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1. Collision frequency of reacting particles
   
2. Energy transferred during the collision

b) A catalysis, increased temperature, increased concentrationb

H₂SO₄ + 2NaOH --> 2H₂O + Na₂SO₄
2HCl + Mg(OH)₂ --> 2H₂O + MgCl₂

Using rows to represent mathematical operations and a column for each compound we can draw ourselves a table:

                             Ca       W      O
%                         13.9    ...

Calcuim is in group two which means when it forms an ion it will donate its two outer elections, this means a calcium ion will be smaller as it has one less shell of electrons.