Chemistry - January 2007

Example: If I have a gel compound inside of an enclosed sac and want this compound to reverse it's temperature when heat is detected such as by a warm hand.

Please source your answer, thanks!

2007-01-30 06:09:06 · 1 answers · asked by Krizno the Wolf handler 2

I was looking for a list of common compounds using only Carbon, Nitrogen, Oxygen, and/or Hydrogen, for education/game purposes. Once I have the names, I can find out the details, but going over every possibility would be impossible.

The largest size I was thinking of NH4N03- Ammonium Nitrate, and C2H60- Ethanol.

2007-01-30 05:54:44 · 2 answers · asked by Matthew H 1

need to know how to do this for a test

2007-01-30 05:35:39 · 2 answers · asked by mitch v 1

2007-01-30 05:35:16 · 2 answers · asked by srd_007 1

This question is for chemistry

2007-01-30 05:19:06 · 4 answers · asked by grace r 1

For example, the bond angles for C2H4 are all 120 degrees. How do I find that out?

2007-01-30 04:55:40 · 3 answers · asked by Mysara e 2

I`m just trying to find a easy way to find a source of methanol for a biodiesel project. On the same note could common caustic soda be used for the same job as chemical grade NaOH.

2007-01-30 04:51:44 · 2 answers · asked by strange_bike 2

Where does the air come from?

2007-01-30 04:32:23 · 7 answers · asked by bafler2005 1

please show proof of how

2007-01-30 04:22:54 · 4 answers · asked by Mysara e 2

Given the following data:


Fe3O4 + CO → 3FeO + CO2 DH = +38 kJ


2Fe3O4 + CO2 → 3Fe2O3 + CO DH = +59 kJ


Fe2O3 + 3CO → 2Fe + 3CO2 DH = −28 kJ




Calculate Delta H for the reaction


FeO + CO → Fe + CO2

2007-01-30 04:22:02 · 2 answers · asked by Anonymous

there is no air in the bottom of the pot, so where do these bubbles come from?

2007-01-30 04:08:44 · 3 answers · asked by wantme_comegetme 5

25 mL of a 0.075 M solution of a weak acid was titrated with 0.10 M NaOH. After the addition of 5.0 mL of NaOH the pH was 4.85.
a. What is the pKa of the weak acid?
b. If the solution at this point is diluted to 50 mL for use as a buffer, what is the
molar concentration of the buffer?

2007-01-30 03:55:02 · 2 answers · asked by teekay_33 1

I am in 9th grade and we've been told by the teachers that at equal temperature and pressure, two gases have the same volume, same number of molecules/atoms and are identical in structure..I didn't understand...
How can this work? I mean..how is it possible?

2007-01-30 03:51:28 · 4 answers · asked by Anonymous

Hey guys this is for my chem, so if anyone knows! Thanks! And please no stupid or smart-alike remarks!

2007-01-30 03:48:38 · 1 answers · asked by Angel 1

we had our chem final and my friend and i were disputing an answer.

the question was about a x mL of NH3 of .100 M being titrated with x mL of .100 M HCl

It said:

a- if you had an unknown amt. of water to the HCl, will the resulting pH be too high or too low and why?

I said you would be diluting the HCl so the pH would be higher than it normally would be. My friend said adding water results in more production of H+ which would make the pH lower. Who is right? Or neither?

Then the second part was adding water to the NH3 and the same concept, but I thought the change would be negigible since it is a weak base. My friend has the same logic as before but thought higher and I thought lower.

The last part was using phenophthalein as an indicator and we agreed here. We said that it would be higher since the range for this indicator is 8-9.6....but we may both be wrong??

2007-01-30 03:44:03 · 1 answers · asked by Anonymous

2007-01-30 03:40:05 · 3 answers · asked by Anonymous

2007-01-30 03:10:13 · 1 answers · asked by laurens_odyssey 1

I am not so sure

2007-01-30 02:47:14 · 1 answers · asked by Anonymous

Can't find a definition anywhere!Can anyone help?Thanks!

2007-01-30 02:17:18 · 1 answers · asked by starla_o0 4

2007-01-30 02:13:44 · 3 answers · asked by strange_bike 2

2007-01-30 01:48:47 · 11 answers · asked by Anonymous

2007-01-30 01:48:30 · 2 answers · asked by caucasiongirlnativeworld 1

2007-01-30 01:09:12 · 7 answers · asked by Pinky H 1

What are the differences (chemical and physical) between these two?

2007-01-30 00:22:50 · 3 answers · asked by PFX 3

are neutral atoms isotopes? and what are neutral atoms actually?

2007-01-30 00:20:20 · 4 answers · asked by Anonymous

2.29 mL of concentrated sulfuric acid (specific gravity 1.84) is added to mass of 0.1978 kg of water. The sulfuric acid solution is then titrated with NaOH and no. of mol of NaOH that reacted with H2SO4 is 0.0092 mol.

How do you calculate the molality of the acid produced by the dilution?

Can anyone pls help? Thanks a lot

2007-01-30 00:08:27 · 5 answers · asked by sky_blue 1

2007-01-30 00:01:41 · 1 answers · asked by xkkkimmm 1

I've seen kits offered on the internet, and I would supervise the lad so he knew what he was doing, but I mentioned the clock reaction to him when he was pondering a science project for this Spring. I don't think the chemicals used are dangerous enough to warrant more than eye protection and gloves, but is it too much for a 9 year old, or will his classmates be oohed and aahed? Thanks.

2007-01-29 23:56:21 · 2 answers · asked by Anonymous

this is exception;but reason what i think that in -i containing group there is partial shifting of electron cloud which create partial +ive on c but this cannot be happen in formic acid.

2007-01-29 23:47:21 · 2 answers · asked by dr.amit 1

2007-01-29 23:44:44 · 2 answers · asked by -jAiVe- 1