The collision theory explains how chemical reactions occur and why different reactions have different reaction rates. the idea behind the theory basically states thet atoms must collide in order for a chemical reaction to take place. if this theory is true, what would happen in a chemical reaction if you were to increase the concentration of hcl in the reaction:

The rate of reaction will increase

Explanation:

According to the collision theory, the rate of reaction increases with increase in the number of colliding reactant particles. The more number of particles present, the more effective collisions that occur between reactants and the greater the rate of reaction.

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