Title based Notes on AQA C1 AS

Some comprehensive title based notes based on my own difficulties. There are many!

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  • Created by: Alex A
  • Created on: 13-01-12 11:37
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Revision X'mas 2011
15 December 2011
12:10
Topics:
Definition of Isotopes
Mass Spectrometry
Shapes of Molecules
Group 7 - Halogens
Co -ordinate Bonding (Dative)
Metallic Bonding
Ionic Bonding
Covalent Bondingaqa
First Ionisation Energy
Isomerism
Naming Molecules
Relative atomic mass
Percentage atom economy
Empirical formula
Thermal Cracking
Global Dimming
Crystals
Van der Waal's Forces
Hydrogen Bonding
Chemistry RG Page 1

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Definition of Isotopes
15 December 2011
12:11
Isotope: atoms of the same element with the same atomic number but a different atomic mass.
Isotope: Atoms with the same number of protons in its nucleus and different number of neutrons
Atomic Number: Proton Number i.e. the number of Protons in a nucleus.…read more

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Mass Spectrometry
15 December 2011
12:11
Gives us an accurate value for the relative atomic mass.
What happens?
Atoms are made into ions by firing electrons at them, this knocks out electrons forming positive ions.
The process has to take place under a vacuum.
The sample must be gaseous
The +'ve ions accelerate due to the -'ve metal accelerates attracting them.…read more

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Group 7 - Halogens
15 December 2011
12:12
Electronegativity decreases down the group
The Atomic Radius, melting point, boiling point increase down the group.…read more

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Metallic Bonding
15 December 2011
18:44
Metallic lattice
Close packed metal ions
High melting and boiling points
Chemistry RG Page 5…read more

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Ionic Bonding
15 December 2011
12:13
Lose outer electrons
Electrostatic Lattice
Chemistry RG Page 6…read more

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Covalent Bonding
15 December 2011
18:46
Sharing of electrons between non metals
Forms Neutrally charged molecules.…read more

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First Ionisation Energy
15 December 2011
12:13
The energy required to remove one mole of electrons from the molecule, when in gas state
The energy required to remove one mole of electrons from one mole of atoms, when in gas state
X(g) X(g)+ + e -
Due to repulsion of paired electrons it is easier to remove paired electrons.
Ionisation energy generally decreases down the groups and increases across the periods.
Pasted from:
Topic 1.…read more

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Shapes of Molecules
15 December 2011
12:12
Easy Guide:
1. Count electron pairs:
Count Number of electrons in base element:
C= 4
N=5
O= 6
F= 7
Then add the number of elements bonded to it:
CCl 2F2 = 4
4+4=8
Then divide by 2
8/2=4 pairs therefore 4 lines on diagram and a tetrahedral.
If you don't have enough elements to use up your electrons
then you have lone pairs.…read more

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Chemistry RG Page 10…read more

Comments

aleena

Concise notes on the Topic 1 but could do with some more examples e.g shapes of molecules, give a definition of relative atomic mass rather than an equation.

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