Question 1

Which should be larger, the potassium atom, K, or the potassium ion, K⁺?

Accepted Answer

A) The potassium ion, K⁺ is larger since charging an atom always makes it larger. 
B) The potassium atom, K, with an additional shell of electrons is larger. 
C) The potassium ion, K⁺ is larger since it has an extra electron which increases its size. 
D) The potassium atom and the potassium ion are exactly the same size and only differ in charge. 
A) The potassium ion, K⁺ is larger since charging an atom always makes it larger. 
B) The potassium atom, K, with an additional shell of electrons is larger. 
C) The potassium ion, K⁺ is larger since it has an extra electron which increases its size. 
D) The potassium atom and the potassium ion are exactly the same size and only differ in charge.

Question 2

Magnesium ions carry a 2+ charge, and chloride ions carry a 1- charge. What is the chemical formula for the ionic compound magnesium chloride?

Accepted Answer

A) MgCl 
B)    Cl 
C) Mg   
D)      
A) MgCl 
B)    Cl 
C) Mg   
D)

Question 3

Which of the following molecules is the most polar?

Accepted Answer

A) HCl 
B) BrF 
C) CO 
D)    
A) HCl 
B) BrF 
C) CO 
D)

Question 4

Which of the following describes the reason for the following application of metals? long wires acting to carry power

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 5

Barium ions carry a 2+ charge, and nitrogen ions carry a 3-charge. What would be the chemical formula for the ionic compound barium nitride?

Accepted Answer

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

Question 6

Water,   O, and methane, C   , have about the same mass and differ by only one type of atom. Why is the boiling point of water so much higher than that of methane?

Accepted Answer

A) The water molecule is less symmetrical than is the methane molecule. 
B) The oxygen of a water molecule has two lone pairs of electrons. 
C) The electronegativity difference between oxygen and hydrogen is greater than the electronegativity difference between carbon and hydrogen. 
D) all of the above 
A) The water molecule is less symmetrical than is the methane molecule. 
B) The oxygen of a water molecule has two lone pairs of electrons. 
C) The electronegativity difference between oxygen and hydrogen is greater than the electronegativity difference between carbon and hydrogen. 
D) all of the above

Question 7

Which of the following molecules is polar?

Accepted Answer

A) a 
B) b 
C) c 
D) All are polar. 
E) Only A and C are polar. 
A) a 
B) b 
C) c 
D) All are polar. 
E) Only A and C are polar.

Question 8

What property of alloys make them ideal for developing new materials?

Accepted Answer

A) The characteristics of the material change depending on how much of each component is present. 
B) Alloys are very rigid and are extremely resistant to chemical decomposition. 
C) The size of the atoms involved is directly related the electrical conductivity. 
D) all of the above 
E) none of the above 
A) The characteristics of the material change depending on how much of each component is present. 
B) Alloys are very rigid and are extremely resistant to chemical decomposition. 
C) The size of the atoms involved is directly related the electrical conductivity. 
D) all of the above 
E) none of the above

Question 9

How many valence electrons does bromine (Br, atomic no. = 35)have?

Accepted Answer

A) 1 
B) 7 
C) 21 
D) 28 
E) 35 
A) 1 
B) 7 
C) 21 
D) 28 
E) 35

Question 10

What is the name for the following polyatomic ion? PO43-

Accepted Answer

A) phosphate 
B) phosphorus oxide 
C) phosphinate 
D) trioxo phosphoride 
E) potassium 
A) phosphate 
B) phosphorus oxide 
C) phosphinate 
D) trioxo phosphoride 
E) potassium

Question 11

An individual carbon-oxygen bond is polar. Yet carbon dioxide, C   , which has two carbon-oxygen bonds, is nonpolar because ________.

Accepted Answer

A) the molecule has an even number of electrons 
B) it has a greater symmetry 
C) the electron-pulls of the two oxygen atoms are equal and opposite 
D) Two of the above are reasonable 
A) the molecule has an even number of electrons 
B) it has a greater symmetry 
C) the electron-pulls of the two oxygen atoms are equal and opposite 
D) Two of the above are reasonable

Question 12

List the following bonds in order of increasing polarity:

Accepted Answer

A) N-O < N-N < N-F < H-F 
B) N-N < N-O < N-F < H-F 
C) H-F < N-F < N-O < N-N 
D) N-N < N-O < H-F < N-F 
A) N-O < N-N < N-F < H-F 
B) N-N < N-O < N-F < H-F 
C) H-F < N-F < N-O < N-N 
D) N-N < N-O < H-F < N-F

Question 13

If the following generic atom were to undergo ionization, what would be the charge of most likely product?

Accepted Answer

A) +3 
B) -3 
C) -5 
D) 8 
E) would probably not ionize 
A) +3 
B) -3 
C) -5 
D) 8 
E) would probably not ionize

Question 14

How many substituents are on the following carbon atom?

Accepted Answer

A) 1 
B) 2 
C) 2 H2 
D) 4 
E) none of the above 
A) 1 
B) 2 
C) 2 H2 
D) 4 
E) none of the above

Question 15

Which of the following molecules would contain a dipole?

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 16

Why is metal shiny?

Accepted Answer

A) The loose electrons reflect most wavelengths of light. 
B) The electrons transmit most wavelengths of light. 
C) The electrons absorb each light wave. 
D) The electrons emit light due to electronic excitation. 
E) all of the above 
A) The loose electrons reflect most wavelengths of light. 
B) The electrons transmit most wavelengths of light. 
C) The electrons absorb each light wave. 
D) The electrons emit light due to electronic excitation. 
E) all of the above

Question 17

How many covalent bonds would the following atom usually form?

Accepted Answer

A) 3 
B) 2 
C) 1 
D) 5 
E) would usually not form any covalent bonds 
A) 3 
B) 2 
C) 1 
D) 5 
E) would usually not form any covalent bonds

Question 18

Given that the total number of atoms on our planet remains fairly constant, how is it ever possible to deplete a natural resource such as a metal?

Accepted Answer

A) The problem remains that not everyone recycles as they should. 
B) Recycling only forestalls the inevitable depletion of metal resources. 
C) The atoms don't leave our planet, which is why naturally occurring materials never really reach the point of depletion. 
D) The problem is with the expense of collecting metal atoms that are uniformly dispersed. 
A) The problem remains that not everyone recycles as they should. 
B) Recycling only forestalls the inevitable depletion of metal resources. 
C) The atoms don't leave our planet, which is why naturally occurring materials never really reach the point of depletion. 
D) The problem is with the expense of collecting metal atoms that are uniformly dispersed.

Question 19

Which of the following is an ion?

Accepted Answer

A) 2 H2 
B) Br2 
C) HCl 
D) Au + 3 Br2 
E) none of the above 
A) 2 H2 
B) Br2 
C) HCl 
D) Au + 3 Br2 
E) none of the above

Question 20

Why is it so easy for a magnesium atom to lose two electrons?

Accepted Answer

A) The nuclear charge of the magnesium atoms is relatively weak. 
B) These two electrons are found relatively far from the nucleus. 
C) These two electrons are well shielded from the nuclear charge. 
D) There are lots of electron-electron repulsions that go on within the valence shell. 
A) The nuclear charge of the magnesium atoms is relatively weak. 
B) These two electrons are found relatively far from the nucleus. 
C) These two electrons are well shielded from the nuclear charge. 
D) There are lots of electron-electron repulsions that go on within the valence shell.

Which should be larger, the potassium atom, K, or the potassium ion, K⁺?

Magnesium ions carry a 2+ charge, and chloride ions carry a 1- charge. What is the chemical formula for the ionic compound magnesium chloride?

Which of the following molecules is the most polar?

Which of the following describes the reason for the following application of metals? long wires acting to carry power

Barium ions carry a 2+ charge, and nitrogen ions carry a 3-charge. What would be the chemical formula for the ionic compound barium nitride?

Water, O, and methane, C , have about the same mass and differ by only one type of atom. Why is the boiling point of water so much higher than that of methane?

Which of the following molecules is polar?

What property of alloys make them ideal for developing new materials?

How many valence electrons does bromine (Br, atomic no. = 35)have?

What is the name for the following polyatomic ion? PO₄^3-

An individual carbon-oxygen bond is polar. Yet carbon dioxide, C , which has two carbon-oxygen bonds, is nonpolar because ________.

List the following bonds in order of increasing polarity:

If the following generic atom were to undergo ionization, what would be the charge of most likely product?

How many substituents are on the following carbon atom?

Which of the following molecules would contain a dipole?

Why is metal shiny?

How many covalent bonds would the following atom usually form?

Given that the total number of atoms on our planet remains fairly constant, how is it ever possible to deplete a natural resource such as a metal?

Which of the following is an ion?

Why is it so easy for a magnesium atom to lose two electrons?

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

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Exam 6: How Atoms Bond

Which should be larger, the potassium atom, K, or the potassium ion, K⁺?

Magnesium ions carry a 2+ charge, and chloride ions carry a 1- charge. What is the chemical formula for the ionic compound magnesium chloride?

Which of the following molecules is the most polar?

Which of the following describes the reason for the following application of metals? long wires acting to carry power

Barium ions carry a 2+ charge, and nitrogen ions carry a 3-charge. What would be the chemical formula for the ionic compound barium nitride?

Water, O, and methane, C , have about the same mass and differ by only one type of atom. Why is the boiling point of water so much higher than that of methane?

Which of the following molecules is polar?

What property of alloys make them ideal for developing new materials?

How many valence electrons does bromine (Br, atomic no. = 35)have?

What is the name for the following polyatomic ion? PO43-

An individual carbon-oxygen bond is polar. Yet carbon dioxide, C , which has two carbon-oxygen bonds, is nonpolar because ________.

List the following bonds in order of increasing polarity:

If the following generic atom were to undergo ionization, what would be the charge of most likely product?

How many substituents are on the following carbon atom?

Which of the following molecules would contain a dipole?

Why is metal shiny?

How many covalent bonds would the following atom usually form?

Given that the total number of atoms on our planet remains fairly constant, how is it ever possible to deplete a natural resource such as a metal?

Which of the following is an ion?

Why is it so easy for a magnesium atom to lose two electrons?

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

What is the name for the following polyatomic ion? PO₄^3-