C4
- Created by: 11APhillips
- Created on: 30-11-15 18:23
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- C4
- The Periodic Table
- Arranged into groups and periodsGROUPS = how many electrons in outer shell PERIODS = How many electron shells
- Atomic number = Number of protons which equals number of neutrons
- RAM = atomic mass. No of neutrons = Atomic mass-number of electrons
- Bonding
- Ionic
- Unstable atoms = too many or too little electrons in outer shell.
- Too little + too many = stable atom ionically bonding
- Metal - Non Metal
- mg2+ + 02- = mg+02
- Covalent
- Non Metal - Non Metal
- Atoms share outer shell
- Metallic
- An electrostatic force of attraction between metal ions and a sea of delocalised electrons.
- hard to break
- Superconducters = no electrical resistence.ADS = loss free power transmission./fast electrical circuits/powerful electromagnetsCONS = only at -269 degrees
- Ionic
- Group 1
- Alkali Metals react with water and oxygen
- More reactive as go down group, can react with group 7 halogens
- Flame test to test for alkali metals
- first, dip the wire in acid to sterilise. Then, use it to pick up element and put under flame.RED = LithiumOrange = SodiumLilac = Potassium
- Group 7
- Halogens
- React with the group 1 elements
- Bromine = Orange/Brown solid and used for pesticides.Chlorine = green gas and used for sterilisation. Flourine = gas used for toothpaste
- Transition elements
- Copper = BlueIron (II) = pale greenIron (III) = orange/brown
- Thermal decomposition always makes CO2.
- Water
- 1. Filtration - Large insoluble material is filtered off by sand or gravel.
- 2. Sedimentation - Chemicals are added to make large insoluble lumps, which are filtered off
- 3. Chlorination - Chlorine is added to kill microbes
- Water tests using silver nitrate and barium chloride.
- The Periodic Table
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