Chemistry - October 2007

with a hydroxide concentration of 3.7 x 10 ^-8(ten to the negative eighth). I got a pH of 7.4, but my friend said it was 6.6. Which one of us is right? And if it is 6.6, how did you get that?
Thanks

2007-10-30 13:29:12 · 1 answers · asked by lil bill 7 2

a mole is 6.02X10^23 by the way. here's the problem
there are 15,000 miles of road. for every 8ft. you need to put in a pole. How many moles of poles need to be ordered?

2007-10-30 13:28:53 · 2 answers · asked by Carmen 3

How do I calculate the pH of a solution containing .80 M lactic acid (HC3H5O3) and .20 M sodium lactate (NaC3H5O3) where lactic acid has a Ka value of 1.4 x 10^-4(ten to the negative four)?
Thank you!

2007-10-30 13:26:57 · 1 answers · asked by lil bill 7 2

why is an ionic compound noncondutive in its solid form but a good condutor of electticity???? and what other state is an ionic compound conductive???

2007-10-30 11:57:24 · 2 answers · asked by nichole 1

2007-10-30 11:56:13 · 1 answers · asked by hazeleyedgirl 1

what atoms are in copper family , and what are there shared characteristics?

2007-10-30 11:55:32 · 2 answers · asked by Anonymous

Please someone help me.

I've been seeing people say (CH3COO)2 is Acetate but the formula of Acetate that I have is C2H3O2.

Is there something that I'm missing?

2007-10-30 11:48:17 · 5 answers · asked by shadow_zeke_raven 2

Lead (II) nitrate is a poisonous substance which has been used in the manufacture of special explosives and as a sensitizer in photography. Calculate the mass of lead in 139 g of Pb(NO3)2.

2007-10-30 11:37:05 · 1 answers · asked by April 1

How many grams of SF6 should be added to a sample of 486 g SF6 to obtain 5 moles of the compound?
244 g
730 g
114 g
33 g
none of the above, as 486 g represents more than 5 moles


What I understand is 5 Mol of SF6 x (146.07 g SF6/ 1 mol SF6 ) = 730.2 g SF6

Now do you divide that? and get

244.2g

or is the answer 730.2g?

2007-10-30 11:35:36 · 2 answers · asked by April 1

The length of a table is measured to the nearest 1 cm and the value is found to be 100 cm. The clearest way to express this result is
100 cm
1 m
1.00 × 102 cm
1 × 102 cm
none of the above

I thought it could be either C or none of the above.. and I'm not sure I know 100. and 1.00 have the wrong sig figs..

2007-10-30 11:33:22 · 1 answers · asked by April 1

{Ar}...?

4s2 8p6?

2007-10-30 11:29:00 · 3 answers · asked by hgsaddgh 4

How was the element nitrogen named?
What is its natural state?
What is the melting point?
What is its boiling point?
What group does it belong to in the periodic table?(such as noble gases or metal etc)
What are some of its characteristics? if its dangerous or explosive etc
And if you can please provide a link for a nitrogen electron cloud model picture. Thank you in advance

2007-10-30 11:27:40 · 2 answers · asked by legenddael 2

2007-10-30 11:18:06 · 4 answers · asked by sona 1

elements have to have the same amount of protons and electrons in an atom, why can they have different amount of neutrons?

2007-10-30 11:13:55 · 2 answers · asked by Charli 1

How many protons, nuetrons, and electrons are in a oxygen atom?

2007-10-30 11:10:57 · 2 answers · asked by queenteen 1

I just need a brief report on it!! Why it should be.............!!!

2007-10-30 11:07:27 · 1 answers · asked by diya 1

for gypsum: (CaSO4·2H2O)

what does the dot between O4 and 2H mean?

2007-10-30 11:03:31 · 2 answers · asked by bleuespere 1

4 cesium I have these numbers.

6.2E-7 meters: 1.66E-20 Joules

With this how do I convert wavelengths to frequencies
My instructor told me to use f=v=c/lambda where c is the speed of light.
Can you guys b more specific and tell me exactly what to plug in where n stuff. THX ALOT

2007-10-30 10:23:33 · 2 answers · asked by Dhoopy 3

Ok...Chem 1 honors stuff here...So we are doing half lives and crap like that. Well I need to find the average of the first five on my graph. And I dunno how to do that. How do I do it?

2007-10-30 10:22:47 · 2 answers · asked by Anonymous

What would the balanced reaction be for 3-nitroaniline + HCl?

O2NC6H4NH2 + HCl ---> ? + H20?

2007-10-30 10:16:45 · 1 answers · asked by Karus 3

Can someone please help and do the problems to 2.1 will be apreciated, i will become your fan on yahoo or any other website you would like me too. i will rep you on youtube or anything like that. please help.
Link is below for the site the problems are thier. page: 19, problems 2.1, a simple model of the atom.

http://books.google.co.uk/books?id=ibFdfzSOdHYC&pg=PP3&dq=chemical+ideas&sig=jl45aCyV5xUAaKwm_a8mkRvoNM4&vq=%22Chemical+Ideas%22#PPA19,M1

2007-10-30 10:08:42 · 1 answers · asked by help 2

Science ?s suck!

2007-10-30 10:01:20 · 1 answers · asked by Anonymous

An analysis of an unknown compound found it contained 39.86 grams potassium, 28.04 grams chromium and 57.10 grams of oxygen.
Find the empirical formula.

My answer: K34Cr18O119
Can it be simplified? Is it possible I did the problem wrong?

Thanks so much!

2007-10-30 09:57:21 · 1 answers · asked by Anonymous

2007-10-30 09:48:51 · 1 answers · asked by Anonymous

Please answer! Thank you so much! Leave a source if you can. This is for school.

2007-10-30 09:39:53 · 5 answers · asked by Anonymous

Why is the Kelvin scale used for gas law calculations?

Will the volume of gas increasse, decrease, or remain the same if the temperature is increased and the pressure is decreased? explain

2007-10-30 09:38:15 · 1 answers · asked by Anonymous

calculate the frequencey and wavelength (nm) of the emitted photon when an electron drops from the n=4 to the n=2 level in a hydrogen atom?

2007-10-30 09:18:40 · 1 answers · asked by lacie_23_07 1

how do you separate salt water from fresh water

2007-10-30 09:04:49 · 3 answers · asked by Anonymous

Explain why the simple placement of a hydroxyl group in the building blocks of a polysaccharide can determine the digestibility of polysaccharides.

2007-10-30 08:07:50 · 1 answers · asked by Anonymous

2007-10-30 07:59:13 · 3 answers · asked by Amber H 1