Reaction Kinetics Reaction Kinetics The study of the

Reaction Kinetics

Reaction Kinetics The study of the amount of time a reaction will take. What is the following set of equations collectively known as? O 3(g) ® O 2(g) + O(g) +O 3(g) ® 2 O 2(g) +____________ 2 O 3(g) ® 3 O 2(g) A reaction mechanism.

Examine the pictures before you make your Collision Theory response. • In. Picture shows the order (a) to make correct orientation CH I molecule, the I 3 whilebond (b) does must withnot. the • C, Inso order to make a it must collide molecule of CH 3 I from with the C. If it hits an atom of I and a the Br, then a Br, molecule of CH 3 reaction willorientation NOT why is the occur. of the collision important? H I C Br H H C H Br I

How would these molecules have to be oriented for a reaction to occur? Think about the way these reactant molecules would have to be oriented to produce the two products on the right. *hint* N and C are central atoms in their molecules.

Rate Influencing Factors Collision Theory • orientation • . surface area • temperature • concentration / pressure of reactants • presence of a catalyst

Orientation A A I is reacting with the black carbon I B B I H I is reacting with H BWhich should faster because A two are setreact of two substances, or atoms B, do you asthink simple you faster? can get. Why? There is no willasreact orientation involved in B’s collision.

A+B Exothermic Reaction C+D Endothermic Reaction The activation energy (Ea ) is the minimum amount of energy required to initiate a chemical reaction.

Activation Energy. . • . . is energy needed so there is enough energy to break reactant bonds. • . . is the energy needed to get molecules in the correct orientation. • . . is the energy needed to reach the transition state or activated complex Activation energy is always a positive number

A catalyst Which curve represents the reaction that has beenactivation catalyzed? energy. lowers the