1.
A substance composed of two or more elements combined chemically in a fixed proportion by mass is
A.
a compound
B.
a mixture
C.
an atom
D.
a solid
E.
none of these
2.
The fundamental "particle" of a chemical element according to Dalton's theory is the
A.
electron
B.
molecule
C.
atom
D.
compound
3.
The chemical formula Al
2
O
3
indicates
A.
two atoms of aluminum and three atoms of oxygen
B.
three atoms of aluminum and two atoms of oxygen
C.
six atoms of each element
D.
five atoms of each element
E.
None of these is correct.
4.
Which atomic particle determines the chemical behavior of an atom?
A.
proton
B.
electron
C.
neutron
D.
nucleus
E.
none of these
5.
The halogens (Group 7) contain how many valence electrons?
A.
1
B.
7
C.
0
D.
8
E.
none of these
6.
The elements chlorine and iodine have similar chemical properties because they
A.
are both metals
B.
are in the same chemical period
C.
have the same number of electrons in their outer energy levels
D.
have the same number of stable isotopes
E.
none of these
7.
The alkali metals have how many valence electrons?
A.
8
B.
7
C.
3
D.
2
E.
1
8.
When electrons are shared unequally, chemists characterize these types of bonds as ______________.
A.
polar covalent
B.
ionic
C.
pure covalent
D.
unbalanced
E.
none of these
9.
Chemical bonds formed by the attraction of oppositely charged ions are called
A.
covalent bonds
B.
magnetic bonds
C.
coordinate bonds
D.
ionic bonds
E.
none of these
10.
Atoms with greatly differing electronegativity values are expected to form
A.
no bonds
B.
polar covalent bonds
C.
nonpolar covalent bonds
D.
triple bonds
E.
ionic bonds
11.
Metals typically have ______________ electronegativity values.
A.
high
B.
low
C.
negative
D.
no
E.
two of these
12.
Nonmetal elements typically have ______________ electronegativities.
A.
low
B.
high
C.
neutral
D.
strong
E.
none of these
13.
Which of the following bonds would be the most polar without being considered ionic?
A.
Mg — O
B.
C — O
C.
O — O
D.
Si — O
E.
N — O
14.
Carbon dioxide has ______________ bonds.
A.
ionic
B.
covalent
C.
polar covalent
D.
magnetic
E.
none of these
15.
Which of the following compounds contains an ionic bond?
A.
HCl
(g)
B.
NaCl
C.
CCl
4
D.
SO
2
E.
O
2
16.
The most electronegative element is
A.
He
B.
F
C.
At
D.
Cs
E.
O
17.
In the hydrogen chloride molecule, the atoms are held together by a(n)
A.
ionic bond
B.
polar covalent bond
C.
nonpolar bond
D.
double bond
E.
none of these
18.
Which of the following has nonpolar bonds?
A.
H
2
S
B.
HCl
C.
Br
2
D.
OF
2
E.
All are nonpolar.
19.
The number of polar covalent bonds in NH
3
is
A.
1
B.
2
C.
3
D.
4
E.
none of these
20.
Which of the following has ionic bonding?
A.
K
2
S
B.
SO
3
C.
CS
2
D.
SiH
4
E.
none of these
21.
One of the most important characteristics of the water molecule is its ______________, which allows it to surround and attract both positive and negative ions.
A.
polarity
B.
strength
C.
magnetism
D.
fluidity
E.
stability
22.
A phosphorus atom needs to gain ______________ electrons to achieve a noble gas configuration.
A.
2
B.
3
C.
4
D.
5
E.
6
23.
Which of the following ions has the same electron configuration as an argon atom?
A.
Br
1-
B.
S
3-
C.
P
3+
D.
K
+
E.
Ca
+
24.
The electron configuration for Ca
2+
is identical with
A.
Ne
B.
Kr
C.
Ca
D.
Ar
25.
Magnesium reacts with sulfur to form
A.
MgS
B.
MgS
2
C.
Mg
2
S
D.
Mg
2
S
3
E.
none of these
26.
Calcium reacts with fluorine to form
A.
CaF
B.
CaF
2
C.
Ca
2
F
D.
Ca
2
F
3
E.
none of these
27.
Which of the following compounds is the product of the reaction Mg + O
2
?
A.
MgO
B.
MgO
2
C.
MgO
3
D.
Mg
2
O
E.
Mg
2
O
3
28.
Which of the following is the product of the reaction Al + O
2
?
A.
AlO
B.
AlO
2
C.
AlO
3
D.
Al
3
O
2
E.
Al
2
O
3
29.
When they react chemically, the alkali metals (Group 1)
A.
gain one electron
B.
gain seven electrons
C.
gain or lose seven electrons
D.
lose one electron
30.
The formula of the compound formed in the reaction between lithium and sulfur is
A.
LiS
B.
LiS
2
C.
Li
2
S
3
D.
Li
2
S
E.
none of these
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