C4 REVISION COMPLETED

I hope you find this useful

Jasper :) 

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  • Created by: Irammm
  • Created on: 25-05-13 15:21
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  • C4 REVSION
    • Metals & Water
      • Metals have a high melting point due to their strong metallic bonding
      • Cu2+ ions react with sodium hydroxide to make blue solid in a precipitation reaction
      • Superconductors conduct electricity with little or no resistance
      • The thermal decomposition of transition metal carbonates results in the metal oxide & carbon oxide being made
      • Drinking water is purified by filtration, sedimentation  and chlorination
      • Copper compounds are often blue, iron(||) compounds are light green & iron(|||) compounds are often orange/brown
      • Sulfates in water can be tested using barium chloride, halides can be tested using silver nitrate
    • Atomic structure & atomic bonding
      • Ionic bonding happens because of the transfer of electrons from metals to non metals
      • The nucleus is made up protons & neutrons, it is surrounded by electrons
      • Isotopes are elements that have the same atomic number but different mass numbers
      • Electron=negetive charge, Protons= positive charge & neutrons= no charge
      • Sodium Chloride & Magnesium oxide form giant ionic lattices as their ions attract each other
      • Metals form positive ions as they loose electrons
      • 'Dot & Cross' models can be used to represent the ionic bonding  in compounds
      • Non metals form negative ions as they gain electrons
    • Groups
      • To identify the presence of lithium, sodium & potassium, flame tests can be used.
      • Group 1 metals have similar properties as they all need to loose one electron from their outer shell.
      • Chlorine= green gas. Bromine= brown liquid & Iodine= is a grey solid
      • Rubidium & Caesium are Group 1 metals which react violently  with water to give off hydrogen and make an alkaline solution
      • If a group 1 metal reacts with a group 7 non metal the word equation for the formation of a metal halide can be  constructed
      • The group number is the same as the number of electrons in the outside shell.
    • The Periodic Table & Covalent Bonding
      • Non metals combine by sharing electrons
      • The period to which an element belongs to is the same as the number of  occupied electron shells
      • Carbon Dioxide & water have low melting points as the intermolecular forces between them are weak
      • Carbon Dioxide & water are simple molecules with weak intermolecular forces between the molecules

Comments

Lorran payne

Thank you:)

rita

this is great thanks :)


Irammm

Thank you! :)

Let me know if there are any other revision notes you'd like me to create.

lisa linsdell

Mind map to help with the revision of OCR Unit 4. Use the test yourself facility to check understanding.

Romana101

JZK for the revision notes they really help

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