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) A) and B)

Question 2

Carbon has 4 valence electrons and oxygen has 6.Carbon dioxide would contain _____.

Accepted Answer

A)  four hydrogen bonds
B)  two single covalent bonds
C)  two double covalent bonds
D)  one single covalent bondE) A) and B)
F) A) and C)

Question 3

You recently discovered a new element, and find that this particular element has one electron its outer energy level.What would you expect will happen to an atom of this element if placed in water?

Accepted Answer

A)  It will gain an electron forming a positive ion.
B)  It will lose an electron forming a negative ion.
C)  It will lose an electron forming a positive ion.
D)  It will gain an electron forming a negative ion.E) A) and D)
F) B) and C)

Question 4

Carbon-12, Carbon-13 and Carbon-14 are examples of:

Accepted Answer

A)  ions
B)  isomers
C)  molecules
D)  isotopesE) A) and C)
F) None of the above

Question 5

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) B) and C)
F) A) and C) B

Question 6

Isotopes that are unstable and decay when their nucleus breaks up into elements with lower atomic numbers, emitting significant amounts of energy in the process, are called:

Accepted Answer

A)  energetic
B)  ionic
C)  radioactive
D)  isometricE) B) and C)
F) A) and D)

Question 7

Oxygen has an atomic mass of 16 and an atomic number of 8.How many neutrons are present?

Accepted Answer

A)  8
B)  16
C)  4
D)  24E) All of the above
F) A) and B)

Question 8

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) B) and D)
F) A) and C)

Question 9

Organisms are composed of molecules, which are collections of smaller units, termed:

Accepted Answer

A)  monomers.
B)  atoms.
C)  electrons.
D)  polymers.E) A) and B)
F) None of the above

Question 10

A scientist conducts a procedure that causes nitrogen atoms to gain neutrons.The resulting atoms will be:

Accepted Answer

A)  ions of nitrogen.
B)  positively charged.
C)  negatively charged.
D)  isotopes of nitrogen.E) B) and C)
F) A) and D)

Question 11

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 raises the freezing point of water.
C)  Ethylene glycol has a lower heat capacity than water.
D)  Ethylene glycol has a higher heat capacity than water.E) A) and B)
F) A) and C)

Question 12

Magnesium chloride is a salt formed with ionic bonds between one magnesium ion and two chloride ions.Magnesium has two electrons in its outer shell and chlorine has seven electrons in its outer shell.How are the electrons transferred between these atoms?

Accepted Answer

A)  Both magnesium and chlorine are reduced.
B)  Magnesium is oxidized and chlorine is reduced.
C)  Chlorine is oxidized and magnesium is reduced.
D)  Both magnesium and chlorine are oxidized.E) C) and D)
F) All of the above

Question 13

The electronegativity of nitrogen (N)  is 3.0, while the electronegativity of hydrogen (H)  is 2.1.Knowing this, consider how the electrons will be shared in ammonia (NH3) .What do you predict about the polarity of ammonia?

Accepted Answer

A)  Each H atom has a partial positive charge
B)  The N atom has a partial positive charge
C)  Each H atom has a partial negative charge
D)  The N atom has a strong positive chargeE) B) and D)
F) C) and D)

Question 14

In the crystal matrix of ordinary salt, the sodium and chlorine are held together by:

Accepted Answer

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

Question 15

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) B) and C)
F) A) and D)

Question 16

Two oxygen atoms joined to each other by the sharing of two pairs of electrons form a(n) :

Accepted Answer

A)  double covalent bond.
B)  single bond.
C)  hydrogen bond.
D)  ionic bond.E) None of the above
F) B) and D) A

Question 17

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 non-polar.Where would a series of non-polar 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) B) and D)
F) A) and B) B

Question 18

Regardless of its shape, a given orbital may contain no more than:

Accepted Answer

A)  1 electron.
B)  4 electrons.
C)  8 electrons.
D)  2 electrons.E) B) and C)
F) None of the above

Question 19

Sue was monitoring the oil spill into the Gulf of Mexico from an oil tanker.From her observations, she noted that the oil was moving as large patches in the water.It did not appear as though the oil was dissolving into the water.Why did the oil not dissolve into the water?

Accepted Answer

A)  Hydrophobic interactions
B)  Surface tension
C)  Sea water acts as a solvent
D)  Water forms hydration shellsE) A) and C)
F) C) and D)

Question 20

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)  1s22s23p64s25p6
B)  1s22s83p8
C)  1s22s22p63s23p6
D)  1s22s62p23s63p2E) B) and C)
F) A) and C)

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

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
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Carbon has 4 valence electrons and oxygen has 6.Carbon dioxide would contain _____.

Correct Answer
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You recently discovered a new element, and find that this particular element has one electron its outer energy level.What would you expect will happen to an atom of this element if placed in water?

Correct Answer
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Carbon-12, Carbon-13 and Carbon-14 are examples of:

Correct Answer
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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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B

Isotopes that are unstable and decay when their nucleus breaks up into elements with lower atomic numbers, emitting significant amounts of energy in the process, are called:

Correct Answer
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Oxygen has an atomic mass of 16 and an atomic number of 8.How many neutrons are present?

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

Correct Answer
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Organisms are composed of molecules, which are collections of smaller units, termed:

Correct Answer
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A scientist conducts a procedure that causes nitrogen atoms to gain neutrons.The resulting atoms will be:

Correct Answer
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Correct Answer
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Magnesium chloride is a salt formed with ionic bonds between one magnesium ion and two chloride ions.Magnesium has two electrons in its outer shell and chlorine has seven electrons in its outer shell.How are the electrons transferred between these atoms?

Correct Answer
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The electronegativity of nitrogen (N) is 3.0, while the electronegativity of hydrogen (H) is 2.1.Knowing this, consider how the electrons will be shared in ammonia (NH₃) .What do you predict about the polarity of ammonia?

Correct Answer
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In the crystal matrix of ordinary salt, the sodium and chlorine are held together by:

Correct Answer
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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
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Two oxygen atoms joined to each other by the sharing of two pairs of electrons form a(n) :

Correct Answer
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A

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B

Regardless of its shape, a given orbital may contain no more than:

Correct Answer
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Sue was monitoring the oil spill into the Gulf of Mexico from an oil tanker.From her observations, she noted that the oil was moving as large patches in the water.It did not appear as though the oil was dissolving into the water.Why did the oil not dissolve into the water?

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

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

Carbon has 4 valence electrons and oxygen has 6.Carbon dioxide would contain _____.

Correct AnswerverifiedShow Answer

You recently discovered a new element, and find that this particular element has one electron its outer energy level.What would you expect will happen to an atom of this element if placed in water?

Correct AnswerverifiedShow Answer

Carbon-12, Carbon-13 and Carbon-14 are examples of:

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 AnswerverifiedB

Isotopes that are unstable and decay when their nucleus breaks up into elements with lower atomic numbers, emitting significant amounts of energy in the process, are called:

Correct AnswerverifiedShow Answer

Oxygen has an atomic mass of 16 and an atomic number of 8.How many neutrons are present?

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

Organisms are composed of molecules, which are collections of smaller units, termed:

Correct AnswerverifiedShow Answer

A scientist conducts a procedure that causes nitrogen atoms to gain neutrons.The resulting atoms will be:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Magnesium chloride is a salt formed with ionic bonds between one magnesium ion and two chloride ions.Magnesium has two electrons in its outer shell and chlorine has seven electrons in its outer shell.How are the electrons transferred between these atoms?

Correct AnswerverifiedShow Answer

The electronegativity of nitrogen (N) is 3.0, while the electronegativity of hydrogen (H) is 2.1.Knowing this, consider how the electrons will be shared in ammonia (NH3) .What do you predict about the polarity of ammonia?

Correct AnswerverifiedShow Answer

In the crystal matrix of ordinary salt, the sodium and chlorine are held together by:

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

Two oxygen atoms joined to each other by the sharing of two pairs of electrons form a(n) :

Correct AnswerverifiedA

Correct AnswerverifiedB

Regardless of its shape, a given orbital may contain no more than:

Correct AnswerverifiedShow Answer

Sue was monitoring the oil spill into the Gulf of Mexico from an oil tanker.From her observations, she noted that the oil was moving as large patches in the water.It did not appear as though the oil was dissolving into the water.Why did the oil not dissolve into the water?

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

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B

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The electronegativity of nitrogen (N) is 3.0, while the electronegativity of hydrogen (H) is 2.1.Knowing this, consider how the electrons will be shared in ammonia (NH₃) .What do you predict about the polarity of ammonia?

Correct Answer
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Correct Answer
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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
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Correct Answer
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A

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B

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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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