Chemistry C1 AQA GCSE part 2
- Created by: pixar
- Created on: 20-06-14 10:24
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- Chemistry C1 GCSE AQA Triple Award Part 2
- electron shells
- rules
- the closest shells get filled 1st
- only certain amounts of electrons are allowed on each shell
- 4th shell - 16
- 3rd shell - 8
- 1st shell - 2
- water H2O
- insert electron shells diagram here
- 2nd shell - 8
- atoms without a full outer shell are reactive because they need more electrons
- atoms that have a full outer shell are not reactive
- electrons always occupy shells
- diagram
- stick electron shell diagram here
- rules
- compounds
- atoms join together to make compounds
- when different elements react, atoms form chemical bonds
- its usually difficult to seperate the two original elements again
- making bonds involves atoms taking, giving or sharing electrons
- the nucleus isn't involved
- a compound made from a metal and non - metal consists of ions
- the metal atoms lose electrons to form positive ions
- the opposite charges mean that they are attracted to each other which is called ionic bonding
- stick ionic bond diagram here
- the opposite charges mean that they are attracted to each other which is called ionic bonding
- the non - metal atoms gain electrons to form negative ions
- the opposite charges mean that they are attracted to each other which is called ionic bonding
- stick ionic bond diagram here
- the opposite charges mean that they are attracted to each other which is called ionic bonding
- the metal atoms lose electrons to form positive ions
- a compound made from non - metals consist of molecules
- each atom shares an electron
- this is called covalent bonding
- stick covalent bond picture here
- this is called covalent bonding
- each atom shares an electron
- when different elements react, atoms form chemical bonds
- atoms join together to make compounds
- balancing equations
- atoms aren't lost or made in chemical equations
- during a chemical reaction things don't just appear or dissapear
- because of this the mass of the reactants equal the mass of the product
- you still have the same atoms at the end as there are at the start
- balanced symbol equations show the atoms at the start and at the end and show how they are arranged
- during a chemical reaction things don't just appear or dissapear
- balancing the equation
- there must be the same number of atoms at both sides
- you balance the equation by putting numbers infront of the formulas when needed
- diagram stick here
- atoms aren't lost or made in chemical equations
- electron shells
- making bonds involves atoms taking, giving or sharing electrons
- the nucleus isn't involved
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