diamond and silicon dioxide Flashcards
1
Q
what state are giant covalent molecules at room temp?
A
solids
2
Q
why are giant covalent molecules solids at room temp?
A
because they have millions of strong covalent bonds, so they have high melting and boiling points
3
Q
what is diamond formed from?
A
carbon
4
Q
what happens to the carbon atoms in a diamond?
A
each forms 4 covalent bonds to 4 other carbon atoms
5
Q
what do diamonds have?
A
a huge number of covalent bonds (these have to be broken when diamond is melted, requires a great deal of energy)
6
Q
what can diamond not conduct?
A
electricity, because there is no free electrons to carry electrical charge
7
Q
what is silicon dioxide also known as?
A
- silica
- sand
8
Q
what elements does silicon dioxide contain?
A
- silicon
- oxygen
