Covalent Bonds 4-3
a neutral group of atoms joined by covalent bonds
molecule
1. In an electron dot diagram, two pairs of
shared electrons represents a
A single bond
B double bond
C triple bond
D quadruple bond
double bond
6. Covalent bonds usually form when a nonmetal combines with a(n) ---metal.---
nonmetal
1. Why are alloys generally used to make
everyday objects?
A Alloys are often stronger and less reactive
than pure metals.
B Alloys have higher melting points than pure
metals.
C Alloys are less expensive to produce than
pure metals.
D Alloys have ionic bonds instead of metallic
bonds.
Alloys are often stronger and less reactive
than pure metals.
6. Metals typically have ----- melting points.
high
a bond in which four electrons are shared
double bond
2. A nitrogen molecule (N2) has one
triple bond. How many electrons do the
nitrogen atoms share?
A 1
B 3
C 4
D 6
6
7. A(n) ---ion--- is a neutral group of atoms joined by covalent bonds.
molecule
2. Metallic bonding is
A a type of covalent bond
B a type of ionic bond
C an attraction between positive and
negative ions
D an attraction between positive ions and
electrons
an attraction between positive ions and
electrons
7. The metal fins that cool a motorcycle’s engine make use of the high ----- conductivity of metals.
thermal
a bond in which electrons are shared equally
nonpolar bond
3. Compared to ionic compounds,
molecular compounds generally have
a good conductivity
b greater densities
C more chemical bonds
d a low boiling point
a low boiling point
8. If a molecule contains polar bonds, the molecule ---may or may not--- be polar overall.
true
3. Which of the following is NOT a
property of metals?
A ductile
B good electrical conductor
C good thermal insulator
D malleable
good thermal insulator
8. Metals are often used to make wire because they are ------.
ductile
a bond in which electrons are shared unequally
polar bond
4. Compared to ionic compounds,
molecular compounds generally have
a stronger chemical bonds
b poor conductivity
C a high melting point
d lower densities
poor conductivity
9. In a(n) ---polar--- bond, one atom pulls on the shared electrons more than the other atom.
true
4. At room temperature, most metals
are
A liquid
B solid
C gas
D an alloy
solid
9. Metals are used in electrical wires because they have high ------conductivity.
electrical
the chemical bond formed when two atoms share
electrons
covalent bond
5. The chemical bond formed when two atoms share electrons is called a(n) ---ionic--- bond.
covalent
10. The forces between molecules are much ---stronger--- than the forces between ions.
weaker
5. An attraction between a positive metal ion and surrounding electrons is --------a(n) bond.
metallic
10. Nonmetals are unlikely to form metallic bonds because their ----------are strongly held.
valence electrons