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WorksheetsChemical Reactions - Unit Review
Total questions: 28
Worksheet time: 58mins
Name
Class
Date
1.
A chemical change in which a single compound breaks down into two or more simpler products is called a ______________________.
a)
single-replacement reaction
b)
synthesis reaction
c)
double-replacement reaction
d)
decomposition reaction
2.
This chemical equation for mercury oxide is an example of what type of reaction?
2HgO → 2Hg + O2
2HgO → 2Hg + O2
a)
decomposition reaction
b)
synthesis reaction
c)
combustion reaction
d)
Marvin the Martian reaction
3.
Choose the balanced chemical equation for the formation of iron oxide.
a)
2Fe + O2 → 2FeO2
b)
Fe + O2 → FeO2
c)
4Fe + 3O2 → 2Fe2O3
d)
4Fe + O2 → 2FeO2
4.
A chemical change in which two or more substances react to form a new substance is a ____________________________.
a)
decomposition reaction
b)
synthesis reaction
c)
double displacement reaction
d)
combustion reaction
5.
This chemical equation for magnesium oxide is an example of what type of reaction?
2Mg + O2 → 2MgO
2Mg + O2 → 2MgO
a)
decomposition reaction
b)
synthesis reaction
c)
single displacement reaction
d)
combustion reaction
6.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
7.
Which chemical reaction breaks down into 2 substances?
a)
Double displacement
b)
Single displacement
c)
Synthesis
d)
Decomposition
8.
What type of chemical reaction is this one?
C2H2 + O2 --> CO2 + H2O
C2H2 + O2 --> CO2 + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
9.
Why is Cl2 + KI → KCl + I2 not a synthesis reaction?
a)
Oxygen is not a reactant in this reaction.
b)
The reaction has more than one reactant.
c)
Oxygen is not a product in this reaction.
d)
The reaction has more than one product.
10.
What is the left part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
11.
What is the right part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
12.
What are the PRODUCTS of the chemical reaction pictured?
a)
CH4 and CO2
b)
CH4 and O2
c)
CO2 and H2O
d)
O2 and H2O
13.
CH4 + 2 O2 → CO2 + 2H2O
In this equation, CH4 is a
In this equation, CH4 is a
a)
product
b)
reactant
c)
displacement
d)
odd ball
14.
Ca + AlCl3→ CaCl2 + Al
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
15.
KOH + H3PO4 → K3PO4 + H2O
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
16.
Cu + 2Ag(NO3) → 2Ag + Cu(NO3)
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
17.
C3H6O + 4 O2 -->3 CO2 + 3 H2O
a)
single
b)
double
c)
combustion
d)
synthesis
18.
What are the products in the following chemical equation?
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
H2
b)
O2
c)
2H2 + O2
d)
2H2O
19.
What are the reactants in the following chemical equation?
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
H2
b)
O2
c)
2H2 + O2
d)
2H2O
20.
Which chemical reaction takes place when 2 substances react to form a single product?
a)
Decomposition
b)
Double Replacement
c)
Single Replacement
d)
Synthesis
21.
Another name for a "oxidation-reduction" reaction is
a)
chemical reaction
b)
neutralization reaction
c)
redox reaction
d)
nuclear reaction
22.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
23.
Balance this equation...
H2 + Cl2 --> HCl
H2 + Cl2 --> HCl
a)
It is balanced
b)
3H2 + Cl2 --> 6H2Cl
c)
H2 + Cl2 --> 2HCl
24.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction.
25.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
26.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
27.
Which of the following is the best description of a redox reaction?
a)
a reaction that results in the release of heat or light
b)
a reaction in which two new products are created
c)
a reaction in which the exchange of electrons (or oxygen) occurs
d)
a reaction in which a precipitate forms as a product
28.
Double-displacement reactions are often defined by which of the following?
a)
breakdown of only one compound
b)
formation of a precipitate
c)
use of oxygen as a reactant
d)
release of light
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