OCR Chemistry F321 Exam. - [Next Tuesday[

Aluminium:
Giant Metallic Lattice
Held together by strong metallic bonds. Metallic bonding is the electrostatic force of attraction between positive metal ions and sea of delocalised electrons.
High boiling point due to the strong metallic bonds which require high amounts of energy needed to break them.
Silicon:
Giant Covalent Lattice
Held together by strong covalent bonds.
High boiling point due to the strong covalent bonds which require very high energies to break these strong bonds.
Phosphorus:
Simple molecular OR simple covalent molecule
Held together by WEAK VDW forces
Therefore less energy required to overcome these weak forces.

I think these will be the marking points

yes definitely, no harm in writing extra though. and it did state in the question to compare the trend across the period didnt it? You should be able to get all 6 marks even if you don't put a comparison anyway

yeah thats right =]

Hey dude what did you get for that second to last question regarding the identity of the group 2 metal

16 17 16
16 18 14

I think.

yeah thats right =]

yeah thats right =]

it was 16 18 18 - as had a charge of -2!!

Sorry mate, it was H2S03

H2SO3 +SR = SRS03 + h2
owned.

magnesium?

Protons - Neutrons - Electrons
16 - 17 - 16
16 - 18 - 14

I think.

**** I got berilium

Protons - Neutrons - Electrons
16 - 17 - 16
16 - 18 - 14

I think.

Protons - Neutrons - Electrons
16 - 17 - 16
16 - 18 - 14

I think.

No H20 is formed, not H2.

WOOPSIE sorry yeah u add 2 electrons =]! did write it correctly, just read that quick and didnt check =]

I couldve sworn it was a 2- ion so there would be 18 electrons?

No H20 is formed, not H2.