Ch. 12

Question 0

Ineffective collisions

Answer 0

Rebound elastically

No activated complex formed

Question 1

Effective collisions?

Answer 1

Proper orientation & sufficient energy

Question 2

Activated complex

Answer 2

Highly unstable

Chemical entity containing collided reactants

Question 3

Activation energy

Answer 3

Energy barrier that must be overcome for a chemical reaction to occur

Question 4

Energy pathway

Answer 4

Energy of a chemical system as it moves from reactants, activated complex, & products

Question 5

Exothermic reactions

Answer 5

Once begun, drive themselves
Spontaneous 
Smaller activation energy
Higher rate of reaction
Bond making (releases energy)

Question 6

Endothermic reactions

Answer 6

Need constant energy supplied
Non-spon
Large activation energy 
Slower rate of reaction 
Bond breaking (requires energy)

Question 7

Bond energy

Answer 7

Energy required to break & energy released to form a chemical bond

Question 8

Catalysts

Answer 8

Not used in rxn
Reduces activation energy (alternative lower energy pathway)
Doesnt change net enthalpy change
Allow for use of lower temperatures

Question 9

Reaction mechanism

Answer 9

Individual rxn steps & intermediates formed (catalyzed rxn)

Question 10

Intermediates

Answer 10

Chemical entities formed at each end in a reaction mechanism
Activated complex- the highest pt