Unit 3 Review Questions

Valence electrons are
1. unpaired electrons
2. inner-shell electrons
3. outer-shell electrons
4. electrons in the nucleus
How many valence electrons are in atom of sulfur (atomic #16) ?
1. one
2. two
3. three
4. four
5. five
6. six
7. seven
8. eight
How many valence electrons are in atom of radon (atomic #86) ?
1. one
2. two
3. three
4. four
5. five
6. six
7. seven
8. eight
How many valence electrons are in atom of cesium (atomic #55) ?
1. one
2. two
3. three
4. four
5. five
6. six
7. seven
8. eight
How many valence electrons are in atom of carbon (atomic #6) ?
1. one
2. two
3. three
4. four
5. five
6. six
7. seven
8. eight
How many valence electrons are in atom of aluminum (atomic #13) ?
1. one
2. two
3. three
4. four
5. five
6. six
7. seven
8. eight
How many valence electrons are in atom of arsenic (atomic #33) ?
1. one
2. two
3. three
4. four
5. five
6. six
7. seven
8. eight
How many valence electrons are in atom of iodine (atomic #53) ?
1. one
2. two
3. three
4. four
5. five
6. six
7. seven
8. eight
How many electrons will a calcium atom (Ca) lose in order to get a noble gas configuration?
1. one
2. two
3. three
4. four
How many electrons will a phosphorus atom (P) gain in order to get a noble gas configuration?
1. one
2. two
3. three
4. four
What is the formula for the ion formed when strontium (atomic number 38) loses its valence electrons?
1. Sr²⁺
2. Sr^2-
3. Sr⁺
4. Sr^-
What is the formula for the ion formed when oxygen (atomic number 8) obtains a noble gas configuration?
1. O²⁺
2. O^2-
3. O^3-
4. O⁺
Which of the following if the correct compound formula for barium sulfide?
1. BaS
2. Ba₂S
3. BaS₂
4. Ba₃S₂
Which of the following if the correct compound formula for iron(II) phosphide?
1. Fe₂P₃
2. Fe₃P₂
3. FeP
4. Fe₂P
Which of the following if the correct compound formula for lithium fluoride?
1. LiF
2. Li₂F
3. LiF₂
4. LiF₃
Which of the following if the correct compound formula for aluminum chloride?
1. AlCl₂
2. AlCl₃
3. Al₂Cl₃
4. AlCl
Which of the following is the correct compound formula for sodium oxide?
1. NaO
2. Na₂O
3. NaO₂
4. Na₂O₃
Chemical bonds may be produced by any of the following processes involving electrons EXCEPT:
1. losing electrons
2. gaining electrons
3. splitting electrons
4. sharing electrons
In ionic bonds, valence electrons are:
1. transferred
2. equally shared
3. unequally shared
4. destroyed
In metallic bonding, the valence electrons of all atoms are shared in:
1. a polar covalent bond
2. a nonpolar covalent bond
3. an electron sea
4. transferred to nonmetallic ions
Bonds between atoms of metals are generally:
1. Ionic
2. Covalent
3. Metallic
Bonds between nonmetals and other nonmetals are generally:
1. Ionic
2. Covalent
3. Metallic
Bonds between metals and nonmetals are generally:
1. Ionic
2. Covalent
3. Metallic
A bond between nitrogen (atomic #7) and oxygen (atomic #8) would be:
1. ionic
2. covalent
3. metallic
The bond between boron (atomic #5) and silicon (atomic #14) is:
1. ionic
2. covalent
3. metallic
The bond in between sodium (atomic #11) and oxygen (atomic #8) is:
1. ionic
2. covalent
3. metallic
The bond between hydrogen (atomic #1) and oxygen (atomic #8) is:
1. ionic
2. covalent
3. metallic
The bond between lithium (atomic #3) and fluorine (atomic #9) is:
1. ionic
2. covalent
3. metallic
A bond between potassium (atomic #19) and chlorine (atomic #17) would be:
1. ionic
2. covalent
3. metallic
The bond in between an oxygen atom and another oxygen atom is:
1. ionic
2. covalent
3. metallic
The bond existing between the atoms of iron (atomic #26) in a piece of iron is:
1. ionic
2. covalent
3. metallic
The correct electron-dot notation for the element indium (atomic #49) is:
Which of the following IS NOT a covalent compound?
1. CaO
2. CO₂
3. CH₃Cl
4. NH₃
Which of the following IS NOT an ionic compound?
1. KCl
2. MnO₂
3. Mg₃N₂
4. C₂H₅OH
The octet rule explains the stability of most covalently bonded molecules in terms of:
1. electronegativity differences
2. noble-gas configurations
3. ionization energies
4. electron affinities
According to the HONC rule, how many covalent bonds form around hydrogen and the halogens?
1. one
2. two
3. three
4. four
According to the HONC rule, how many covalent bonds form around nitrogen?
1. one
2. two
3. three
4. four
Which of the following is an acceptable Lewis Structure for the diatomic nitrogen molecule?
Which of the following elements has the same Lewis dot structure as phosphorus?
1. nitrogen
2. sulfur
3. silicon
4. argon
In the correct Lewis structure for the methane (CH₄) molecule, how many unshared electron pairs surround the carbon?
1. 0
2. 2
3. 4
4. 8
In the correct Lewis structure for water, how many unshared pairs of electrons will oxygen have?
1. 1
2. 2
3. 3
4. 4
Which of the following is an acceptable Lewis structure for chloromethane (CH₃Cl)?
Which of the diatomic elements has a double bond between its atoms?
1. hydrogen
2. nitrogen
3. oxygen
4. fluorine
Most ionic compounds form
1. liquids
2. molecules
3. crystals
4. gases
Proteins are polymers of
1. nucleic acids
2. sugars
3. nucleotides
4. amino acids
Which of the following pairs is incorrect?
1. monomer = simple sugar | polymer = starch
2. monomer = protein | polymer = amino acid
3. monomer = nucleotide | polymer = nucleic acid
4. monomer = link | polymer = chain
Which of the following substances is not an example of a polymer?
1. Starch
2. Nucleic acid
3. Plastic
4. Salt
The bonding in many polymers is made possible by the bonding properties of what element?
1. hydrogen
2. oxygen
3. nitrogen
4. carbon
The structure shown above is an example of
1. a salt
2. a polymer
3. a monomer
4. a metal
The image above shows the relationship between
1. a monomer (top) and a polymer (bottom)
2. a polymer (top) and a monomer (bottom)
3. an ion (bottom) and a salt crystal (top)
4. a sugar (top) and an amino acid (bottom)

Unit 3 Review Questions

Multiple-choice exercise