Question 1

Which of the following molecules contains a polar covalent bond?

Accepted Answer

A) H-F 
B) Cl-Cl 
C) H-H 
D) F-F 
E) all of the above 
A) H-F 
B) Cl-Cl 
C) H-H 
D) F-F 
E) all of the above

Question 2

How many covalent bonds would the following atom usually form?

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 6 
E) It would tend to form ionic bonds. 
A) 1 
B) 2 
C) 4 
D) 6 
E) It would tend to form ionic bonds.

Question 3

Which are closer together: the two nuclei within potassium fluoride, KF, or the two nuclei within molecular fluorine,   ?

Accepted Answer

A) KF 
B)    
C) Both are the same. Any atom bonded to F will have the same inter-nuclear separation. 
D) It makes little sense to compare two molecules which exist in different physical states. KF is a solid while   is a gas. 
A) KF 
B)    
C) Both are the same. Any atom bonded to F will have the same inter-nuclear separation. 
D) It makes little sense to compare two molecules which exist in different physical states. KF is a solid while   is a gas.

Question 4

How many chloride ions (Cl1-)are needed to balance the positive charge of a barium ion (Ba2+)?

Accepted Answer

A) 2 
B) 1 
C) 3 
D) 0 
A) 2 
B) 1 
C) 3 
D) 0

Question 5

There is more gold in 1 km3 of the ocean than the amount of gold mined in all of recorded history. How come we do not mine the oceans?

Accepted Answer

A) It is too dilute to separate. 
B) It would take too much energy. 
C) It would cost too much. 
D) all of the above 
E) none of the above 
A) It is too dilute to separate. 
B) It would take too much energy. 
C) It would cost too much. 
D) all of the above 
E) none of the above

Question 6

What would be the shape of a molecule where the central atom has two nonbonding pairs while also covalently bonded to two other atoms?

Accepted Answer

A) pyramidal 
B) bent 
C) tetrahedral 
D) linear 
E) T-shaped 
A) pyramidal 
B) bent 
C) tetrahedral 
D) linear 
E) T-shaped

Question 7

What does the line in the following example actually represent? H-H

Accepted Answer

A) a shared pair of electrons 
B) a covalent bond 
C) an ionic bond 
D) a pair of nonbonding electrons 
E) A and B 
A) a shared pair of electrons 
B) a covalent bond 
C) an ionic bond 
D) a pair of nonbonding electrons 
E) A and B

Question 8

How many electrons are used to draw the electron-dot structure for calcium chloride, an ionic compound with the formula

Accepted Answer

A) 4 
B) 6 
C) 8 
D) 16 
A) 4 
B) 6 
C) 8 
D) 16

Question 9

True or False: The more shells in an atom, the lower its electronegativity. Explain.

Accepted Answer

A) Always true; the greater the number of shells in an atom, the lower the electronegativity. 
B) Always false; the greater the number of shells in an atom, the higher the electronegativity. 
C) Sometimes true and sometimes false; This holds true only within any one atomic group (vertical column). 
D) Sometimes true and sometimes false; This holds true only across any given period (row)of the periodic table. 
A) Always true; the greater the number of shells in an atom, the lower the electronegativity. 
B) Always false; the greater the number of shells in an atom, the higher the electronegativity. 
C) Sometimes true and sometimes false; This holds true only within any one atomic group (vertical column). 
D) Sometimes true and sometimes false; This holds true only across any given period (row)of the periodic table.

Question 10

Which of the following elements will most likely form an ion with a +2 charge?

Accepted Answer

A) Na 
B) Mg 
C) Ne 
D) Si 
E) Cl 
A) Na 
B) Mg 
C) Ne 
D) Si 
E) Cl

Question 11

Which would you expect to have a higher melting point: sodium chloride, NaCl, or cesium chloride, CsCl? Why?

Accepted Answer

A) The cesium chloride has a higher melting point because larger ions of the same charge are able to attract more ions of the opposite charge. 
B) The cesium chloride has a higher melting point because its ions are smaller, which makes the charges more dense. 
C) The sodium chloride has a higher melting point because of the greater charges of the ions, and hence the greater force of attractions between them. 
D) The sodium chloride has a higher melting point because its ions are smaller, which allows oppositely charged ions to get closer. 
A) The cesium chloride has a higher melting point because larger ions of the same charge are able to attract more ions of the opposite charge. 
B) The cesium chloride has a higher melting point because its ions are smaller, which makes the charges more dense. 
C) The sodium chloride has a higher melting point because of the greater charges of the ions, and hence the greater force of attractions between them. 
D) The sodium chloride has a higher melting point because its ions are smaller, which allows oppositely charged ions to get closer.

Question 12

Phosphine is a covalent compound that contains phosphorus, P, and hydrogen, H. What is its chemical formula?

Accepted Answer

A) PH 
B)    P 
C) P   
D)      
A) PH 
B)    P 
C) P   
D)

Question 13

An atom loses an electron to another atom. Is this an example of a physical or chemical change?

Accepted Answer

A) physical change involving the formation of negative ions 
B) chemical change involving the formation of neutral atoms 
C) physical change involving the formation of positive ions 
D) chemical change involving the formation of ions 
A) physical change involving the formation of negative ions 
B) chemical change involving the formation of neutral atoms 
C) physical change involving the formation of positive ions 
D) chemical change involving the formation of ions

Question 14

Which of the following would be a negative ion with a single charge?

Accepted Answer

A) an atom with 11 protons and 12 electrons 
B) an atom with 11 protons and 11 electrons 
C) an atom with 12 protons and 11 electrons 
D) an atom with 10 protons and 12 electrons 
E) none of the above 
A) an atom with 11 protons and 12 electrons 
B) an atom with 11 protons and 11 electrons 
C) an atom with 12 protons and 11 electrons 
D) an atom with 10 protons and 12 electrons 
E) none of the above

Question 15

Which would you expect to have a higher melting point: sodium chloride, NaCl, or aluminum oxide,   ?

Accepted Answer

A) The aluminum oxide has a higher melting point because it is a larger molecule and has a greater number of molecular interactions. 
B) NaCl has a higher melting point because it is a solid at room temperature. 
C) The aluminum oxide has a higher melting point because of the greater charges of the ions, and hence the greater force of attractions between them. 
D) The aluminum oxide has a higher melting point because of the covalent bonds within the molecule. 
A) The aluminum oxide has a higher melting point because it is a larger molecule and has a greater number of molecular interactions. 
B) NaCl has a higher melting point because it is a solid at room temperature. 
C) The aluminum oxide has a higher melting point because of the greater charges of the ions, and hence the greater force of attractions between them. 
D) The aluminum oxide has a higher melting point because of the covalent bonds within the molecule.

Question 16

What is the compound that forms if you react potassium and sulfur?

Accepted Answer

A) K2S 
B) KS 
C) SP 
D) PS2 
E) SkP 
A) K2S 
B) KS 
C) SP 
D) PS2 
E) SkP

Question 17

Which of the following molecules should have the same molecular shape and approximate bond angles as ammonia,   ?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 18

Which of the following best describes ionic bonding?

Accepted Answer

A) two atoms sharing a set of electrons 
B) two atoms exchanging a set of electrons 
C) one atom giving up some of its electrons to another atom 
D) when two elements with same charge are held together by electrostatic forces 
E) none of the above 
A) two atoms sharing a set of electrons 
B) two atoms exchanging a set of electrons 
C) one atom giving up some of its electrons to another atom 
D) when two elements with same charge are held together by electrostatic forces 
E) none of the above

Question 19

Which of the following describes the reason for the following application of metals? the fenders of a car

Accepted Answer

A) do not conduct heat well 
B) are shiny 
C) conduct electricity 
D) are strong but can be bent 
E) c and d 
A) do not conduct heat well 
B) are shiny 
C) conduct electricity 
D) are strong but can be bent 
E) c and d

Question 20

The number of nonbonding pairs in the ammonia molecule is ________.

Accepted Answer

A) one 
B) two 
C) three 
D) four 
A) one 
B) two 
C) three 
D) four

Which of the following molecules contains a polar covalent bond?

How many covalent bonds would the following atom usually form?

Which are closer together: the two nuclei within potassium fluoride, KF, or the two nuclei within molecular fluorine, ?

How many chloride ions (Cl^1-)are needed to balance the positive charge of a barium ion (Ba²⁺)?

There is more gold in 1 km³ of the ocean than the amount of gold mined in all of recorded history. How come we do not mine the oceans?

What would be the shape of a molecule where the central atom has two nonbonding pairs while also covalently bonded to two other atoms?

What does the line in the following example actually represent? H-H

How many electrons are used to draw the electron-dot structure for calcium chloride, an ionic compound with the formula

True or False: The more shells in an atom, the lower its electronegativity. Explain.

Which of the following elements will most likely form an ion with a +2 charge?

Which would you expect to have a higher melting point: sodium chloride, NaCl, or cesium chloride, CsCl? Why?

Phosphine is a covalent compound that contains phosphorus, P, and hydrogen, H. What is its chemical formula?

An atom loses an electron to another atom. Is this an example of a physical or chemical change?

Which of the following would be a negative ion with a single charge?

Which would you expect to have a higher melting point: sodium chloride, NaCl, or aluminum oxide, ?

What is the compound that forms if you react potassium and sulfur?

Which of the following molecules should have the same molecular shape and approximate bond angles as ammonia, ?

Which of the following best describes ionic bonding?

Which of the following describes the reason for the following application of metals? the fenders of a car

The number of nonbonding pairs in the ammonia molecule is ________.

About Science

Particles of Matter

Elements of Chemistry

Subatomic Particles

The Atomic Nucleus

How Molecules Mix

How Water Behaves

How Chemicals React

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

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Exam 6: How Atoms Bond

Which of the following molecules contains a polar covalent bond?

How many covalent bonds would the following atom usually form?

Which are closer together: the two nuclei within potassium fluoride, KF, or the two nuclei within molecular fluorine, ?

How many chloride ions (Cl1-)are needed to balance the positive charge of a barium ion (Ba2+)?

There is more gold in 1 km3 of the ocean than the amount of gold mined in all of recorded history. How come we do not mine the oceans?

What would be the shape of a molecule where the central atom has two nonbonding pairs while also covalently bonded to two other atoms?

What does the line in the following example actually represent? H-H

How many electrons are used to draw the electron-dot structure for calcium chloride, an ionic compound with the formula

True or False: The more shells in an atom, the lower its electronegativity. Explain.

Which of the following elements will most likely form an ion with a +2 charge?

Which would you expect to have a higher melting point: sodium chloride, NaCl, or cesium chloride, CsCl? Why?

Phosphine is a covalent compound that contains phosphorus, P, and hydrogen, H. What is its chemical formula?

An atom loses an electron to another atom. Is this an example of a physical or chemical change?

Which of the following would be a negative ion with a single charge?

Which would you expect to have a higher melting point: sodium chloride, NaCl, or aluminum oxide, ?

What is the compound that forms if you react potassium and sulfur?

Which of the following molecules should have the same molecular shape and approximate bond angles as ammonia, ?

Which of the following best describes ionic bonding?

Which of the following describes the reason for the following application of metals? the fenders of a car

The number of nonbonding pairs in the ammonia molecule is ________.

About Science

Particles of Matter

Elements of Chemistry

Subatomic Particles

The Atomic Nucleus

How Molecules Mix

How Water Behaves

How Chemicals React

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

Optimizing Food Production

Protection Water and Air Resources

Capturing Energy

Filters

How many chloride ions (Cl^1-)are needed to balance the positive charge of a barium ion (Ba²⁺)?

There is more gold in 1 km³ of the ocean than the amount of gold mined in all of recorded history. How come we do not mine the oceans?