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A chemical reaction can only occur when molecules collide.
The chart below compares a car accident to the particle theory collision model.
http:// www.yteach.co.uk/page.php/resources/view_all?id =collision_theory_molecule_potential_energy_diagram_reaction_mechanism_t&from=search http://www.yteach.co.uk/page.php/resources/view_all?id=reaction_rate_factor_collision_theory_temperature_concentration_reactant_pressure_page_1&from=search New products must be formed There must be proof of an accident (scratch, dent etc.) The collision must have enough energy to break apart the particles Cars must damage (something breaks) Reactant particles must collide Cars must collide Conditions for a successful chemical reaction Conditions for a car accident