Chemistry C3

?
View mindmap
  • Chemistry C3
    • Relative Formula Mass
      • The Mr is the relative atomic masses of all the atoms in a compound
      • Percentage mass = Ar x number of atoms /Mr of compound
    • The Mole
      • 6.02 x 10p23
      • 1 mole of any given substance will have a mass equal to the Mr of that substance
        • E.g.               Ar of Carbon is 12, so 1 mole of carbon weighs 12g
      • No of moles = mass / Mr
    • Conservation of Mass
      • No atoms are destroyed or created during a reaction
        • This is why equations need to be balanced
      • If mass changes in a reaction:
        • If mass increases, it's likely that one of the reactants is a gas
        • If mass decreases, it's likely that one of the products is a gas.
    • Limiting reactants
      • Reactions stop when all of one reactant (the limiting reactant) has been used up.
        • All other reactants are in excess
  • Limiting reactants
    • Reactions stop when all of one reactant (the limiting reactant) has been used up.
      • All other reactants are in excess
  • Atom Economy
    • Atom economy = Mr of desired product / Mr of all reactants
    • A higher atom economy is better for profits and the environment
    • It is more beneficial to find a reaction that gives useful bi-products rather than ones which will be wasted.
  • Percentage Yield
    • percentage = mass of product made / maximum theoretical mass of product
    • Always less than 100%

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Calculations, moles and yield resources »