Section 13.4- Effects of a Catalyst

Question 1

a substance that increases the rate of a chemical reaction without being consumed in the reaction

Answer 1

catalyst

Question 2

a catalyst cannot make an ________________________________; it only aids reactions _________________________

Answer 2

impossible reaction possible
that are already there

Question 3

increases the rate of reaction by providing an easier route that has a lower activation energy

Answer 3

catalyst

Question 4

a catalyst is not ___________________ in a reaction

Answer 4

consumed

Question 5

a catalyst provides an easier route by

Answer 5

lowering the activation energy

Question 6

delta H for catalyzed and uncatalyzed reactions is

Answer 6

the same

Question 7

catalyzed and uncatalyzed delta H reactions are the same because H is a

Answer 7

state function

Question 8

effects of a catalyst on a reaction

Answer 8

1. reaction rate more rapid
2. energies of products and reactants are unchanged
3. delta H is unchanged
4. an alternative rout or mechanism with a lower activation energy is provided
5. catalysts only aid reactions that are already possible

Question 9

catalysts that exist in the SAME phase as the reactants are

Answer 9

homogeneous catalysts

Question 10

a catalyst that is not in the same phase as the reactants is a

Answer 10

heterogeneous catalyst (i.e. solids such as metals in which reactants are gaseous or liquid)

Question 11

means attracting to a solid surface

Answer 11

adsorbing

Question 12

solids are often called

Answer 12

surface catalysts

Question 13

a group of very important catalysts found in living cells and organs are

Answer 13

protein catalysts or ENZYMES

Question 14

enzymes are very ______________ and very ______________

Answer 14

specific
efficient

Question 15

substances that slow the rate of a chemical reaction are called

Answer 15

inhibitors