Pages in this set

Page 1

Preview of page 1
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…

Page 2

Preview of page 2
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…

Page 3

Preview of page 3
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…

Page 4

Preview of page 4
Group 7 - Halogens
15 December 2011
12:12


Electronegativity decreases down the group
The Atomic Radius, melting point, boiling point increase down the group.




Chemistry RG Page 4

Page 5

Preview of page 5
Metallic Bonding
15 December 2011
18:44


Metallic lattice
Close packed metal ions
High melting and boiling points




Chemistry RG Page 5

Page 6

Preview of page 6
Ionic Bonding
15 December 2011
12:13


Lose outer electrons

Electrostatic Lattice




Chemistry RG Page 6

Page 7

Preview of page 7
Covalent Bonding
15 December 2011
18:46


Sharing of electrons between non metals
Forms Neutrally charged molecules.




Chemistry RG Page 7

Page 8

Preview of page 8
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…

Page 9

Preview of page 9
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…

Page 10

Preview of page 10
Next Page >




Chemistry RG Page 10

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.

Similar Chemistry resources:

See all Chemistry resources »See all resources »