Hitting the right spot

The molecules must collide in the right orientation, or hit at the right spot, in order for the reaction to occur. The place on the molecule where the collision must take place is cedled the reactive site. For example, suppose you have an equation showing molecule A-B reacting with C to form C-A and B, like this  

The way this equation is written, the reaction requires that reactant C collide with A-B on the A end of the molecule. 

So for this reaction to occur, there must be a collision between C cmd A-B at the reactive site. 

Note that this example is a simple one. I ve assumed that only one collision is needed, making this a one-step reaction. Many reactions are one-step, but memy others require several steps 

Energy is required to break a bond between atoms. For instance, look at the sample equation A-B + C C-A + B. The collision between C and A-B has to transfer enough energy to break the A-B bond, allowing the C-A bond to form. 

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