1.
A covalent bond is formed when
A) two atoms share a pair of valence electrons.
B) one atom shares two pairs of electrons.
C) electrons are transferred between atoms.
D) an atom loses an electron to another atom.
2.
Covalent bonds form through
A) the transfer of electrons.
B) the sharing of protons.
C) the sharing of electrons.
D) the transfer of protons.
3.
Which of the following is NOT always true of the formation of a covalent bond?
A) It occurs only between nonmetals.
B) It can occur between two atoms of the same element.
C) The electrons are shared equally among the atoms.
D) Multiple pairs of electrons can be shared.
4.
Atoms that share two pairs of electrons are called
A) single bonds.
B) double bonds.
C) triple bonds.
D) ionic bonds.
5.
In a polar covalent bond,
A) electrons are shared equally between atoms.
B) a cation is bonded to an anion.
C) electrons are transferred between atoms.
D) electrons are not shared equally between atoms.
6.
Atoms are held together by what attractions in a covalent bond?
A) attractions between shared electrons and protons
B) attractions between protons and neutrons
C) magnetic attractions between electrons and neutrons
D) magnetic attractions between protons and ions
7.
When atoms form a polar covalent bond, what happens to their charges?
A) the atom with the least attraction for electrons takes on a negative charge
B) the atom with the most attraction for electrons takes on a partial negative charge
C) the atom with the most attraction for electrons takes on a partial positive charge
D) the charges on the atoms in a polar covalent bond are both negative
8.
Attractions between nonpolar molecules are
A) stronger than attractions between polar molecules.
B) stronger than any other type of bonds.
C) weaker than attractions between polar molecules.
D) none of the above.
9.
Covalent bonds form by atoms sharing electrons while ionic bonds
A) are formed through electron transfer.
B) are also formed by atoms sharing electrons.
C) always form through double bonds.
D) are formed through the transfer of protons.
10.
Ionic bonds are usually made between metals and nonmetals, while covalent bonds
A) are usually made by two metals.
B) are usually formed by two nonmetals.
C) are usually not formed by two nonmetals.
D) are also formed between metals and nonmetals.
11.
Ionic compounds have __________ conductivity when dissolved and covalent compounds have __________ conductivity.
A) poor, poor
B) poor, good
C) good, good
D) good, poor
12.
Covalent compounds boil at
A) higher temperatures than ionic bonds.
B) lower temperatures than ionic bonds.
C) exactly 3,000° Celsius.
D) none of the above
13.
It is common for two metals to join together in a covalent bond.
A) True
B) False
14.
In a covalent bond, atoms are held together by attractions between the shared electrons and the protons in each nucleus.
A) True
B) False
15.
A double bond is formed when two atoms share four pairs of electrons.
A) True
B) False
16.
A triple bond is formed when three pairs of electrons are shared by three atoms.
A) True
B) False
17.
Attractions between nonpolar molecules are weaker than attractions between polar molecules.
A) True
B) False
18.
Electrons are NOT shared equally in a polar covalent bond.
A) True
B) False
19.
In a polar covalent bond, one atom can have a partial positive charge while the other atom has a partial negative charge.
A) True
B) False
20.
Ionic compounds are generally softer than covalent compounds.
A) True
B) False
21.
Ionic compounds conduct electricity when dissolved in water, but covalent compounds do not.
A) True
B) False
22.
The melting point of a covalent compound is usually higher than the melting point of an ionic compound.
A) True
B) False
23.
More energy is required to overcome attractions between covalent compounds than is required to overcome attractions between ionic compounds.
A) True
B) False
24.
Atoms form covalent bonds to achieve stable electron configuration.
A) True
B) False
25.
In a polar covalent bond, the atom with greater attraction for electrons has a partial positive charge.
A) True
B) False
A covalent bond is formed when
A) two atoms share a pair of valence electrons.
B) one atom shares two pairs of electrons.
C) electrons are transferred between atoms.
D) an atom loses an electron to another atom.
2.
Covalent bonds form through
A) the transfer of electrons.
B) the sharing of protons.
C) the sharing of electrons.
D) the transfer of protons.
3.
Which of the following is NOT always true of the formation of a covalent bond?
A) It occurs only between nonmetals.
B) It can occur between two atoms of the same element.
C) The electrons are shared equally among the atoms.
D) Multiple pairs of electrons can be shared.
4.
Atoms that share two pairs of electrons are called
A) single bonds.
B) double bonds.
C) triple bonds.
D) ionic bonds.
5.
In a polar covalent bond,
A) electrons are shared equally between atoms.
B) a cation is bonded to an anion.
C) electrons are transferred between atoms.
D) electrons are not shared equally between atoms.
6.
Atoms are held together by what attractions in a covalent bond?
A) attractions between shared electrons and protons
B) attractions between protons and neutrons
C) magnetic attractions between electrons and neutrons
D) magnetic attractions between protons and ions
7.
When atoms form a polar covalent bond, what happens to their charges?
A) the atom with the least attraction for electrons takes on a negative charge
B) the atom with the most attraction for electrons takes on a partial negative charge
C) the atom with the most attraction for electrons takes on a partial positive charge
D) the charges on the atoms in a polar covalent bond are both negative
8.
Attractions between nonpolar molecules are
A) stronger than attractions between polar molecules.
B) stronger than any other type of bonds.
C) weaker than attractions between polar molecules.
D) none of the above.
9.
Covalent bonds form by atoms sharing electrons while ionic bonds
A) are formed through electron transfer.
B) are also formed by atoms sharing electrons.
C) always form through double bonds.
D) are formed through the transfer of protons.
10.
Ionic bonds are usually made between metals and nonmetals, while covalent bonds
A) are usually made by two metals.
B) are usually formed by two nonmetals.
C) are usually not formed by two nonmetals.
D) are also formed between metals and nonmetals.
11.
Ionic compounds have __________ conductivity when dissolved and covalent compounds have __________ conductivity.
A) poor, poor
B) poor, good
C) good, good
D) good, poor
12.
Covalent compounds boil at
A) higher temperatures than ionic bonds.
B) lower temperatures than ionic bonds.
C) exactly 3,000° Celsius.
D) none of the above
13.
It is common for two metals to join together in a covalent bond.
A) True
B) False
14.
In a covalent bond, atoms are held together by attractions between the shared electrons and the protons in each nucleus.
A) True
B) False
15.
A double bond is formed when two atoms share four pairs of electrons.
A) True
B) False
16.
A triple bond is formed when three pairs of electrons are shared by three atoms.
A) True
B) False
17.
Attractions between nonpolar molecules are weaker than attractions between polar molecules.
A) True
B) False
18.
Electrons are NOT shared equally in a polar covalent bond.
A) True
B) False
19.
In a polar covalent bond, one atom can have a partial positive charge while the other atom has a partial negative charge.
A) True
B) False
20.
Ionic compounds are generally softer than covalent compounds.
A) True
B) False
21.
Ionic compounds conduct electricity when dissolved in water, but covalent compounds do not.
A) True
B) False
22.
The melting point of a covalent compound is usually higher than the melting point of an ionic compound.
A) True
B) False
23.
More energy is required to overcome attractions between covalent compounds than is required to overcome attractions between ionic compounds.
A) True
B) False
24.
Atoms form covalent bonds to achieve stable electron configuration.
A) True
B) False
25.
In a polar covalent bond, the atom with greater attraction for electrons has a partial positive charge.
A) True
B) False