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Enzymes and Chemical Reactions

Total questions: 20

Worksheet time: 20mins

Name
Class
Date
1.
The energy needed to start a chemical reaction
a)
Catalyst
b)
Activation Energy
c)
Substrates
d)
Reactants
2.
Look at this reaction graph. Which of the following is NOT true of this reaction?
a)
The reactants have lower energy than the product
b)
This is showing an endothermic reaction
c)
Activation energy was not needed for this to occur
d)
The product has more energy than the reactants
3.

Which of the following statements is TRUE of enzymes?.

a)

Enzymes are not found in living organisms

b)

Enzymes help to speed up chemical reactions

c)

Enzymes are made carbohydrates

d)

Enzymes increase the activation energy of a chemical reaction

4.
In this diagram A is the
a)
substrate
b)
enzyme
c)
enzyme-substrate complex
d)
product
5.

Enzymes are also considered to be biological ____________

a)

catalysts

b)

organisms

c)

life

d)

denatures

6.
The substance(s) that enter an enzyme and are either joined or broken apart
a)
Reactants
b)
Products
c)
Substrates
d)
Denatures
7.
The area of an enzyme where the substrate binds to the enzyme
a)
Product
b)
Active Site
c)
Catalyst
d)
Complex
8.
In living things many enzymes are ________
a)
carbohydrates
b)
nucleic acids
c)
lipids
d)
proteins
9.
In this diagram B is the
a)
substrate
b)
active site
c)
enzyme-substrate complex
d)
product
10.
Most enzymes end in......?
a)
-ose
b)
-itin
c)
-ase
d)
-ome
11.
Which molecules in this reaction are the products?
a)

CH4 and O2

b)
H2O and O2
c)
CO2 and H20
d)
CH4 and H20
12.
Which molecules in this reaction are the reactants?
a)

CH4 and O2

b)
H2O and O2
c)
CO2 and H20
d)
CH4 and H20
13.

What term is used to describe the process of an enzyme changing shape due to extreme heat or pH levels?

a)
depolarize
b)

catalyze

c)
polymerize
d)
denature
14.
In this diagram the enzyme-substrate complex =
a)
A
b)
C
c)
E
d)
D
15.
A reaction in which energy is absorbed is called
a)
endothermic
b)
exothermic
c)
introverted
d)
exceptionally thermic
16.
A reaction where energy is RELEASED to the environment
a)
Exothermic
b)
Endothermic
c)
Polythermic
d)
Batman
17.
Which of the following is true of the below reaction?
a)
There is one reactant and two products involved
b)
This is an exothermic reaction
c)
This is comparing the reaction rate with an enzyme vs without an enzyme
d)
Energy is absorbed by this reaction
18.
Which of the following accurately describes this graph?
a)
Green reaction has an enzme so less energy is used than the purple reaction
b)
This reaction is endothermic and absorbing energy from its surroundings.
c)
The activation energy is the same for both the purple and green reactions.
d)
Different products are produced in the green reaction and purple reaction.
19.

Which of the following applies to endothermic reactions?

a)

They feel cold and absorb energy

b)

They feel hot and absorb energy

c)

They feel hot and release energy

d)

They feel cold and release energy

20.

Which of the following applies to exothermic reactions?

a)

They feel cold and absorb energy

b)

They feel hot and absorb energy

c)

They feel hot and release energy

d)

They feel cold and release energy

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