Completing the Model of the Atom
Practice Test
1.
What is the missing product in this balanced equation describing the decomposition of water? 2H
2
O(l) + energy
O
2
(g) +
a.
2H
2
(g)
b.
H
2
O(g)
c.
energy
d.
H
2
(g)
2.
This element is in period two of the periodic table and has four dots in its Lewis dot diagram.
a.
oxygen
b.
carbon
c.
neon
d.
beryllium
3.
What is the maximum number of electrons that can be present in each principal energy level of hydrogen?
a.
2n
b.
n 2
c.
2n 2
d.
n
4.
These two elements combine to form water.
a.
hydrogen and oxygen
b.
carbon and oxygen
c.
hydrogen and chlorine
d.
carbon and hydrogen
5.
The Lewis electron-dot structure of the bromide ion shows ___________ valence electrons.
a.
seven
b.
one
c.
four
d.
eight
6.
Carbon dioxide is __________ in water.
a.
a solid
b.
blue
c.
insoluble
d.
soluble
7.
How many electrons may be contained in a p sublevel?
a.
eight
b.
three
c.
ten
d.
six
8.
A number placed before a formula to indicate how many units of the substance are involved in a chemical reaction is called a ____________.
a.
substrate
b.
superscript
c.
subscript
d.
coefficient
9.
An electron in an atom emits energy in the form of light when it ________________.
a.
leaves the atom
b.
leaves the nucleus
c.
rises to a new energy level
d.
falls back to a lower energy level
10.
Most alpha particles in Rutherford's gold-foil experiment ________________________.
a.
bounced back
b.
were deflected at large angles
c.
passed straight through the foil
d.
were deflected at small angles
11.
Adding energy to an equilibrium system that is exothermic to the right causes the system to ______________.
a.
shift to the right
b.
slow down
c.
remain unchanged
d.
shift to the left
12.
A ____________ reaction is one in which one element takes the place of another in a compound.
a.
synthesis
b.
decomposition
c.
double displacement
d.
single displacement
13.
Limestone, calcium carbonate, is a strong building material because of the ordered arrangement of __________ in its crystal structure.
a.
atoms
b.
molecules
c.
ions
d.
covalent bonds
14.
Sodium and chlorine react to produce ______________.
a.
sodium chlorine
b.
sodium chloride
c.
gaseous chlorine
d.
liquid sodium
15.
_________ is credited with formulating the modern atomic theory of matter, which has remained essentially intact up to the present time.
a.
Proust
b.
Lavoisier
c.
Archimedes
d.
Dalton
16.
What type of reaction is represented by the equation Pb(NO
3
)
2
+ K
2
CrO
4
PbCrO
4
+ 2KNO
3
?
a.
single displacement
b.
decomposition
c.
synthesis
d.
double displacement
17.
Changes in an equilibrium system can be described according to _____________ principle.
a.
Le Chatelier's
b.
Rutherford's
c.
Dalton's
d.
Boyle's
18.
These elements have some physical and chemical properties of metals and other properties of nonmetals.
a.
transition elements
b.
lanthanides
c.
actinides
d.
metalloids
19.
a.
blue
b.
green
c.
violet
d.
red
20.
The light emitted by the gas in a neon sign is _________________.
a.
an emission spectrum
b.
a filament
c.
an electron
d.
an incandescent light
