CH 16 A Model For Reaction Rates

Question 1

Reaction rate

Answer 1

I a chemical reaction Is the changes in concentration of a reactant or product per unit of time generally expressed as a mol/(L•s)

Question 2

True or false:
Reaction rates cannot be calculated from balanced equations

Answer 2

True

Question 3

Average reaction rate equation

Answer 3

Average reaction rate = - change of reactant / change in time

Question 4

What are the 2 points of Collision theory

Answer 4

1.) atoms ions and molecules must collide in order to react

2.) reacting substances must collide in correct orientation

3.) must collide with sufficient energy to form an activated complex


Question 5

Activated complex

Answer 5

Sometimes called a transition strip is a temporary unstable arrangement of atoms in which Old bonds are breaking and new bonds are forming.

As a result the activated complex might form products or might break a part to reform the reactants

Question 6

Activation energy

Answer 6

The minimum amount of energy that reacting particles must have to form the activated complex and lead to a reaction

Question 7

Ea

Answer 7

Activation energy

Question 8

high Ea means…

Answer 8

That relatively few collisions have the required energy to produce the activated complex and the reaction rate is slow

Ex. Pushing heavy cart up a hill 

Question 9

Low Ea means…

Answer 9

Means that more collisions have sufficient energy to react and the reaction rate is faster

Ex. Pushing a heavy cart down a hill

Question 10

True or false from any reactions to process from reactants to products is irreversible

Answer 10

False: it’s reversible

Question 11

True or false:
Change in free energy has nothing to do with the speed of the reaction

Answer 11

True