Question 1

Carbon has 4 electrons and hydrogen has 1 electron in its outermost electron shell.A carbon atom can form covalent bonds with how many hydrogen atoms?

Accepted Answer

A)  0
B)  1
C)  2
D)  3
E)  4F) None of the above
G) C) and E)

Question 2

Tritiated hydrogen (3H) differs from hydrogen (1H) in that

Accepted Answer

A)  3H has 2 more protons than 1H.
B)  3H has 2 more electrons than 1H.
C)  3H has 2 more neutrons than 1H.
D)  3H has the same number of neutrons as 1H.
E)  3H has a different electron configuration than 1H.F) B) and E)
G) A) and C)

Question 3

For water to vaporize

Accepted Answer

A)  energy must be supplied.
B)  energy must be released.
C)  hydrogen bonds are broken.
D)  both energy must be supplied and hydrogen bonds broken.
E)  both energy must be released and hydrogen bonds broken.F) B) and C)
G) A) and D)

Question 4

A dehydration reaction that builds larger molecules from smaller units requires the addition of a water molecule.

Accepted Answer

A) True 
 B)False

Question 5

The element found in most abundance in living organisms is

Accepted Answer

A)  calcium.
B)  iron.
C)  iodine.
D)  hydrogen.
E)  sodium.F) A) and E)
G) All of the above

Question 6

During photosynthesis the reactants,carbon dioxide and water can become glucose and oxygen.Glucose and oxygen can also be reactants to form water and carbon dioxide.If the two reactions are working at a constant rate this would form a

Accepted Answer

A)  homeostasis.
B)  constant polarity.
C)  universal balance.
D)  chemical equilibrium.E) B) and C)
F) All of the above

Question 7

Carbon and hydrogen have similar electronegativities and combine together to form hydrocarbon molecules.What type of bonds form between these atoms?

Accepted Answer

A)  hydrogen
B)  ionic
C)  polar covalent
D)  nonpolar covalent
E)  electrostaticF) B) and C)
G) B) and E)

Question 8

A significant role played by pH buffers is to

Accepted Answer

A)  prevent fluctuations in the acidity of solutions.
B)  increase the strength of acids and bases.
C)  prevent fluctuations in the salinity of solutions.
D)  limit major shifts in the amount of H+ and OH- in solution.
E)  keep pH low.F) B) and D)
G) B) and E)

Question 9

A bottle of Na in solution and a bottle of Cl in solution are mixed together.What type of bond will be created between the atoms,and what will be the product?

Accepted Answer

A)  Covalent bonds;sodium chlorine
B)  Ionic bonds;table salt
C)  Hydrogen bonds;sodium hydroxide
D)  Carbon bonds;carboxyl groupsE) A) and D)
F) All of the above

Question 10

In water,MgCl2 dissociates into Mg2+ and Cl-.Based on this information what type of bond is involved in the formation of MgCl2?

Accepted Answer

A)  hydrogen
B)  ionic
C)  polar covalent
D)  nonpolar covalent
E)  electrostaticF) A) and E)
G) A) and B)

Question 11

The smallest functional unit and associated structures of a living organism are

Accepted Answer

A)  atoms and their protons,neutrons and electrons.
B)  molecules and their atoms,bonds and electrons.
C)  proteins and amino acids.
D)  cells with nucleus,mitochondria and ER.
E)  water made of hydrogen and oxygen.F) B) and E)
G) A) and D)

Question 12

Based on the colligative properties of water,what would happen if one were to add a solute to water?

Accepted Answer

A)  The freezing point of water would decrease.
B)  The freezing point of water would increase.
C)  The boiling point of water would increase.
D)  Both the freezing point of water would decrease and the boiling point of water would increase.
E)  Nothing would change with respect to the freezing point or boiling point of water.F) B) and C)
G) A) and C)

Question 13

The molarity of a solution is

Accepted Answer

A)  a measure of solute concentration.
B)  the weight of a solid substance.
C)  often expressed as grams per unit volume.
D)  reflects a measure of the amount of oil dissolved in water.
E)  a scientific term for determining the solubility of a substance in water.F) B) and D)
G) A) and D)

Question 14

In the periodic table,the value that refers to the number of protons and neutrons is

Accepted Answer

A)  atomic mass.
B)  molecular molarity.
C)  atomic molarity.
D)  molecular number.E) C) and D)
F) All of the above

Question 15

Molecules are generally rigid structures and rarely change shape.

Accepted Answer

A) True 
 B)False

Question 16

If lithium has an atomic number of 3 then it will have 1 valence electron.

Accepted Answer

A) True 
 B)False

Question 17

The nucleus of an atom is composed of

Accepted Answer

A)  protons.
B)  neutrons.
C)  electrons.
D)  protons and neutrons.
E)  protons and electrons.F) A) and B)
G) B) and E)

Question 18

Five unknown compounds are added to water.Four of the compounds go into solution while one does not.What property does water possess that allows these four compounds to dissolve? Why might the fifth compound not dissolve?

Accepted Answer

A)  The positive and negative charge in water will dissolve many substances;the substance is not structurally similar to water.
B)  The negative charge of water dissolves many substances;the substance is too structurally similar to water.
C)  The positive charge of water dissolves many substances;the substance is too structurally similar to water.
D)  The nonpolar qualities of water dissolves many substances;the substance is not structurally similar to water.E) B) and D)
F) A) and B)

Question 19

You want to simulate the production of carbon dioxide (CO2) in a laboratory setting using carbon and oxygen atoms.What type of reactions do you need to facilitate in order to create CO2?

Accepted Answer

A)  An oxidation,or the gain of an electron,and a reduction,or the loss of an electron.
B)  An oxidation,or the loss and electron,and a reduction,or the loss of an electron.
C)  An oxidation,or the gain of an electron,and a reduction,or the gain of electron.
D)  An oxidation,or the loss of an electron,and a reduction,or the gain of an electron.E) A) and C)
F) A) and B)

Question 20

What type of bonding is likely to occur between two water molecules or strands of DNA?

Accepted Answer

A)  covalent
B)  ionic
C)  hydrogen
D)  both hydrogen and covalent
E)  both hydrogen and ionicF) None of the above
G) C) and D)

Exam 2: The Chemical Basis of Life I: Atoms, Molecules, and Water

In the periodic table,the value that refers to the number of protons and neutrons is

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The molarity of a solution is

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For water to vaporize

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A bottle of Na in solution and a bottle of Cl in solution are mixed together.What type of bond will be created between the atoms,and what will be the product?

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Five unknown compounds are added to water.Four of the compounds go into solution while one does not.What property does water possess that allows these four compounds to dissolve? Why might the fifth compound not dissolve?

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The element found in most abundance in living organisms is

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During photosynthesis the reactants,carbon dioxide and water can become glucose and oxygen.Glucose and oxygen can also be reactants to form water and carbon dioxide.If the two reactions are working at a constant rate this would form a

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What type of bonding is likely to occur between two water molecules or strands of DNA?

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You want to simulate the production of carbon dioxide (CO2) in a laboratory setting using carbon and oxygen atoms.What type of reactions do you need to facilitate in order to create CO2?

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A significant role played by pH buffers is to

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If lithium has an atomic number of 3 then it will have 1 valence electron.

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Carbon has 4 electrons and hydrogen has 1 electron in its outermost electron shell.A carbon atom can form covalent bonds with how many hydrogen atoms?

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A dehydration reaction that builds larger molecules from smaller units requires the addition of a water molecule.

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The nucleus of an atom is composed of

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Carbon and hydrogen have similar electronegativities and combine together to form hydrocarbon molecules.What type of bonds form between these atoms?

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Based on the colligative properties of water,what would happen if one were to add a solute to water?

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The smallest functional unit and associated structures of a living organism are

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Tritiated hydrogen (3H) differs from hydrogen (1H) in that

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Molecules are generally rigid structures and rarely change shape.

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In water,MgCl2 dissociates into Mg2+ and Cl-.Based on this information what type of bond is involved in the formation of MgCl2?

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You want to simulate the production of carbon dioxide (CO₂) in a laboratory setting using carbon and oxygen atoms.What type of reactions do you need to facilitate in order to create CO₂?

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Tritiated hydrogen (³H) differs from hydrogen (¹H) in that

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In water,MgCl₂ dissociates into Mg²⁺ and Cl^-.Based on this information what type of bond is involved in the formation of MgCl₂?

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