Question 1

Mendeleev found that when he arranged the known elements according to their atomic mass,the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements.This led to the generalization now known as:

Accepted Answer

A)  an atomic model.
B)  valance electrons.
C)  the periodic table.
D)  the octet rule.E) None of the above
F) All of the above

Question 2

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) A) and E)
G) B) and E)

Question 3

Sodium has 11 electrons arranged in three energy levels.In order to become stable,sodium forms an ion with:

Accepted Answer

A)  no charge.
B)  -1 charge.
C)  -8 charge.
D)  +1 charge.
E)  +8 charge.F) All of the above
G) None of the above

Question 4

After taking your biology exam,you return to your car only to find that you had left the lights on and now the car battery is dead.Your friend offers to jump-start your car,but when you go to hook up the jumper cables you find that the battery terminals are covered with corrosion due to battery acid condensation.Based off your knowledge,what substance could be used to clean the corrosion?

Accepted Answer

A)  coffee (pH of 5) 
B)  water (pH of 7) 
C)  vinegar (pH of 3) 
D)  baking soda (pH of 9) E) A) and B)
F) None of the above

Question 5

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?

Accepted Answer

A)  Acidosis means that your dog's blood pH has dropped from its normal level,and an injection of saline is required to reverse the condition.
B)  Acidosis means that your dog's blood pH has increased from its normal level,and an injection of saline is required to reverse the condition.
C)  Acidosis means that your dog's blood pH has decreased from its normal level,and an injection of buffering solution is required to reverse the condition.
D)  Acidosis means that your dog's blood pH has increased from its normal level,and an injection of buffering solution is required to reverse the condition.E) A) and D)
F) A) and C)

Question 6

The carbonic acid and bicarbonate buffer in blood is extremely important to help maintain homeostasis.What would happen to the pH of the blood if bicarbonate were removed?

Accepted Answer

A)  Removing bicarbonate from the blood would increase the pH
B)  Removing bicarbonate from the blood would decrease the pH
C)  Removing bicarbonate from the blood would not affect the pHD) All of the above
E) A) and B)

Question 7

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

Accepted Answer

A)  The ice would cover the surface of the aquatic system and would never melt.
B)  The ice would cover the bottom of the aquatic system and would build up in layers over time.
C)  Ice would not form because solids are always less dense than liquids.
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 D)
F) B) and C)

Question 8

Water molecules are attracted to each other due to the opposite charges created by partial charge separations within the molecules.These attractions are called:

Accepted Answer

A)  peptide bonds.
B)  covalent bonds.
C)  ionic bonds.
D)  hydrogen bonds.
E)  double bonds.F) B) and E)
G) B) and C)

Question 9

Atoms containing a specific number of protons are called:

Accepted Answer

A)  minerals
B)  elements
C)  metals
D)  moleculesE) C) and D)
F) All of the above

Question 10

The number of protons in a given atom is equal to its:

Accepted Answer

A)  atomic number
B)  mass
C)  neutron number
D)  molecular numberE) A) and D)
F) None of the above

Question 11

When water ionizes,it produces equal amounts of hydrogen and hydroxide ions that can reassociate with each other.The pH of water is:

Accepted Answer

A)  3
B)  4
C)  5
D)  6
E)  7F) B) and D)
G) B) and C)

Question 12

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

Question 13

Proteins are three dimensional molecules made of strands of amino acids (imagine a ball of string) .There are 20 different amino acids used in proteins found in living organisms.Some of these amino acids are polar and others are nonpolar.Where would a series of nonpolar amino acids most likely be located in a protein that is found in the cytosol of an animal cell?

Accepted Answer

A)  On the surface of the protein
B)  In the interior of the protein
C)  At the very top of the protein
D)  At the very bottom of the proteinE) A) and D)
F) A) and C)

Question 14

One mole of a substance contains 6.02 x 1023 molecules.The atomic number of Li is 3 and the atomic mass is approximately 7.If you have three moles of Li,how many grams does it weigh?

Accepted Answer

A)  9
B)  21
C)  7 x 6.02 x 1023
D)  3 x 6.02 x 1023E) A) and C)
F) A) and B)

Question 15

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)  The surface tension created by hydrogen bonds is greater than the weight of the lizard initially.
C)  Polar molecules are attracted to ions and polar compounds,making these compounds soluble.
D)  Hydrogen bonds hold water molecules together; many hydrogen bonds must be broken for water to evaporate.E) None of the above
F) All of the above

Question 16

The negative logarithm of the hydrogen ion concentration in the solution is referred to as:

Accepted Answer

A)  pH
B)  atomic mass
C)  -OH concentration
D)  electronegativity
E)  specific heatF) A) and B)
G) B) and E)

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

Correct Answer
verified

When water ionizes,it produces equal amounts of hydrogen and hydroxide ions that can reassociate with each other.The pH of water is:

Correct Answer
verified

One mole of a substance contains 6.02 x 10²³ molecules.The atomic number of Li is 3 and the atomic mass is approximately 7.If you have three moles of Li,how many grams does it weigh?

Correct Answer
verified

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
verified

Atoms containing a specific number of protons are called:

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Sodium has 11 electrons arranged in three energy levels.In order to become stable,sodium forms an ion with:

Correct Answer
verified

Mendeleev found that when he arranged the known elements according to their atomic mass,the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements.This led to the generalization now known as:

Correct Answer
verified

The number of protons in a given atom is equal to its:

Correct Answer
verified

Water molecules are attracted to each other due to the opposite charges created by partial charge separations within the molecules.These attractions are called:

Correct Answer
verified

The carbonic acid and bicarbonate buffer in blood is extremely important to help maintain homeostasis.What would happen to the pH of the blood if bicarbonate were removed?

Correct Answer
verified

The negative logarithm of the hydrogen ion concentration in the solution is referred to as:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct AnswerverifiedShow Answer

When water ionizes,it produces equal amounts of hydrogen and hydroxide ions that can reassociate with each other.The pH of water is:

Correct AnswerverifiedShow Answer

One mole of a substance contains 6.02 x 1023 molecules.The atomic number of Li is 3 and the atomic mass is approximately 7.If you have three moles of Li,how many grams does it weigh?

Correct AnswerverifiedShow Answer

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

Atoms containing a specific number of protons are called:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Sodium has 11 electrons arranged in three energy levels.In order to become stable,sodium forms an ion with:

Correct AnswerverifiedShow Answer

Mendeleev found that when he arranged the known elements according to their atomic mass,the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements.This led to the generalization now known as:

Correct AnswerverifiedShow Answer

The number of protons in a given atom is equal to its:

Correct AnswerverifiedShow Answer

Water molecules are attracted to each other due to the opposite charges created by partial charge separations within the molecules.These attractions are called:

Correct AnswerverifiedShow Answer

The carbonic acid and bicarbonate buffer in blood is extremely important to help maintain homeostasis.What would happen to the pH of the blood if bicarbonate were removed?

Correct AnswerverifiedShow Answer

The negative logarithm of the hydrogen ion concentration in the solution is referred to as:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

One mole of a substance contains 6.02 x 10²³ molecules.The atomic number of Li is 3 and the atomic mass is approximately 7.If you have three moles of Li,how many grams does it weigh?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified