Help with Science paper

[Guantanamo]

I'm going over some old science papers as revision and a few questions have me stumped so I was wondering if the forumites could help.

1. What type of bond does Aluminium form a) when it bonds with itself b) when it bonds with a non-metal?

then based off that question it asks for the lewis diagram of the formation of Aluminium oxide, Would you use ionic or covalent bonds to do this?

2. What type of solid is formed when Silicon bonds with itself?
3. What type of bonding occurs between Silicon atoms?
4. Vibrations in the earths crust deep beneath the sea caused the Asian tsunami. The frequency of the vibrations was 60s^-1, the amplitude of the the waves generated was 10m and the speed of the waves was 300m.s^-1.
When these waves hit off the coast of Thailand they had an amplitude of 60m. Explain how this was possible.(My answer was more in terms of what happens in geography as it is one of my other subjects but I then said that friction caused the speed of the waves to slow down but the frequency and period remained the same, therefore the amplitude increased and the wavelength decreased. In the memo it simply says complete constructive superposition.)

Thanks

 

[wayfarer]

1. What type of bond does Aluminium form a) when it bonds with itself b) when it bonds with a non-metal?

Aluminium is a metal. All metals form metallic bonds when bonding with other metals (and with itself, also a metal), and ionic bonds when bonding with non-metals. Metals never bond covalently, regardless of the other elements they bond with.

...then based off that question it asks for the lewis diagram of the formation of Aluminium oxide, Would you use ionic or covalent bonds to do this?

Answered above.

2. What type of solid is formed when Silicon bonds with itself?

You're likely looking for crystalline solid.

3. What type of bonding occurs between Silicon atoms?

Silicon is a semi-metal or metalloid, but bonds like a non-metal. Hence it forms covalent bonds with itself.

 

[Guantanamo]

Thanks so much, I thought aluminium was a semi-metal. Thats pretty much answers everything.

 

[UnUnOctium]

4) The depth of the sea decreases gradually to shore level (that's one of the reasons). Constructive interference (or referred to as supeposition in your paper) happens sidue to the fact that the first waves are indeed slowed by friction and therefore consequent ones match up in phase (and act as a pushing force as well) to the ones in front. If your period remains the same your wavelength also remains the same (speed of wave in medium [constant] = wavelength * (1/period)).

 

[Palimino]

I'm going over some old science papers as revision and a few questions have me stumped so I was wondering if the forumites could help.

Head explodes. Brain shrapnel obscures monitor screen.