, what can I do to make the cola look more like lave errupting? Please a.s.a.p somebody!

2007-02-26 01:51:02 · 3 answers · asked by Anonymous

How do i find the molar solubility of lead chromate in 0.10 M nitric acid if the Ksp for PbCrO4 is 3.0e-7?

2007-02-26 01:45:37 · 1 answers · asked by derrick-fish 1

2007-02-26 01:41:37 · 2 answers · asked by ice 1

2007-02-26 01:37:51 · 8 answers · asked by elvgrenfan 1

for skool thanks

2007-02-26 01:23:50 · 9 answers · asked by Anonymous

Hi

If I wanted to make a 40cm3 salt solution from 2.0M salt, do I pur out 20cm3 of the 2.0M salt and dilute it with 20cm3 of water?
Sorry to ask probably a stupid question, but it's been 16 years since my chemistry lessons at school and am taking an evening class in biology, not chemistry!

Thanks for your help

shetajan

2007-02-26 00:30:38 · 4 answers · asked by shetajan 1

anything other then baking soda !!
something else just to make it intersting

2007-02-26 00:01:33 · 5 answers · asked by hawt-b!tch 2

How many cu m of butterfat must be removed from 500 cu m of milk containing 10% butterfat to reduce its content to 4% butterfat?

2007-02-25 23:29:52 · 1 answers · asked by mary k 1

Why does Potassium come after Argon in the Periodic table, even though it has a relative atomic mass which is lower than that of argon?

Thank you. I really need to know.

2007-02-25 23:13:53 · 6 answers · asked by Ayumi.Jung 1

2007-02-25 23:11:05 · 6 answers · asked by wei jun 1