Model Answers for F332

Model answers for some of the common questions.

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  • Created by: Iqra Bibi
  • Created on: 08-05-12 12:28

Hydrogen Bonding

How it occurs:

Lone pair of electrons on oxygen in one molecule is attracted to H with δ+

charge in the other molecule (2 marks)

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Instantaneous dipole - induced dipole

How it arises:

electron movement in molecules creates an uneven distribution of charge leading to temporary dipole

A dipole is induced in neighbouring molecules leading to attraction (2 marks)

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Differences between Silicon Oxide and Carbon Dioxi

Sio2= giant covalent structure, or whole structure held together by covalent bonds

CO2= simple molecular

comparison= weak intermolecular bonds or forces in CO2 so less energy is needed to separate molecules bonds in SiO2 are stronger than CO2 intermolecular bonds (or forces)

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Effect of temperature on the rate of reaction

Rate is higher when the temperature is higher

Particles have more energy so they move around faster

there are more frequent collisions

More particles have the total energy of at least the activation energy

(5 marks)

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Comments

Tom

Good stuff. Could you add to it with stuff about CFCs, UV Rays, etc?

Lorna Mashongamhende

Really helpful can you do some stuff on initiation, propogation and termination

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