Chemistry - December 2007

question about echinoderms? - from Kate M - 1 answer(s)
Echinoderms: What are they interactions with other organisms, and with humans? - from YOU! - 1 answer(s)
Echinoderms: What are they interactions with other organisms, and with humans? - from YOU! - 1 answer(s)
Are echinoderms endothermic or exothermic? - from erikgh1990 - 1 answer(s)
what are echinoderms? - from jada t - 4 answer(s)
M

2007-12-13 07:07:03 · 1 answers · asked by Anonymous

Thanks.

2007-12-13 07:04:01 · 2 answers · asked by chemquestions1 1

Or is the size irrelevant, and the amount of gas produced is a direct result of the amount of energy used...

2007-12-13 06:55:23 · 3 answers · asked by Anonymous

2007-12-13 06:17:48 · 3 answers · asked by The Gangsta! 2

2007-12-13 06:09:03 · 3 answers · asked by Daniel P 2

a) A free radical is a molecule with one or more unpaired electrons

b) Molecules in the atmosphere can gain energy equal to hλ by absorbing a photon.

c) Chemical reactions that do not occur at normal atmospheric temperatures can take place by absorbing a photon

d) O2(g) → O + O is an example of photodissociation

2007-12-13 05:45:06 · 2 answers · asked by ginger_spic 1

2007-12-13 05:39:29 · 3 answers · asked by Sadaf N 1

I get most of the concepts but how come for electronegativity going up then down decreses the Electronegativity and going left to right increases it?

2007-12-13 04:51:50 · 2 answers · asked by Micky D 3

six? eight? two? i dont know

2007-12-13 04:48:03 · 2 answers · asked by Rachel B 1

I am looking to try and constuct some plastic objects that I have in molds. I need the polmer mix to be able to be liquid when heated or alone and then add something or heat to make it a hard, malleable and not brittle plastic. Also fairly light.

Would Polyurathane work?

2007-12-13 04:30:40 · 1 answers · asked by Anonymous

I need to make someone's lips foam for a film, what everyday items can I use to do this...eg. vinegar and baking soda but something that tastes nice

2007-12-13 04:07:13 · 5 answers · asked by jeff lemon 1

So what is the possible effect in our lives or in our environment?

2007-12-13 03:26:53 · 3 answers · asked by Jeff 1

2007-12-13 03:25:28 · 2 answers · asked by Chris G 1

3) Positive hydrogen atoms react with nearby negative hydrogen atoms

Which of the following is the correct formula for the element when in its natural state?
1) H
2) H2
3) Mg2

Water is a polar molecule because:
1) the one Oxygen has more pull on the electrons than the Hydrogens.
2) the single Oxgen atom is larger than the two Hydrogen atoms combined.
3) the one Oxygen has less pull on the electrons than the Hydrogens

Multiple bonds form because each atom in a molecule needs more than one electron to form an octet.
1) True
2) False

Which of the following is the correct formula for the element when in its natural state?
1) Na2
2) Na
3) Br

2007-12-13 03:22:16 · 5 answers · asked by sammy 1

What is scale model?
i have to do project in my chemistry class about a birthstone
and the teacher said dont make a poster but scale model. and it had to be a 3-d model of my birthstone???

what does that mean ??? scale model and how it looks like?

2007-12-13 03:16:38 · 6 answers · asked by beauty mirna 3

a) spontaneous
b) incomplete
c) exothermic
d) endothermic

2007-12-13 03:00:32 · 6 answers · asked by Anonymous

Why does the temprature remain unchange at the melting point when a solid melt into liquid?

2007-12-13 03:00:24 · 4 answers · asked by Y T 1

A)Ca
B)S
C)O
and show how you got it.

2007-12-13 02:44:31 · 2 answers · asked by poisidan 1

A) a piece of zinc is dropped into a solution of silver nitrate.
B)Sulfuric acid solution is reacted with sodium hydroxide solution.

2007-12-13 02:43:22 · 3 answers · asked by poisidan 1

(spt heat water=1.00cal/gc(the formula used if its Q m delta t

2007-12-13 02:41:25 · 2 answers · asked by poisidan 1

What is the advantages of using Ringer solution for the preperation of dilutions as opposed to water or a growth medium?

2007-12-13 02:30:43 · 3 answers · asked by Anonymous

2007-12-12 19:54:55 · 6 answers · asked by anna clarissa 1

2007-12-12 19:36:22 · 9 answers · asked by roel c 1

I have done a Cap GC analysis of Xylene mix.

I have the Chromatogram and the chromatogram report which shows the retantion time peak area and area%.

how can I calculate the relative peak area from the above information?

is the relative peak area meance the area on the chromatogram report?

2007-12-12 18:06:31 · 3 answers · asked by LG 1

write the electron configuration and orbital diagrams of the folowing elemnts and detemine the electron valences!!

1. o:z=8

2. n:z=7

3. ar.z=18

4.v.z=23

thnaks person if correct or most correct will get 10 pionts promise

2007-12-12 17:07:21 · 1 answers · asked by lola 1

explain the emission of light by hydrogen atom and all other atoms



10 points for 1st correct answer

2007-12-12 17:03:53 · 1 answers · asked by lola 1

HF(g) + BF3 (g) ---> ????????????

is it no reaction

2007-12-12 16:50:18 · 2 answers · asked by poo 2

Ca= 21.05%
S=16.84%
O= 58.95%
H= 3.16%
H20= 28.42%

2007-12-12 16:33:00 · 1 answers · asked by Anonymous

what is the empirical formula of a molecule containig
65.5% carbon
5.5% hydrogen
29.0%oxygen

2007-12-12 16:25:35 · 2 answers · asked by Babyblue_gurl3 1

the teacher prepared the cation solutions using compounds that contain the nitrat ion. For example, the solution marked Ca(+2) was prepared by dissolving Ca(No3)2 in water.

2007-12-12 16:17:03 · 2 answers · asked by helloo 1