Question 1

Membrane lipids contain long chains of H-C-H groups joined by C-C bonds. Which interaction is most likely occurring between lipids in the membrane?

Accepted Answer

A)   hydrogen bonds
B)   Van der Waals
C)   ionic
D)   covalentE) A) and D)
F) B) and C)

Question 2

Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water. When salt dissolves in water, individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules. Why would this cause ice to melt?

Accepted Answer

A)   Hydrogen bonds are broken, and the salt ions interfere with interactions between H and O. As a result, it is more difficult for water molecules to bond and form ice.
B)   Hydrogen bonds are formed, and the salt ions bond with O. As a result, it is more difficulty for water molecules to bond and form ice.
C)   Hydrogen bonds are broken, and the salt ions bond with O and H respectively. As a result, it is more difficult for water molecules to bond and form ice.D) B) and C)
E) None of the above A

Question 3

You identify an enzyme involved in a cellular reaction. How does the enzyme affect the reaction equilibrium between reactants and products and the time needed to reach equilibrium?

Accepted Answer

A)   It alters the reaction equilibrium and shortens the time needed to reach equilibrium.
B)   The reaction equilibrium is unaffected, but it shortens the time needed to reach equilibrium.
C)   It alters the reaction equilibrium and lengthens the time needed to reach equilibrium.
D)   The reaction equilibrium is unaffected, but it lengthens the time needed to reach equilibrium.E) B) and C)
F) C) and D) B

Question 4

The common basilisk lizard will run across water on its hind legs in an erect position when startled by predators. This lizard has large feet and flaps of skin along its toes. What properties of water allow this lizard to walk on water?

Accepted Answer

A)   Hydrogen bonds absorb heat when they break and release heat when they form. This helps to minimize temperature changes.
B)   Polar molecules are attracted to ions and polar compounds, making these compounds soluble.
C)   Hydrogen bonds hold water molecules together; many hydrogen bonds must be broken for water to evaporate.
D)   The surface tension created by hydrogen bonds is greater than the weight of the lizard initially.E) B) and D)
F) C) and D)

Question 5

Cl has 7 electrons in its outer shell and K has 1 electron in its outer shell. How is the bond in Cl2  different from the bond in KCl?

Accepted Answer

A)   Cl2 is covalent and KCl is ionic.
B)   Cl2 and KCl are both ionic.
C)   Cl2 is ionic and KCl is covalent.D) B) and C)
E) A) and B)

Question 6

According to most car mechanics, plain water is the best coolant to use in an engine provided the engine is not being exposed to freezing temperatures. If the car is subject to freezing temperatures then a mixture of water and ethylene glycol (antifreeze)  is recommended but it does not cool as efficiently as plain water. Why would ethylene glycol reduce the cooling efficiency of water?

Accepted Answer

A)   Hydrogen bonds in water allow high levels of heat absorption and a large increase in temperature.
B)   Ethylene glycol has a higher heat capacity than water.
C)   Ethylene glycol has a lower heat capacity than water.
D)   Ethylene glycol raises the freezing point of water.E) B) and C)
F) A) and D)

Question 7

Your dog becomes ill and you rush him to the veterinarian's office. A technician draws blood from your dog's leg for a vet-ordered lab test. After a few minutes the lab results are given to the vet, who immediately grabs a bottle from a shelf and begins to fill a syringe with an unknown fluid. You inquire about the fluid, and the vet informs you that the fluid is necessary to manage your dog's metabolic acidosis. Based on the information provided, what is acidosis, and what is the likely effect of the veterinarian's injection? Acidosis means that your dog's blood pH has ______ from its normal level, and an injection of _____ is required to reverse the condition.

Accepted Answer

A)   dropped, water
B)   increased, water
C)   decreased, buffering solution
D)   increased, buffering solutionE) C) and D)
F) A) and C)

Question 8

Sulfur is found directly below Oxygen on the periodic table. What type of bond would you predict S-H would form?

Accepted Answer

A)   Polar covalent
B)   Hydrogen bond
C)   Ionic
D)   Non-polar covalent bondE) A) and B)
F) A) and C)

Question 9

The half-life of Carbon-14 is approximately 5,700 years. Using this information scientists have been able to determine the age of some artifacts left by humans. A scientist wants to know approximately how old a piece of wood was that she found on the floor in an old cave that had recently been discovered. She removed the wood (with permission)  to her laboratory. Her wood sample contained 2 grams of Carbon-14. If the age of the wood was determined to be 22,800 years old, how much Carbon-14 originally existed in this piece of wood?

Accepted Answer

A)   32 grams
B)   16 grams
C)   12 grams
D)   8 grams
E)   4 gramsF) All of the above
G) D) and E) A

Question 10

Which chemical group forms hydrogen bonds with water and is most likely to explain why sugars dissolve well in water?

Accepted Answer

A)   -C-H
B)   -N-H
C)   -C-C
D)   -O-HE) B) and C)
F) B) and D)

Question 11

Water is most dense and thus heaviest at 4oC. At 0oC, ice forms and can float on liquid water. Suppose ice were most dense at 0oC. What would happen in a lake?

Accepted Answer

A)   The ice would cover the bottom of the aquatic system and would build up in layers over time.
B)   Ice would not form because solids are always less dense than liquids.
C)   The ice would cover the surface of the aquatic system and would never melt.
D)   The cold temperatures and the subsequent ice formation would prevent hydrogen bonds from forming between the water molecules, thus causing the existing ice crystals to become disassociated from each other.E) A) and B)
F) A) and C)

Question 12

Capillary action is one of the forces that aids water's upward movement in plants. The narrower the diameter of the tube, the farther the water column will rise. Capillary action is a result of water molecules:

Accepted Answer

A)   having an adhesive force, which allows them to attach to the vessel walls.
B)   being associated with hydrophobic molecules, which can result in upward movement.
C)   producing sufficient surface tension to overcome the pull of gravity.
D)   having a strong cohesive force and attaching to the surrounding vessel walls.
E)   storing heat and thus moving faster because of heat of vaporization.F) B) and C)
G) B) and E)

Question 13

The electronic configuration of the noble gas Neon, which has an atomic number of 10, can be written as follows: 1s22s22p6. What is the electronic configuration of the noble gas Argon, which has an atomic number of 18?

Accepted Answer

A)   1s22s83p8
B)   1s22s22p63s23p6
C)   1s22s62p23s63p2
D)   1s22s23p64s25p6E) B) and D)
F) B) and C)

Question 14

An oxygen atom in water has two covalent bonds with hydrogen atoms and two unpaired electrons. How many hydrogen bonds can a water molecule form?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) C) and D)
G) A) and D)

Question 15

As you and a friend are entering a chemistry laboratory at your university, you see a sign that states: DANGER-RADIOACTIVE ISOTOPES IN USE. Your friend is an accounting major and has not had any science courses yet. She asks you what a radioactive isotope is and you respond correctly with:

Accepted Answer

A)   Radioactive isotopes are atoms that are unstable and as a result emit energy in a process called radioactive decay.
B)   Radioactive isotopes are atoms that are stable and as a result emit energy in a process called radioactive decay.
C)   Radioactive isotopes are atoms that are stable and as a result only emit energy if they are exposed to higher temperatures.
D)   Radioactive isotopes are atoms that are unstable but unless actively disturbed by some chemical process will remain intact and pose no problems.E) A) and D)
F) None of the above

Exam 2: The Nature of Moleculars and the Properties of Water

Membrane lipids contain long chains of H-C-H groups joined by C-C bonds. Which interaction is most likely occurring between lipids in the membrane?

Correct Answer
verified

Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water. When salt dissolves in water, individual Na⁺ and Cl^- ions break away from the salt lattice and become surrounded by water molecules. Why would this cause ice to melt?

Correct Answer
verified
A

You identify an enzyme involved in a cellular reaction. How does the enzyme affect the reaction equilibrium between reactants and products and the time needed to reach equilibrium?

Correct Answer
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B

The common basilisk lizard will run across water on its hind legs in an erect position when startled by predators. This lizard has large feet and flaps of skin along its toes. What properties of water allow this lizard to walk on water?

Correct Answer
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Cl has 7 electrons in its outer shell and K has 1 electron in its outer shell. How is the bond in Cl₂different from the bond in KCl?

Correct Answer
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Correct Answer
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Correct Answer
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Sulfur is found directly below Oxygen on the periodic table. What type of bond would you predict S-H would form?

Correct Answer
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Correct Answer
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A

Which chemical group forms hydrogen bonds with water and is most likely to explain why sugars dissolve well in water?

Correct Answer
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Water is most dense and thus heaviest at 4^oC. At 0^oC, ice forms and can float on liquid water. Suppose ice were most dense at 0^oC. What would happen in a lake?

Correct Answer
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Capillary action is one of the forces that aids water's upward movement in plants. The narrower the diameter of the tube, the farther the water column will rise. Capillary action is a result of water molecules:

Correct Answer
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The electronic configuration of the noble gas Neon, which has an atomic number of 10, can be written as follows: 1s²2s²2p⁶. What is the electronic configuration of the noble gas Argon, which has an atomic number of 18?

Correct Answer
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An oxygen atom in water has two covalent bonds with hydrogen atoms and two unpaired electrons. How many hydrogen bonds can a water molecule form?

Correct Answer
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As you and a friend are entering a chemistry laboratory at your university, you see a sign that states: DANGER-RADIOACTIVE ISOTOPES IN USE. Your friend is an accounting major and has not had any science courses yet. She asks you what a radioactive isotope is and you respond correctly with:

Correct Answer
verified

Exam 2: The Nature of Moleculars and the Properties of Water

Membrane lipids contain long chains of H-C-H groups joined by C-C bonds. Which interaction is most likely occurring between lipids in the membrane?

Correct AnswerverifiedShow Answer

Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water. When salt dissolves in water, individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules. Why would this cause ice to melt?

Correct AnswerverifiedA

You identify an enzyme involved in a cellular reaction. How does the enzyme affect the reaction equilibrium between reactants and products and the time needed to reach equilibrium?

Correct AnswerverifiedB

The common basilisk lizard will run across water on its hind legs in an erect position when startled by predators. This lizard has large feet and flaps of skin along its toes. What properties of water allow this lizard to walk on water?

Correct AnswerverifiedShow Answer

Cl has 7 electrons in its outer shell and K has 1 electron in its outer shell. How is the bond in Cl2 different from the bond in KCl?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Sulfur is found directly below Oxygen on the periodic table. What type of bond would you predict S-H would form?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedA

Which chemical group forms hydrogen bonds with water and is most likely to explain why sugars dissolve well in water?

Correct AnswerverifiedShow Answer

Water is most dense and thus heaviest at 4oC. At 0oC, ice forms and can float on liquid water. Suppose ice were most dense at 0oC. What would happen in a lake?

Correct AnswerverifiedShow Answer

Capillary action is one of the forces that aids water's upward movement in plants. The narrower the diameter of the tube, the farther the water column will rise. Capillary action is a result of water molecules:

Correct AnswerverifiedShow Answer

The electronic configuration of the noble gas Neon, which has an atomic number of 10, can be written as follows: 1s22s22p6. What is the electronic configuration of the noble gas Argon, which has an atomic number of 18?

Correct AnswerverifiedShow Answer

An oxygen atom in water has two covalent bonds with hydrogen atoms and two unpaired electrons. How many hydrogen bonds can a water molecule form?

Correct AnswerverifiedShow Answer

As you and a friend are entering a chemistry laboratory at your university, you see a sign that states: DANGER-RADIOACTIVE ISOTOPES IN USE. Your friend is an accounting major and has not had any science courses yet. She asks you what a radioactive isotope is and you respond correctly with:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water. When salt dissolves in water, individual Na⁺ and Cl^- ions break away from the salt lattice and become surrounded by water molecules. Why would this cause ice to melt?

Correct Answer
verified
A

Correct Answer
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B

Correct Answer
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Cl has 7 electrons in its outer shell and K has 1 electron in its outer shell. How is the bond in Cl₂different from the bond in KCl?

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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A

Correct Answer
verified

Water is most dense and thus heaviest at 4^oC. At 0^oC, ice forms and can float on liquid water. Suppose ice were most dense at 0^oC. What would happen in a lake?

Correct Answer
verified

Correct Answer
verified

The electronic configuration of the noble gas Neon, which has an atomic number of 10, can be written as follows: 1s²2s²2p⁶. What is the electronic configuration of the noble gas Argon, which has an atomic number of 18?

Correct Answer
verified

Correct Answer
verified

Correct Answer
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