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WorksheetsChemical and Nuclear Reactions Review
Total questions: 23
Worksheet time: 12mins
A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be
balanced.
unbalanced.
an incomplete reaction.
a replacement reaction.
In a chemical equation, numbers often appear in front of a chemical formula. These numbers tell you the
number of atoms in each molecule in the reaction.
number of elements in the reaction.
number of molecules or atoms of each substance in the reaction.
number of molecules in each atom in the reaction.
This is an unbalanced equation representing a chemical reaction: HgO --> Hg + O2
Which equation below is the correctly balanced chemical equation for this reaction?
HgO --> Hg + 2O2
2HgO --> Hg + O2
2HgO --> 2Hg + O2
2HgO --> Hg + 2O2
Which of the following is a balanced chemical equation?
H2O2 --> H2O + O2
2 Fe2O3 + 3 C --> 4 Fe + 3 CO2
SO2 + O2 + 2 H2O --> 4 H2SO4
2 Mg + HC1 --> MgCl2 + H2
In chemical reactions, what does the principle of conservation of mass mean?
The total mass of the reactants is equal to the total mass of the products.
The total mass of the reactants is greater than the total mass of the products.
The total mass of the reactants is less than the total mass of the products.
Matter is not changed.
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a
synthesis reaction.
decomposition reaction.
replacement reaction.
precipitate reaction.
When one element replaces another element in a compound, the reaction is a ____ reaction.
composition
decomposition
single replacement
double replacement
What type of reaction is FeS + 2 HCl --> FeCl2 + H2S?
a synthesis reaction
a decomposition reaction
a single replacement reaction
a double displacement reaction
Which two processes could be considered opposites?
a decomposition reaction and a single replacement reaction
a single replacement reaction and a double replacement reaction
a precipitate reaction and a synthesis reaction
a synthesis reaction and a decomposition reaction
What type of chemical reaction is represented by this equation:
2Li + 2H2O --> 2LiOH + H2
decomposition
double replacement
single replacement
synthesis
Carbon-14 has a half life of approximately 5,700 years. How much of a 1000 g sample will be left undecayed and still radioactive after 11,400 years?
1000 g
500 g
250 g
125 g
Which radioactive decay can be stopped by a piece of paper?
alpha
beta
gamma
all of the above
In order to be blocked, which of the following requires several feet of concrete or a thick sheet of very dense material such as lead?
alpha
beta
gamma
all of the above
Which of the following statements relates to nuclear fission?
The reaction has no commercial applications.
The reaction takes place only at very high temperatures.
The reaction produces only short lived radioactive waste.
The reaction creates large amounts of energy when nuclei split apart.
The picture demonstrates what?
fission
fusion
radioactivity
Which of the following is common to both nuclear fusion and nuclear fission?
A chain reaction is needed to start the reaction.
Radioactive waste is produced as a byproduct.
Matter is converted into energy.
Temperatures over 1 million ºC are needed for the reaction to occur.
Which of the following are acceptable ways to dispose of nuclear waste from a nuclear power plant?
Dump it in the ocean far from land.
Bury it it deep in a concrete vault with a thick lead lining.
Put it in sealed drums in a controlled warehouse environment.
All of the other answers are correct.
Nuclear fusion is most likely to be found where?
in the core of the Sun
in the core of the Earth
in nuclear power plants
in microwave ovens
The equation represented is what kind of reaction?
nuclear fusion
nuclear fission
gamma radiation
According to the graph, what is the approximate half-life of carbon-14?
5.7 years
5,730 years
23,000 years
1,000,000 years
Nuclear power plants can create high-level radioactive waste. MOST nuclear waste can remain hazardous for up to
several hundred years.
several thousand years.
several hundred thousand years.
several billion years.
Which is an advantage of nuclear energy?
It produces no air pollution.
It causes no heat pollution.
It has no chance for accidents.
It produces radioactive waste.
The half-life of Practinium-226 is 2 minutes. If you started with 20 grams of Pa-226, how much do you have after 8 minutes?
10 g
5 g
2. 5 g
1.25 g
