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Nuclear Chemistry Review

Total questions: 42

Worksheet time: 22mins

Name
Class
Date
1.

What occurs in a nuclear power plant when Uranium-235 splits into two smaller isotopes?

a)

nuclear fusion

b)

nuclear fission

c)

a chemical reaction

d)

a neutralization reaction

2.

The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?

a)

25g

b)

50g

c)

75g

d)

100g

3.

How many half-lives does it take a radioactive substance to decay until only one-eighth of the original substance remains?

a)

two

b)

three

c)

six

d)

eight

4.

The high energy yields created by nuclear fission are due to...

a)

binding nuclei.

b)

hydrogen bonding.

c)

secondary recovery.

d)

chain reactions.

5.

Nuclear reactors convert heat energy into mechanical energy, used to generate electrical energy, by...

a)

harnessing electromagnetic discharge.

b)

turning a turbine with steam.

c)

gathering solar radiation.

d)

using an electron transfer system.

6.

Which of the following BEST describes what occurs in a fusion reaction?

a)

Two low mass nuclei are joined to form one nucleus and gives off energy.

b)

A single nucleus divides into two or more nuclei and gives off energy.

c)

Electrons are shared between the nuclei.

d)

A chemical reaction occurs between the nuclei.

7.
What happens when the number of protons in an atom changes? 
a)
The number of electrons changes too 
b)
Usually nothing happens, unless the atom is radioactive 
c)
The atomic nucleus explodes
d)
It becomes a completely different atom, with different properties 
8.
In what part of an atom can protons be found? 
a)
Inside the electrons
b)
Inside the neutrons 
c)
Inside the atomic nucleus 
d)
 Inside the electron shells
9.
Which type of nuclear radiation is being emitted here?
a)
alpha
b)
beta
c)
gamma
d)
none
10.
Which type of nuclear radiation is being emitted here?
a)
Alpha
b)
beta
c)
gamma 
d)
none
11.
Two or more nuclei combine to form one larger nucleus in the process of nuclear _____.
a)
Fusion
b)
Fission
c)
Tracing
d)
Decay
12.
When nuclei decay, massive amounts of __________ is released.
a)
energy
b)
jello
c)
protons
d)
neutrons
13.
Has the highest penetrating power.  Can penetrate our body.  Even several cm thick of lead or several meters thick of concrete cannot stop all of it.
a)
Alpha
b)
Beta
c)
Gamma
14.
If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its atomic mass is:
a)
16
b)
32
c)
48
d)
64
15.
The time needed for half of a radioactive sample to decay is called its __________.
a)
decay period
b)
period
c)
transmutation time
d)
half-life
16.

This type of reaction supplies the energy that powers the stars and our Sun.

a)

Fission

b)

Fusion

17.

Spontaneous emission from the nucleus of an atom

a)

Positron

b)

Radioactivity

c)

Alpha particle

d)

Gamma radiation

e)

Beta particle

18.

What is the radioactive isotope placed in someone to track how a molecule travels through the body called?

a)

Tracer

b)

Detector

c)

Emitter

d)

Tracker

19.

What is the release of radiation particles due to the disintegration of an atom's nucleus called?

a)

Radioactivity

b)

Photovoltaic

c)

Thermodynamics

d)

Magnetism

20.

Organize these options into the right categories about Nuclear Reactors

Categorize the following

Tons of energy from very little materials

No greenhouse gases emitted

Water system pollution

Radioactive waste

Exposure to workers

Poorly maintained facilities

Benefits
Drawbacks
21.
Which produces more energy--nuclear fission or nuclear fusion?
a)
Fusion
b)
Fission
c)
They produce the same amount
d)
It depends on the elements used
22.
Beta particles have a _____ charge
a)
+1
b)
0
c)
-1
d)
+2
23.
How much Iodine-125 will remain after 100 years if the original sample had a mass of 80 grams and the half-life of I-125 is 25 years?
a)
20 grams
b)
2.5 grams
c)
5 grams
d)
10 grams
24.
If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.
a)
1.25mg
b)
1.25g
c)
10g
d)
10mg
25.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
26.
What is the symbol for an alpha particle?
a)
42He
b)
0-1e
c)
0+1 e
d)
10n
27.
What element is the ?
a)
Ag-115
b)
Cd-115
c)
Pd-115
d)
Not Listed
28.

When the isotope 5024X releases an alpha particle we get another element Y that looks like

a)

5022Y

b)

4622Y

c)

4820Y

d)

5426Y

29.

What is meant by the statement that 3215P has a half life of 14 days

a)

It takes 7 days to go down to 50% radioactivity each time

b)

It takes 14 days to lose 50% of its current isotope

c)

After 14 days it starts to become less radioactive

d)

It takes 14 days to go up by 50% radioactivity each time

30.
The half life of Thorium-234 is 24 days. What fraction of the element remains after 96 days
a)
1/2
b)
1/4
c)
1/8
d)
1/16
31.
What would two different isotopes of an atom have in common?
a)
Number of neutrons 
b)
Number of protons
c)
Atomic weight 
d)
Atomic mass
32.

After 22,800 years, approximately what percentage of the original carbon-14 remains?

a)

15%

b)

12.5%

c)

6.25%

d)

3.125%

33.
In the symbol 20682Pb what does 206 stand for?
a)
Mass number
b)
Atomic number
c)
Atomic mass
d)
Number of protons
34.
Radioactive materials have unstable...
a)
electrons
b)
protons
c)
nuclei
d)
neutrons
35.

What is the correct # of protons, electrons, and neutrons for Cobalt - 59?

a)

27 protons, 59 electrons, & 27 neutrons

b)

59 protons, 59 electrons, & 86 neutrons

c)

27 protons, 27 electrons, & 32 neutrons

d)

27 protons, 32 electrons, & 27 neutrons

36.

Which subatomic particle(s) determine the mass of the atom?

a)

protons & neutrons

b)

protons only

c)

protons & electrons

d)

neutrons & electrons

37.

What is an isotope?

a)

Atoms of the same element with different masses.

b)

Atoms of the same element with different # of protons.

c)

Atoms of the same element with different atomic numbers.

d)

Atoms of the same element with the different # of electrons.

38.

In the symbol 167N what does the 7 stand for?

a)

Mass number

b)

Atomic number

c)

Atomic mass

d)

Number of neutrons

39.
In the symbol 20682Pb what does 206 stand for?
a)
Mass number
b)
Atomic number
c)
Atomic mass
d)
Number of protons
40.

When two small nuclei combine into a larger nucleus.

a)

fission

b)

fusion

c)

alpha decay

d)

beta decay

41.

What is likely to happen to unstable nuclei with too many, or too few, neutrons?

a)

They will decay by emitting radiation.

b)

They will loose all their electrons.

c)

They will bond with other atoms.

42.
_______________ is the process by which unstable atoms emit radiation until they become stable.
a)
Radiation
b)
Chemical Reaction
c)
Radioactive Decay
d)
Isotopes

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