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WorksheetsUnit 1 Exam Review-Chemical Reactions
Total questions: 25
Worksheet time: 20mins
Name
Class
Date
1.
A glass of water undergoes four changes: First it is frozen solid. Next, the ice is crushed into small pieces of ice. Third, the ice melts, and fourth, an electrical current is passed through the water to separate out hydrogen and oxygen. Which of the following represents the correct sequence of changes to the water?
a)
physical, physical, chemical, chemical
b)
physical, chemical, physical, chemical
c)
physical, physical, physical, chemical
d)
chemical, chemical, chemical, physical
2.
Which of the following represents a chemical change to matter?
a)
digestion of food
b)
melting an ice cube
c)
cutting wood
d)
shredding paper
3.
Consider the equation S + O2 → SO2. What is the product?
a)
S
b)
O2
c)
SO2
d)
S + O2
4.
In an exothermic reaction, energy may be released to the surroundings in the form of
a)
heat
b)
light
c)
heat and light
d)
none of the above
5.
A chemical reaction takes place within a test tube. After the reaction, the test tube feels warmer than it did before the reaction. The reaction was
a)
endothermic
b)
exothermic
c)
ectothermic
d)
exerthermic
6.
During an endothermic reaction, energy is
a)
combine with the surroundings
b)
released to the surroundings
c)
absorbed from the surroundings
d)
none of the above
7.
What type of reaction does the generalized equation A + B → AB represent?
a)
synthesis
b)
decomposition
c)
single displacement
d)
double displacement
8.
What type of reaction does the generalized equation AB → A + B represent?
a)
synthesis
b)
decomposition
c)
single displacement
d)
double displacement
9.
Which of the following is a synthesis reaction?
a)
2 H2 + O2 → 2H2O
b)
2 H2O → H2 + O2
c)
CaCO3 → CaO + CO2
d)
None of the above
10.
All chemical reactions involve a transfer of energy.
a)
True
b)
False
11.
Though energy can change forms, the total amount of energy in the universe remains constant.
a)
True
b)
False
12.
In a chemical reaction, there must be the same number of atoms in the product side as there are on the reactants side.
a)
True
b)
False
13.
In the chemical formula CH4, how many atoms of hydrogen (H) are there?
a)
2
b)
3
c)
4
d)
6
14.
In the chemical formula 2NO2, how many atoms of oxygen (O) are there?
a)
2
b)
4
c)
6
d)
8
15.
Which number should be placed in the blank to balance the equation?
Xe + ___F2 → XeF2
Xe + ___F2 → XeF2
a)
1
b)
2
c)
3
d)
4
16.
How many total carbon (C) atoms are present in the reactants side of the equation C2H5OH + 3O2 → 2CO2 + 3H2O?
a)
1
b)
2
c)
3
d)
4
17.
In nuclear fission, atomic nuclei are
a)
split
b)
joined together
c)
created
d)
none of the above
18.
In a nuclear power plant, the chain reaction takes place within the
a)
turbine
b)
generator
c)
reactor
d)
water tank
19.
Most nuclear waste in the US is
a)
low-level
b)
transuranic
c)
high-level
d)
weapons grade
20.
Which type of nuclear waste can be MOST safely handled?
a)
low-level
b)
transuranic
c)
high-level
d)
weapons grade
21.
Nuclear power has the advantage over coal in that nuclear power does not produce as much carbon dioxide as coal.
a)
True
b)
False
22.
Which of the following takes place during a single displacement reaction?
a)
a complex substance breaks down into two or more simple substances
b)
a single substance replaces another substance in a compound
c)
two simple substances combine to form a new complex substance.
23.
When chemical bonds are formed, energy is
a)
released
b)
absorbed
c)
created
d)
combined
24.
Two light nuclei combine to form a heavier one in nuclear
a)
fusion
b)
fission
c)
radioactive decay
d)
alpha decay
25.
If an atomic nucleus spontaneously emits two protons and two neutrons, then what has taken place?
a)
alpha decay
b)
beta decay
c)
gamma decay
d)
none of the above
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