Science & Mathematics - 22 June 2006

SiO2 have lower b.p. and m.p. (2980,1610) than the MgO (3600,2852) and Al2O3 (2980,2027). Why?
since sio2 is in macromolecular lattice structure, it should have higher lattice energy than the ionic compound...
my lecturer explain to me that the sio2 is amorphous solid...
is it correct?

and another qusetion
can an insulator conduct electricity under high current or high voltage?

2006-06-22 04:52:20 · 4 answers · asked by Anonymous in Chemistry

I need to know how to convert all logs of an eq into a commont log. My calculator only does common logs so I need to know how to convert all others into the common log.

2006-06-22 04:51:57 · 8 answers · asked by Anonymous in Mathematics

2006-06-22 04:51:53 · 18 answers · asked by BLUE TECH 1 in Astronomy & Space

Then Density of 68% HNO3 is 1.41 g/ml. (I'm missing something!! Thanks!!

2006-06-22 04:51:13 · 1 answers · asked by merlin 1 in Chemistry

I always ponder over this question, might be a person who is good with chemistry can answer this well.

Which is the most inflamable gas?
Ans: Hydrogen (H)

Which is the best combustion supporter?
Ans: Oxygen

Chemical formula of Water is H2O, ie. Water is made up of Hydrogen and Oxygen. But still Water is used as a fire extinguiser and does not get ignited. Can some one clear me with this question?

2006-06-22 04:47:42 · 15 answers · asked by koolbvr 2 in Chemistry

2006-06-22 04:47:00 · 12 answers · asked by midget the bridget 1 in Astronomy & Space

2006-06-22 04:45:43 · 12 answers · asked by BLUE TECH 1 in Astronomy & Space

earth rotating and revoluting but we cant feel weather it is rotating or not. though we r getting day n night why cant we feel like in a gaint wheel or else in some other thing.

2006-06-22 04:41:42 · 11 answers · asked by naidu 1 in Earth Sciences & Geology

2006-06-22 04:41:04 · 12 answers · asked by saltkid1 2 in Zoology

2006-06-22 04:40:37 · 11 answers · asked by dfjhdjkhk l 1 in Zoology

2006-06-22 04:40:22 · 12 answers · asked by bringenkaos 2 in Biology

2006-06-22 04:36:06 · 13 answers · asked by Henry B 2 in Physics

trigonometry

2006-06-22 04:30:57 · 10 answers · asked by fun2sh 2 in Mathematics

2006-06-22 04:29:39 · 10 answers · asked by Mircea 2 in Zoology

In reference to primary, secondary, tertiary, quaternary or linear structures of RNA.

2006-06-22 04:26:32 · 3 answers · asked by Laura B 1 in Biology

2006-06-22 04:24:30 · 1 answers · asked by simdi 1 in Earth Sciences & Geology

im trying to work out the % crystallinity using differential scanning calorimetry. so i need the standard heat of HDPE.

2006-06-22 04:22:59 · 3 answers · asked by tony 1 in Chemistry

2006-06-22 04:19:41 · 2 answers · asked by fun2sh 2 in Mathematics

pls!!! can you answer

2006-06-22 04:18:56 · 22 answers · asked by marcylina m 1 in Mathematics

The LAW OF THERMAL DYNAMICS disproves it. "Matter cannot be created nor destroyed." It is a LAW OF SCIENCE. SCIENCE DISPROVES THE BIG BANG!!!

2006-06-22 04:15:54 · 23 answers · asked by Skidude 3 in Astronomy & Space

Ok, Toast always lands buttered side up. And cats always land on thier feet, so what happens if you attach toast to a cat?

2006-06-22 04:15:24 · 14 answers · asked by Spudguy 2 in Physics

It does not matter the size of a piece of paper - you can use a bed-sheet or a tarp or an A4 or letter sized piece of paper. Regardless, it cannot be folded in *half* more than eight times.

2006-06-22 04:14:38 · 7 answers · asked by Justin S 1 in Mathematics

2006-06-22 04:07:30 · 8 answers · asked by win16 1 in Physics

3 man went to a motel. the man behind the desk said the room was $30,so each man gave $10 and went to room.later he realized the room was $25,so he sent the bellhop back to the guys with $5. on the way the bellhop couldnt figure how to split $5between 3 guys so he gave each of them $1and kept the other $2. that left the three guys paying $9 each for the room. 3x9=27 +the 2 that the bellhop kept =29. WHERE IS THE OTHER DOLLAR?????????????

2006-06-22 04:02:07 · 5 answers · asked by Anonymous in Mathematics

2006-06-22 03:57:45 · 4 answers · asked by ivar 1 in Chemistry

what is the best way to undertand stoichiometry?on what branch of chemistry should we be good at to start stoichiometric solving ?

2006-06-22 03:53:43 · 5 answers · asked by Anonymous in Chemistry

2006-06-22 03:51:47 · 7 answers · asked by Anonymous in Engineering

2006-06-22 03:50:52 · 6 answers · asked by STEPHEN W 1 in Biology

This question was previously asked, and Powell River, BC was the deemed the safest according to the following research: http://www.kubby.com/GlobalStorming/safeplaces.html

2006-06-22 03:45:36 · 8 answers · asked by sarahsunshinecoast 4 in Geography

in a simple supported beam. solid rectangle beam and i beam.

2006-06-22 03:43:39 · 3 answers · asked by clementchong_86 1 in Engineering