Chemistry - September 2006

hello,

In the past, I have seen people use dry ice for fog effects on stage. I have seen massive amounts of fog produced, so much so that a large room was covered in fog, up to about 4 feet off the ground. I've read that large amounts of fog can be produced. However, yesterday I placed a 20 pound block of ice in a bucket of hot water, and the effect was disappointing. The fog flowed over the bucket, and disapated within a radius of roughly 3 or 4 feet from the pail. Any ideas why it didn't work, or how I can fix it?

Several sites warn you not to use too much fog, since you can fog up the whole front of the audience. I am looking for an effect similar to this in magnitude...any help is appreciated :-).

2006-09-29 13:59:02 · 7 answers · asked by Michael T 2

Which of the following is most affected by "Acid Rain" ???
Briefly Explain

Cu, Fe or Al

2006-09-29 13:50:38 · 4 answers · asked by Anonymous

according to conservation of mass, what will happen to the mass when Lead nitrate is mixed with sodium iodide???????

2006-09-29 13:43:59 · 3 answers · asked by Anonymous

2006-09-29 13:16:23 · 9 answers · asked by rethinker 5

2006-09-29 13:14:26 · 3 answers · asked by Anonymous

2006-09-29 12:57:42 · 2 answers · asked by hey 1

Ozone, O3, is a very reactive form of oxygen. It's structural formula = O - O. The structure of normal atmospheric oxygen is O = O. When ozone reacts it releases a free oxygen. Using knowledge of chemistry why is the ozone so reactive?

2006-09-29 12:55:28 · 2 answers · asked by Nurse2b 1

the toxicity of chemicals in the dust of 9/11 was equivalent to.....

2006-09-29 10:31:55 · 3 answers · asked by ameeeeeeeeeeeeeeeet 2

what chemical found in dust september 11

2006-09-29 10:28:04 · 2 answers · asked by ameeeeeeeeeeeeeeeet 2

The direction of change in a reaction depends on the combined changes of entropy, heat of reaction, and temperature. If this is expressed as ∆G=∆H - T∆S, what would it mean if the value for free energy (∆G) is zero

A.The reaction is spontaneous
B.The reaction is in equilibrium
C.The reaction isn’t spontaneous
D.No reaction is possible

2006-09-29 09:31:13 · 8 answers · asked by scienctist 1

The Biology Department is considering purchasing new microscopes from Schultz Optics. The diameter of the field of view using the high power (40x) objective is 0.35 millimeters (mm). If you were to use this microscope, and under high power found that the longest dimension of a particular cell fills 1/10 of the diameter of the field, what is the size of the cell in reality? Provide your answer in micrometers (um), rounded to the nearest whole number. Do not include units in your answer.

2006-09-29 09:07:21 · 5 answers · asked by Anonymous

2006-09-29 08:41:12 · 2 answers · asked by john w 1

in a chemical equation, how do i know what symbol to put after an element? like (aq), (l), (s), etc? is there a certain way? coz i'm so confused

2006-09-29 08:22:27 · 6 answers · asked by blue_bee 4

2006-09-29 08:17:49 · 7 answers · asked by Anonymous

Science homework year 5

2006-09-29 08:09:21 · 7 answers · asked by kimmy 1

My book explains: In redox reactions, the key chemical event is the net movement of electrons from one reactant ot the other.

What I am thinking is duh! Aren’t all reactions like this? What makes redox reactions different from any other reaction? Am I missing something here?

If there is a difference, can you give me an example to clarify this?

2006-09-29 08:05:11 · 7 answers · asked by Anonymous

what colors they change when in contact.

2006-09-29 07:16:05 · 2 answers · asked by Josh 2

2. In the photographic process, silver bromide is dissolved by adding sodium thiosulfate.

AgBr(s) + 2Na2S2O3(aq) --> Na3Ag(S2O3)2(aq) + NaBr(aq)

If you want to dissolve 0.250 g of AgBr (molar mass = 187.8 g/mol), how many milliliters of 0.0138 M Na2S2O3 should you add?

2006-09-29 06:58:36 · 3 answers · asked by Anonymous

2006-09-29 06:54:44 · 3 answers · asked by menchi 1

Im Doin A Science Project and all and i Really Need Sume Answers or if you know a good Site that i could go on that is school orented lol i don't know how to spell that
thank you

2006-09-29 06:44:25 · 3 answers · asked by Nanabooboo 1

2006-09-29 06:29:33 · 9 answers · asked by boaz0612 2

2006-09-29 06:27:46 · 4 answers · asked by amir m 1

2006-09-29 06:23:41 · 3 answers · asked by dora v 1

2006-09-29 06:17:05 · 3 answers · asked by Jordan T 1

Or is it a chemical thing. Do I keep using the compound , buff shine compound buff shine until no more black or will it always be black.

2006-09-29 06:10:20 · 1 answers · asked by sweet pea 3

if a vinyl floor was installed in the 1970's, would this flooring have any asbestos in it.

2006-09-29 06:06:13 · 3 answers · asked by jim c 1

The Diameter of Chromium(Cr) atom is about 2.4 A( w/ accent above A)...

(A) Express this distance in nanometers..my answer .240

Express this distance in picometers.. my answer 240

(B) How many chromium atoms would have to be lined up to span 1.00 cm. My answer 4.17E-13..or 4.178 x 10 ^-13

Please let me know if they are right or wrong, if wrong, how can I fix them! Thanks!

2006-09-29 05:57:05 · 6 answers · asked by lsubetty 2

2006-09-29 05:56:13 · 1 answers · asked by Anonymous

2006-09-29 05:32:07 · 2 answers · asked by carleyyxox 1

2006-09-29 05:24:36 · 3 answers · asked by Che che 1