Question 1

A coke has a pH of 3.5. This means that it has an excess of _______ ions and would be called a(n)  _____.

Accepted Answer

A)   H+; acid
B)   OH-; acid
C)   H+; base
D)   OH-; base
E)   H+; neutral solutionF) B) and C)
G) B) and E) A

Question 2

After drinking a great deal of coffee (pH 5) , a human's blood buffering system would need to ___ as the coffee was digested to lower the level of acid present in the blood stream.

Accepted Answer

A)   release OH-
B)   take up H+
C)   release H+
D)   take up OH-
E)   release OH- and take up H+F) None of the above
G) B) and C)

Question 3

Why do cells need buffering agents?

Accepted Answer

A)   to minimize the changes in pH of their internal environment
B)   to operate at a constant pH of 2.0
C)   to carry out life functions in extremely acidic conditions
D)   to help transfer electrons from one atom to another
E)   to increase the amount of OH- in their surroundingsF) None of the above
G) C) and D)

Question 4

In the reaction 6CO2 + 6H2O → C6H12O6 + 6O2 carbon dioxide is one of the _______.

Accepted Answer

A)   reactants
B)   products
C)   enzymes
D)   elements
E)   catalystsF) A) and B)
G) A) and E)

Question 5

You are caring for the freshwater aquarium of a friend while they are on vacation. You are told to check the pH of the tank and make sure that it stays between 6.5 and 7.0. In order to assure that you do not have to worry about the pH you

Accepted Answer

A)   treat the fish and the tank with aspirin.
B)   add NaOH so that changes in the tank are calculated.
C)   add HCl so that you can track the changes in the tank's pH.
D)   do nothing since the pH will not change unless you do something wrong and you plan to follow the directions exactly.
E)   add a buffer so changes in pH are minimized.F) A) and B)
G) C) and D)

Question 6

You are caring for the freshwater aquarium of a friend while they are on vacation. You are told to check the pH of the tank and make sure that it stays between 6.5 and 7.0. When you check the water the pH is 8.0. The water in the tank is

Accepted Answer

A)   1 to 1.5 times more basic than it should be.
B)   1 to 1.5 times more acidic than it should be.
C)   10 to 15 times more basic than it should be.
D)   10 to 15 times more acidic than it should be.
E)   100 to 150 times more basic than it should be.F) A) and D)
G) C) and D)

Question 7

Isotopes of an element differ in their _____.

Accepted Answer

A)   proton number
B)   electron number
C)   neutron number
D)   type of bonds
E)   atomic numberF) A) and B)
G) A) and C)

Question 8

Bases can ________.

Accepted Answer

A)   release only hydrogen ions
B)   take up only hydrogen ions
C)   release only hydroxide ions
D)   both take up hydrogen ions and release hydroxide ions
E)   release hydrogen and release hydroxideF) C) and E)
G) A) and B) D

Question 9

What do lemons, tomatoes, and coffee all have in common chemically?

Accepted Answer

A)   They are all foods that people consume.
B)   They all produce (H+)  in solution, making them acids.
C)   They all are fruits.
D)   They all taste bitter.
E)   They are all slippery to the touch.F) A) and B)
G) C) and E)

Question 10

Which of the following explains the events occurring when water boils?

Accepted Answer

A)   Hydrogen bonds are broken between neighbor water molecules.
B)   Covalent bonds are broken between oxygen and hydrogen atoms.
C)   Ionic bonds are broken when the minerals in water are heated.
D)   The bond between one water molecule and another is strengthened.
E)   The hydrogen atoms break away from the oxygen and escape as vapor.F) D) and E)
G) A) and D)

Question 11

The number of neutrons in the nucleus of an average atom of an element is best estimated by

Accepted Answer

A)   adding the number of electrons and protons together.
B)   subtracting the number of electrons from the number of protons.
C)   adding the mass number to the number of electrons.
D)   subtracting the number of protons from the mass number.
E)   adding the atomic number and atomic mass together.F) A) and B)
G) B) and E)

Question 12

Which of the following is not one of the most common elements in living things?

Accepted Answer

A)   carbon
B)   oxygen
C)   hydrogen
D)   iron
E)   nitrogenF) D) and E)
G) A) and D) D

Question 13

All atoms of the same element have the same

Accepted Answer

A)   number of neutrons.
B)   atomic number.
C)   number of electrons.
D)   atomic mass.
E)   number of ions.F) A) and E)
G) B) and E)

Question 14

An atom with a neutral charge has

Accepted Answer

A)   equal numbers of neutrons and electrons.
B)   more neutrons making it more neutral.
C)   the same number of protons and neutrons.
D)   equal numbers of protons and electrons.
E)   more protons than it does electrons.F) D) and E)
G) C) and E)

Question 15

Elements differ from each other in their ________.

Accepted Answer

A)   physical properties only
B)   atomic number only
C)   type of subatomic particles
D)   physical properties and atomic number
E)   type of electronsF) B) and C)
G) A) and E)

Question 16

Of the following examples which best demonstrates the property of water cohesion?

Accepted Answer

A)   Water can move up a 100 foot pine tree from the roots to the leaves.
B)   A rock skipping across the surface of a lake.
C)   Water requires a great deal of heat to reach the point of vaporizing.
D)   A soda can bursts when it is placed in the freezer.
E)   A large body of fresh water takes a long time to warm up after the winter season.F) B) and C)
G) A) and C)

Question 17

When hot chocolate mix is added to water the hot chocolate is the ______ and the water is the ________.

Accepted Answer

A)   solvent; solute
B)   molecule; compound
C)   solute; solvent
D)   compound; molecule
E)   element; compoundF) A) and B)
G) D) and E)

Question 18

An atom's outermost electron shell

Accepted Answer

A)   is filled when it has three electrons.
B)   determines its chemical reactivity.
C)   determines its atomic mass.
D)   is filled with positively charged particles.
E)   is filled identically for every element.F) B) and E)
G) None of the above

Question 19

Which of these is a property of isotopes that make it useful in cell biology?

Accepted Answer

A)   they never breakdown
B)   they behave the same chemically
C)   they behave differently chemically
D)   the molecules they are part of break down more easily
E)   the molecules they are part of are more stableF) B) and D)
G) All of the above

Question 20

The electron arrangement for argon, which has 18 electrons, is

Accepted Answer

A)   2 in the inner energy shell, 8 in the second energy shell and 8 in the outer energy shell
B)   8 in the inner energy shell, 8 in the second energy shell and 2 in the outer energy shell
C)   6 in the inner energy shell, 6 in the second energy shell and 6 in the outer energy shell
D)   5 in the inner energy shell, 6 in the second energy shell and 7 in the outer energy shell
E)   7 in the inner energy shell, 6 in the second energy shell and 5 in the outer energy shellF) C) and E)
G) C) and D)

Exam 2: The Chemical Basis of Life

A coke has a pH of 3.5. This means that it has an excess of _______ ions and would be called a(n) _____.

Correct AnswerverifiedA

After drinking a great deal of coffee (pH 5) , a human's blood buffering system would need to ___ as the coffee was digested to lower the level of acid present in the blood stream.

Correct AnswerverifiedShow Answer

Why do cells need buffering agents?

Correct AnswerverifiedShow Answer

In the reaction 6CO2 + 6H2O → C6H12O6 + 6O2 carbon dioxide is one of the _______.

Correct AnswerverifiedShow Answer

You are caring for the freshwater aquarium of a friend while they are on vacation. You are told to check the pH of the tank and make sure that it stays between 6.5 and 7.0. In order to assure that you do not have to worry about the pH you

Correct AnswerverifiedShow Answer

You are caring for the freshwater aquarium of a friend while they are on vacation. You are told to check the pH of the tank and make sure that it stays between 6.5 and 7.0. When you check the water the pH is 8.0. The water in the tank is

Correct AnswerverifiedShow Answer

Isotopes of an element differ in their _____.

Correct AnswerverifiedShow Answer

Bases can ________.

Correct AnswerverifiedD

What do lemons, tomatoes, and coffee all have in common chemically?

Correct AnswerverifiedShow Answer

Which of the following explains the events occurring when water boils?

Correct AnswerverifiedShow Answer

The number of neutrons in the nucleus of an average atom of an element is best estimated by

Correct AnswerverifiedShow Answer

Which of the following is not one of the most common elements in living things?

Correct AnswerverifiedD

All atoms of the same element have the same

Correct AnswerverifiedShow Answer

An atom with a neutral charge has

Correct AnswerverifiedShow Answer

Elements differ from each other in their ________.

Correct AnswerverifiedShow Answer

Of the following examples which best demonstrates the property of water cohesion?

Correct AnswerverifiedShow Answer

When hot chocolate mix is added to water the hot chocolate is the ______ and the water is the ________.

Correct AnswerverifiedShow Answer

An atom's outermost electron shell

Correct AnswerverifiedShow Answer

Which of these is a property of isotopes that make it useful in cell biology?

Correct AnswerverifiedShow Answer

The electron arrangement for argon, which has 18 electrons, is

Correct AnswerverifiedShow Answer

A coke has a pH of 3.5. This means that it has an excess of ___ ions and would be called a(n) _.

Correct Answer
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In the reaction 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ carbon dioxide is one of the _______.

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When hot chocolate mix is added to water the hot chocolate is the and the water is the __.

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