NEW
Font size
S
M
L
XL
WorksheetsChemical Reactions
Total questions: 21
Worksheet time: 11mins
Name
Class
Date
1.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
2.
Which of these is NOT a sign that a chemical change has occurred?
a)
A loss of transparency
b)
An unexpected color change
c)
A temperature change
d)
The formation of a precipitate
3.
In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?
a)
Reactants
b)
Products
c)
Atoms
d)
Catalysts
4.
A (n) ________________ reaction releases energy and temperature usually increases
a)
endothermic
b)
radioactive
c)
exothermic
d)
physical
5.
The Law of Conservation of Mass states
a)
that matter exists in all states and reacts the same
b)
that matter can only be changed into new substances by introducing a catalyst
c)
that matter exists in the same state throughout any chemical change
d)
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
6.
A reaction that occurs when two or more elements or compounds combine to make a more complex substance is called
a)
double replacement
b)
decomposition
c)
synthesis
d)
single replacement
7.
Balance this equation: ___ Cl2 + ___ KI → ___ KCl + ___ I2
a)
___ Cl2 +
___ KI → ___ KCl + 2 I2
b)
2 Cl2 +
___ KI → ___ KCl2 + ___ I2
c)
___ Cl2 +
2 KI → 2 KCl + ___ I2
8.
A ___________reaction absorbs energy and is usually accompanied by a decrease in temperature.
a)
exothermic
b)
combustion
c)
endothermic
d)
synthesis
9.
A ___________ takes part in a chemical reaction but is not consumed
a)
reactant
b)
catalyst
c)
product
d)
nucleus
10.
Balance this equation: H2 + N2 → NH3
a)
H2 + 4N2 → NH3
b)
H2 + 3N2 → 2NH3
c)
3H2 + N2 → 2NH3
d)
2H2 + 2N2 → 2NH3
11.
Occurs when one element replaces another one in a compound
a)
Synthesis
b)
Single replacement
c)
Double replacement
d)
Decomposition
12.
Photosynthesis is
a)
a double replacement reaction
b)
an exothermic reaction
c)
a decomposition reaction
d)
an endothermic reaction
13.
C6H12O6 + 6O2 → 6CO2 + 6H2O + energy is
a)
photosyntesis
b)
synthesis
c)
explosive
d)
respiration
14.
Balance this equation: S8 + O2 → SO2
a)
S8 + 2O2 → 8SO2
b)
S8 + 4O2 → 8SO2
c)
S8 + 8O2 → 8SO2
15.
Occurs when different atoms in two different compounds trade places
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
16.
6CO2 + 6H2O + energy → C6H12O6 + 6O2 is.....
a)
Respiration
b)
Exothermic
c)
Photosynthesis
d)
Decomposition
17.
How many Al atoms are in this compound? 4Al2O3
a)
2
b)
8
c)
6
d)
4
18.
Compounds break down into simpler substances in this type of reaction.....
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
19.
This image represents
a)
a double replacement reaction
b)
a decomposition reaction
c)
a single replacement reaction
d)
a complex compound reaction
20.
This picture represents
a)
Synthesis
b)
Double Replacement
c)
Single Replacement
d)
Decomposition
21.
How many F atoms are in this compound?
6MgF2
6MgF2
a)
2
b)
6
c)
8
d)
12
Reset
