chemistry 1.5 / 5 based on 2 ratings ? ChemistryGCSEEdexcel Created by: hollie stevensonCreated on: 28-02-13 13:46 what is the collision theory? the rate of the reaction depends on how often/how hard collisions take place. 1 of 6 what is a catalyst? a catyalyst is a substance witch speeds up a reaction without it being used up. 2 of 6 what is a exothermic reation? overall gives out energy to form heat. 3 of 6 what is endothermic? takes in energy, shown by a fall in the temperature. 4 of 6 what is special about group 0/8? have many everyday uses,e.g placed in helium. 5 of 6 halogens+metals=? metal haildes 6 of 6
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