Chemistry (Science & Mathematics) - August 2006

boiling point of methane(CH4) : -164 degree celcius, relative molecular mass: 16
boiling point of neon(Ne) : -246 degree celcius. relative molecular mass: 20

2006-08-26 15:09:59 · 4 answers · asked by NCH 2

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does the following undergo physical or chemical change?

-dying of cloth
-ironing of pants
-healing of wound
-nail polishing
-ripening of fruit
-dissapearance of moth balls
-color processing in photography
-addition of carbon dioxide in sortdrinks
-extracting iron from ore
-smoking fish

2006-08-26 14:22:12 · 3 answers · asked by Anonymous

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How do you calculate a pure substance's purity based on it's boiling point?

2006-08-26 12:24:34 · 3 answers · asked by Anonymous

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stoichiometry?

how many atoms of hydrogen are in 10.586 grams of ammonia at STP?

is the answer 1.12 x 10^24?

2006-08-26 12:15:23 · 3 answers · asked by bookwurmgurl 2

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how many pounds does 4 gallons of gasoline amount to?

2006-08-26 12:12:42 · 6 answers · asked by Rebecca G 1

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what model effectively describes and explains the 3 phases of matter?what are its assumptions?

2006-08-26 11:33:51 · 3 answers · asked by kellahrocks 1

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why do we get angry?

2006-08-26 10:42:55 · 33 answers · asked by tariqsoni 1

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why do we get angry?

2006-08-26 10:32:13 · 9 answers · asked by tariqsoni 1

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Tris-Borate EDTA?

I have a question when making the .5 M EDTA solution to mix with the boric acid and tris base. My lab manual says to bring the pH up to 8.0 with sodium hydroxide to get it to dissolve, but after mixing the EDTA with some distilled water I checked the initial pH and it was already above 10! I tried this several times and got the same result. do you think the EDTA might be contaminated?

2006-08-26 10:30:39 · 4 answers · asked by Nalcon 1

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stoichiometry?

I'm having a problem remembering how to do this problem. can someone tell me the steps and i can actually do it? thanks!

How many moles of hydrogen are in 0.684 grams of sulfuric acid?

2006-08-26 09:43:09 · 6 answers · asked by bookwurmgurl 2

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What does alkyl means?

in organic chemistry,What does alkyl means?

2006-08-26 08:01:46 · 1 answers · asked by star123 2

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Why does black pepper separate in water when you add soap?

??????????? If you put black pepper in water and add liquid soap all of the ppper will seperate. Why does this occur? does it have something to do withcharged ions?

2006-08-26 07:57:24 · 4 answers · asked by neongreensugar 3

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Why CCl4 is a non-polar compound?

2006-08-26 07:56:09 · 8 answers · asked by star123 2

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polar and non-polar compound?

How can i easily identify which is polar and which is non-polar compound?

2006-08-26 07:32:36 · 4 answers · asked by star123 2

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Boiling points issues............?

Hey guys do you happen to know a couple of methods to correct boling points of organic compounds?? If so please explain them briefly....

2006-08-26 07:30:43 · 6 answers · asked by .,;*°CHANANAIS°*;,. 3

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What elements react to certin wavelengths?

Is there a book on it or web page. Example broad band sun light falling on a solar cell gets a electron but I do not want the reaction from the broadband light say I want the reaction from 1.6 micron, so what elements react at 1.6 micron or other defracted wave lengths to produce a electron to indicate the presence of the target.

2006-08-26 07:20:26 · 2 answers · asked by Anonymous

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In corrected ideal gas equation?

we take acual volumes occupied by the molecules but actual pressure exerted by the gas is less, then why dowe add some constant to make it ideal pressure, when this corrected equation is meant for real gases.

2006-08-26 07:13:38 · 4 answers · asked by Anonymous

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