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 Science & Mathematics ➔ Chemistry
MgO and Al2O3 have greater ionic character than SiO2. A compound melts when the lattice breaks down and a lattice breaks down when the bonds holding it in place give way.
Ionic bonds are stronger than Covalent ones.
There are some amorphous forms of SiO2.
Yes, an insulator can conduct under such conditions.
2006-06-22 04:58:11 · answer #1 · answered by ag_iitkgp 7 · 0⤊ 0⤋
Sorry, I can't answer the first question. But I can answer the 2nd question. The answer to the second question is: No, because insulating material holds it's electrons. But material that doesn't hold it's electrons, can trade\transfer electrons from atom to atom, so that's how (ex. metal) can conduct electricity. Electricity is electron flow. ELECTricity ELECTron.
2006-06-22 11:11:45 · answer #2 · answered by www.FreeDebtConsultation.ubb.cc 3 · 0⤊ 0⤋
come on , It depends on your base.If you were good in the previous course in organic chemistry, you should do well the second semester . However, it needs a lot of time for studying . And the most important thing is that you must study daily.
2016-05-20 11:21:46 · answer #3 · answered by Anonymous · 0⤊ 0⤋
If there is a greater electronegativity difference between two elements, there's usually a higher melting/boiling point.
2006-06-22 06:41:43 · answer #4 · answered by b 3 · 0⤊ 0⤋