Completing the Model of the Atom
Practice Test
1.
A substance that increases the rate of a chemical reaction without being permanently changed or consumed is called ______________.
a.
a product
b.
a catalyst
c.
a reactant
d.
an equilibrate
2.
a.
green
b.
violet
c.
blue
d.
red
3.
A reaction between magnesium chloride and silver nitrate yields magnesium nitrate and silver chloride. What is the coefficient for magnesium nitrate in the balanced equation for the reaction?
a.
4
b.
3
c.
2
d.
1
4.
An element's emission spectrum is thought to be produced when electrons move from _____________.
a.
higher to lower energy levels
b.
the nucleus to energy levels
c.
lower to higher energy levels
d.
inside the atom to outside the atom
5.
The nucleus of this atom contains nine protons and nine neutrons.
a.
neon-18
b.
fluorine-18
c.
oxygen-18
d.
nitrogen-19
6.
The Heisenberg uncertainty principle states that it is fundamentally impossible to know both the ____________________ of the electron at the same time.
a.
mass and size
b.
mass and position
c.
energy and orientation
d.
position and energy
7.
n- and p-type semiconductors may be combined to form _____________.
a.
cathode-ray tubes
b.
diodes
c.
vacuum tubes
d.
transistors
8.
Greek philosophers thought these four elements formed all matter.
a.
hydrogen, oxygen, carbon, nitrogen
b.
earth, sea, air, plasma
c.
carbon, phosphorus, calcium, oxygen
d.
earth, air, fire, water
9.
When hydrogen and oxygen react to form water, ______________.
a.
energy is absorbed
b.
the reaction is endothermic
c.
the mass increases
d.
energy is released
10.
The two rows beneath the main body of the periodic table contain the _________________.
a.
inner transition elements
b.
noble gases
c.
halogens
d.
alkali metals
11.
A ____________ reaction is one in which a compound breaks down into two or more simpler substances.
a.
decomposition
b.
photosynthesis
c.
replacement
d.
synthesis
12.
Except for helium, noble gas atoms have _________.
a.
octets
b.
trios
c.
quartets
d.
duets
13.
Carbon dioxide is __________ in water.
a.
insoluble
b.
blue
c.
soluble
d.
a solid
14.
What type of reaction is represented by the equation Pb(NO
3
)
2
+ K
2
CrO
4
PbCrO
4
+ 2KNO
3
?
a.
double displacement
b.
single displacement
c.
decomposition
d.
synthesis
15.
In natural waste-disposal processes, atoms are ___________.
a.
recycled
b.
destroyed
c.
made into aluminum
d.
created
16.
A system is said to be in ___________ when no net change in the amounts of reactants and products occurs.
a.
state
b.
dislacement
c.
reverse
d.
equilibrium
17.
Heavy elements such as seaborgium are created in _____________.
a.
erlenmeyer flasks
b.
earthquakes
c.
particle accelerators
d.
test tubes
18.
How many single and double covalent bonds does a carbon atom have in a carbon dioxide molecule?
a.
two double bonds
b.
four single bonds
c.
two triple bonds
d.
one double bond and two single bonds
19.
This compound is commonly found in all three states of matter on Earth's surface.
a.
iron oxide
b.
sodium chloride
c.
carbon dioxide
d.
water
20.
Changes in energy, color, and odor are indications that a _____________ has taken place.
a.
chemical reaction
b.
precipitation reaction
c.
displacement reaction
d.
separation reaction
