Electrons in Atoms
Practice Test
1.
A wavelength of 500 nm is associated with the _______ portion of the electromagnetic spectrum.
a.
microwave
b.
ultraviolet
c.
infrared
d.
visible
2.
Which of the following is not a fundamental particle in an atom?
a.
neutron
b.
element
c.
electron
d.
proton
3.
A characteristic that can be observed or measured without changing the sample’s composition is ________________.
a.
a gaseous property
b.
a physical property
c.
a crystalline property
d.
a chemical property
4.
A solution of solids is a(n)___________.
a.
heterogeneous mixture
b.
alloy
c.
filtration
d.
pure metal
5.
Seawater is not a substance because __________.
a.
its composition may be different from sample to sample
b.
it is salty
c.
it has hydrogen as part of its composition
d.
it is a liquid
6.
When an atom loses energy by electron transition, a(n) _____________ is produced.
a.
ion
b.
adsorption
c.
emission
d.
absorption
7.
Which of the following statements is correct?
a.
The nucleus is mostly empty space.
b.
A proton is about 2000 times more massive than an electron.
c.
An electron is about 2000 times more massive than a proton.
d.
A neutron will always be found orbiting the nucleus.
8.
What is the name for atoms of an element that have different masses?
a.
isotopes
b.
isomers
c.
allotropes
d.
alloforms
9.
What is the electron configuration for tin (Sn)?
a.
[Kr]5s
2
3d
10
3f
14
5p
4
b.
[Kr]5s
2
3d
10
4d
14
5p
4
c.
[Kr]5s
2
4d
10
5p
2
d.
[Kr]5s
2
3d
10
4f
14
5p
2
10.
What can you conclude from the deflection of a cathode ray in a magnetic field?
a.
The ray must be composed of iron.
b.
The ray must need to travel in a vacuum.
c.
The ray must have a positive charge.
d.
The ray must be composed of charged particles.
11.
What is the smallest particle of an element that maintains the properties of the element?
a.
molecule
b.
mixture
c.
atom
d.
cation
12.
In the following chemical reaction, how do you classify hydrogen and oxygen?
2H
2
+ O
2
→ 2H
2
O
a.
physical changes
b.
chemical properties
c.
products
d.
reactants
13.
How can the law of conservation of mass apply to a burning log, if all that remains of it is ash?
a.
The law of conservation of mass applies to changes of state but not to chemical reactions.
b.
The law of conservation of mass applies to substitution and displacement reactions, but not to combustion reactions.
c.
The masses of the gases and water vapor released into the air by the combustion reaction plus the mass of ash equal the mass of the log before burning.
d.
The ash has the same mass as the log, although a large percentage of it blows away.
14.
How many types of orbitals are present in atoms of elements in the third period of the periodic table?
a.
1
b.
3
c.
4
d.
2
15.
What is the wavelength of an object moving at 19.4 m/s and having a mass of 1000 kg?
a.
34 m
b.
1.3 x 10
-38
m
c.
3.4 x 10
-38
m
d.
3.4 x 10
-34
m
16.
How is the slope of a linear graph calculated?
a.
slope = (x
2
– x
1
) / (y
2
– y
1
)
b.
slope = (y
2
– y
1
) x 100
c.
slope = (x
2
– x
1
) / 100
d.
slope = (y
2
– y
1
) / (x
2
– x
1
)
17.
How is the atomic mass unit (amu) defined?
a.
1/13 the mass of a carbon-13 atom
b.
1/12 the mass of a carbon-12 atom
c.
1/16 the mass of an oxygen-16 atom
d.
1/14 the mass of a nitrogen-14 atom
18.
The representation of data on graph that resembles a pizza is a _________.
a.
line graph
b.
bar graph
c.
inverse
d.
circle graph
19.
The concept that all moving particles have wave characteristics is attributed to ___________.
a.
de Broglie
b.
Heisenberg
c.
Thomson
d.
Bohr
20.
A technique that uses the differences in boiling point to separate homogeneous mixtures is _________.
a.
crystallization
b.
chromatography
c.
filtration
d.
distillation
