Chemistry - July 2007

Thale seeing that moist is contained in all things their he begin affirming that the moist comes from water.

2007-07-18 19:50:12 · 1 answers · asked by jam 1

2007-07-18 18:17:22 · 18 answers · asked by breezy 2

Blood is diluted to 200x its initial vol. and microscopically examined in a layer 0.10mm thick, an average of 30 rbc's are found in each 100 X 100 um square. a)How many red cells are in a cubic mm of blood? b) The rbc's have and average life of 1 month, and the adult blood volume is about 5L. How many rbc's are generated every second in the bone marrow of the adult?

2007-07-18 17:46:54 · 2 answers · asked by Tastytaint 1

What is a element?

I'm having trouble understanding exactally what a element is and how atoms play a roll in them. Can someone please explain this in a down to earth way? Thanks.

Please don't use a analogy too... Thanks.

2007-07-18 16:59:50 · 6 answers · asked by Anonymous

wondering if i should go to work tomorrow.

2007-07-18 16:01:44 · 3 answers · asked by Anonymous

2007-07-18 15:39:22 · 3 answers · asked by kaiser_willi 1

When a platinum wire is heated in a bunsen burner flame, the platinum gets red hot, but returns to its original appearance on cooling. Has the platinum wire undergone physical change, chemical change, or both when heated?

2007-07-18 15:35:13 · 6 answers · asked by Anonymous

1. NaOH + KClO3 -->
2. NaOH + NaBr -->
3. NaOH + NH4Cl -->
4. NaOH + Na2SO4 -->
5. NaOH + KIO3 -->
6. NaOH + Na2S -->

Help Please!

2007-07-18 14:58:57 · 2 answers · asked by cbrice9 1

Because since air is made up of basically nitrogen and oxygen chemically combined, and water is made up of hydrogen and oxygen, why isn't a molecule of air heavier because hydrogen weighs a lot less and the total atomic mass of the elements of each one put together would mean air weighs more. I do not understand why it weighs less. Please help.

2007-07-18 14:52:56 · 5 answers · asked by TaCaBu 2

They take any hidrocabons,like plastic and use microwaves to turn it back in to oil to make gasoline.

2007-07-18 14:27:52 · 6 answers · asked by scott p 5

2007-07-18 12:53:08 · 2 answers · asked by Doraemon 1

2007-07-18 12:51:34 · 1 answers · asked by Doraemon 1

can you use morton salt?sugar?coloring? how do you make it? how long does it take?

2007-07-18 11:25:55 · 4 answers · asked by Anonymous

empirical is the simplest and molecular is the normal formula

2007-07-18 11:14:54 · 2 answers · asked by chemhelp 1

2007-07-18 10:54:04 · 14 answers · asked by alexander w 1

What mass of nitrogen gas must be released into an 18 L automobile air bag if the pressure in the bag is to be 2.0 atm at a temperature of 20°C?

2007-07-18 10:30:26 · 2 answers · asked by justjrry 3

2007-07-18 10:29:37 · 3 answers · asked by justjrry 3

Mg(OH)2 (s) = Mg^2 (aq) + 2 OH^- (aq)

Is this reaction endothermic or exothermic and why

2007-07-18 10:26:02 · 0 answers · asked by D 1

And how do you Identify oxidizing and reducting agents in chemical reactions.

2007-07-18 08:05:06 · 3 answers · asked by Anonymous

2007-07-18 07:41:41 · 3 answers · asked by Anonymous

2007-07-18 07:28:41 · 4 answers · asked by 3rre 1

purification of LDH was done from beef heart extract. my result were consistent with my classmates from the salting out part till the dialysis. but after i get my fractions from chromatography my LDH yield was much lesser than expected. wat could be the reason causing this? i need every possible reason to troubleshoot. thanks for helping.

2007-07-18 07:21:42 · 2 answers · asked by crystal 1

Half Life?

2007-07-18 06:42:37 · 5 answers · asked by dr strangelove 6

Calculate the critical density of methyl alcohol from the following data:
ρ -------- d liq. (g/cc) ------ d vap. (g/cc)
13.57 ------ 0.6495 ----------- 0.01562
61.25 ------ 0.4675 ----------- 0.1003
The critical temperature is 240 C.

2007-07-18 06:09:09 · 3 answers · asked by g2hn 3

For Biology I was asked to list 10 different bonding combinations including carbon. I'm supposed to list the bonding combinations name and chemical formula as well. I don't need you to come up with all 10 of the combinations or tell me the name and chemical formula if you don't feel like it, I just need some ideas. H2O was given as an example so I'm not allowed to use that combination. Thanks!

2007-07-18 05:55:05 · 4 answers · asked by Anonymous

The question:
What is the molarity of a solution when 9.65 g of CuCl2 is dissolved in 2525 mL of solution?

My answer:
0.15 mols CuCl2 / 2.525 L
I think I'm right, but I can't afford to be wrong.

2007-07-18 05:52:15 · 7 answers · asked by Anonymous

2007-07-18 05:43:09 · 16 answers · asked by Anonymous

Ba3(PO4)2

2007-07-18 05:42:39 · 5 answers · asked by fabulous101 2

I wanted to know, what topics could I review form General Chemistry that would have me better prepared?? Also, are there some places online that could help me with the class??? Thanx

2007-07-18 05:34:48 · 9 answers · asked by Anonymous

2007-07-18 05:30:19 · 5 answers · asked by Great_Magician13 2