Question 1

Select the correct statement about isotopes.

Accepted Answer

A)   All the isotopes of an element are radioactive.
B)   Isotopes of the same element have the same atomic number but differ in their mass number.
C)   Isotopes occur only in the heavier elements.
D)   All the isotopes of an element have the same number of neutrons but differing numbers of electrons.E) B) and C)
F) B) and D)

Question 2

Protons and electrons exist in every atom nucleus except hydrogen. Is this statement true or false and why?

Accepted Answer

False. Hydrogen has one proton and one electron. It is the neutron, not the electron that can coexist in the nucleus and that hydrogen does not have.

Question 3

A dipeptide can be broken into two amino acids by dehydration synthesis.

Accepted Answer

A) True 
 B)False

Question 4

Sucrose is a________.

Accepted Answer

A)   triglyceride
B)   monosaccharide
C)   disaccharide
D)   polysaccharideE) B) and C)
F) A) and D) C

Question 5

Hydrogen bonds are too weak to bind atoms together to form molecules, but they do hold different parts of a single large molecule in a specific three-dimensional shape.

Accepted Answer

A) True 
 B)False

Question 6

A charged particle is generally called an ion or electrolyte.

Accepted Answer

A) True 
 B)False

Question 7

The fact that no chemical bonding occurs between the components of a mixture is the chief difference between mixtures and compounds.

Accepted Answer

A) True 
 B)False

Question 8

What advantages does ATP have in being the energy currency molecule?

Accepted Answer

Its energy is easy to capture and store;...

Question 9

Atom X has 17 protons. How many electrons are in its valence shell (outermost energy level) ?

Accepted Answer

A)   3
B)   10
C)   7
D)   5E) A) and D)
F) None of the above

Question 10

Starch is the stored carbohydrate in plants, while ________ is the stored carbohydrate in animals.

Accepted Answer

A)   glucose
B)   triglyceride
C)   cellulose
D)   glycogenE) None of the above
F) A) and B)

Question 11

How can phospholipids form a film when mixed in water?

Accepted Answer

Phospholipids have both polar ...

Question 12

A high fever causes an enzyme to lose its three dimensional structure and function. Which bonds are broken when a protein denatures?

Accepted Answer

A)   ionic bonds
B)   non-polar covalent bonds
C)   polar covalent bonds
D)   hydrogen bondsE) All of the above
F) C) and D)

Question 13

Which of the following is a general function for a fibrous protein?

Accepted Answer

A)   transport
B)   catalysis
C)   protein management
D)   structural framework
E)   body defenseF) A) and B)
G) C) and D)

Question 14

What is the ratio of fatty acids to glycerol in triglycerides (neutral fats) ?

Accepted Answer

A)   3:1
B)   1:1
C)   2:1
D)   4:1E) C) and D)
F) B) and C) A

Question 15

Which of the following is not considered a factor in influencing a reaction rate?

Accepted Answer

A)   time
B)   particle size
C)   concentration of reactants
D)   temperatureE) None of the above
F) C) and D)

Question 16

ATP · ADP + Pi is an example of a(n)  ________ reaction.

Accepted Answer

A)   reversible
B)   decomposition
C)   exchange
D)   synthesisE) A) and C)
F) C) and D)

Question 17

When DNA is replicated, it is necessary for the two strands to "unzip" temporarily. Choose which bonding type is most appropriate for holding the strands together in this way.

Accepted Answer

A)   polar covalent bonding
B)   non-polar covalent bonding
C)   hydrogen bonding
D)   ionic bondingE) A) and B)
F) C) and D)

Question 18

Which property of water is demonstrated when we sweat?

Accepted Answer

A)   cushioning
B)   high heat of vaporization
C)   reactivity
D)   high heat capacity
E)   polar solvent propertiesF) A) and C)
G) D) and E)

Question 19

An amino acid may act as a proton acceptor or donor. Explain.

Accepted Answer

Amino acids have two component...

Question 20

All chemical reactions are theoretically reversible. Comment on this statement.

Accepted Answer

It is possible to reverse any reaction i...

Exam 2: Chemistry Comes Alive

Select the correct statement about isotopes.

Correct AnswerverifiedShow Answer

Protons and electrons exist in every atom nucleus except hydrogen. Is this statement true or false and why?

Correct AnswerverifiedFalse. Hydrogen has one proton and one electron. It is the neutron, not the electron that can coexist in the nucleus and that hydrogen does not have.

A dipeptide can be broken into two amino acids by dehydration synthesis.

Correct AnswerverifiedShow Answer

Sucrose is a________.

Correct AnswerverifiedC

Hydrogen bonds are too weak to bind atoms together to form molecules, but they do hold different parts of a single large molecule in a specific three-dimensional shape.

Correct AnswerverifiedShow Answer

A charged particle is generally called an ion or electrolyte.

Correct AnswerverifiedShow Answer

The fact that no chemical bonding occurs between the components of a mixture is the chief difference between mixtures and compounds.

Correct AnswerverifiedShow Answer

What advantages does ATP have in being the energy currency molecule?

Correct AnswerverifiedIts energy is easy to capture and store;...View AnswerShow Answer

Atom X has 17 protons. How many electrons are in its valence shell (outermost energy level) ?

Correct AnswerverifiedShow Answer

Starch is the stored carbohydrate in plants, while ________ is the stored carbohydrate in animals.

Correct AnswerverifiedShow Answer

How can phospholipids form a film when mixed in water?

Correct AnswerverifiedPhospholipids have both polar ...View AnswerShow Answer

A high fever causes an enzyme to lose its three dimensional structure and function. Which bonds are broken when a protein denatures?

Correct AnswerverifiedShow Answer

Which of the following is a general function for a fibrous protein?

Correct AnswerverifiedShow Answer

What is the ratio of fatty acids to glycerol in triglycerides (neutral fats) ?

Correct AnswerverifiedA

Which of the following is not considered a factor in influencing a reaction rate?

Correct AnswerverifiedShow Answer

ATP · ADP + Pi is an example of a(n) ________ reaction.

Correct AnswerverifiedShow Answer

When DNA is replicated, it is necessary for the two strands to "unzip" temporarily. Choose which bonding type is most appropriate for holding the strands together in this way.

Correct AnswerverifiedShow Answer

Which property of water is demonstrated when we sweat?

Correct AnswerverifiedShow Answer

An amino acid may act as a proton acceptor or donor. Explain.

Correct AnswerverifiedAmino acids have two component...View AnswerShow Answer

All chemical reactions are theoretically reversible. Comment on this statement.

Correct AnswerverifiedIt is possible to reverse any reaction i...View AnswerShow Answer

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False. Hydrogen has one proton and one electron. It is the neutron, not the electron that can coexist in the nucleus and that hydrogen does not have.

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C

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Its energy is easy to capture and store;...
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Phospholipids have both polar ...
View Answer

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A

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Amino acids have two component...
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It is possible to reverse any reaction i...
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