WorksheetsChemical Reactions
Total questions: 50
Worksheet time: 27mins
Name
Class
Date
1.
What type of chemical reaction is this one?
Al(OH)3 --> Al2O3 + H2O
Al(OH)3 --> Al2O3 + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
2.
What type of chemical reaction is this one?
CUO + CO2 --> CuCO3
CUO + CO2 --> CuCO3
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
3.
What type of chemical reaction is this one?
Mg + O2 --> MgO
Mg + O2 --> MgO
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
4.
What type of chemical reaction is this one?
Ca + MgCl2 --> CaCl2 + Mg
Ca + MgCl2 --> CaCl2 + Mg
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
5.
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
6.
Predict the products for the decomposition of potassium chlorate: KClO3
a)
KCl + O2
b)
K2O + Cl2
c)
K + ClO3
d)
K + ClO2
7.
Predict the products for the decomposition of calcium carbonate: CaCO3
a)
CaO + CO2
b)
Ca + CO3
c)
CaCO2 + O2
d)
CaO + CO3
8.
Predict the products for the this reaction:
K + HCl -->
K + HCl -->
a)
KCl + H2
b)
KHCl
c)
KH + Cl2
d)
KCl + H
9.
Predict the products for the this reaction:
Mg + CuCl2 -->
Mg + CuCl2 -->
a)
MgCl2 + Cu
b)
MgCl + Cu
c)
MgCu + Cl2
d)
CuMg + Cl2
10.
Predict the products for the this reaction:
AgNO3 + KCl -->
AgNO3 + KCl -->
a)
AgCl + KNO3
b)
AgK + ClNO3
c)
AgNO3 + KCl
d)
KAg + NO3Cl
11.
Solve the problem: Al + O2 --> Al2O3
a)
4Al + 3O2 --> 2Al2O3
b)
2Al + 4O2 --> Al2O3
12.
Solve the problem: Al + S --> Al2S3
a)
Al + 2S --> 2Al2S3
b)
2Al + 3S --> Al2S3
13.
What is a reactant?
a)
The chemical substances that begin the reaction.
b)
What comes from the reaction.
14.
Is this equation balanced?: CS2 + 202 --> CO2 +2SO2
a)
Yes
b)
No
15.
What is a yield?
a)
The arrow in an equation that represents the chemical reaction.
b)
The beginning substances.
16.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
17.
A replacement occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
18.
Decomposition occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
19.
What is a product?
a)
What's left of the chemical reaction.
b)
The beginning formulas.
20.
Chemical reactions that absorb energy are known as ________________________.
a)
Endothermic
b)
Exothermic
c)
Boring
d)
Reactions
21.
Chemical reactions that release energy are known as ________________________.
a)
Endothermic
b)
Exothermic
c)
Boring
d)
Reactions
22.
Which is NOT an example of chemical change?
a)
production of gas.
b)
change in color.
c)
change in size.
d)
transfer of energy.
23.
Which of the following could indicate a chemical change?
a)
All of the answers could indicate Chemical Change
b)
a color change has occurred
c)
bubbles appear
d)
identifying one or more new chemical products
24.
_________________ are the elements and compounds that react, or start, in a chemical reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
25.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
26.
Is melting an object technically known as a chemical reaction?
a)
I don't know
b)
Yes
c)
No
27.
A change in which NEW substances are formed.
a)
Chemical change
b)
Physical change
c)
Casual change
d)
Formal change
28.
___________________ are the elements or compounds that are formed or produced in a chemical reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
29.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-14
d)
1-20
30.
Which of the following is a PHYSICAL change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
31.
Which of the following IS a chemical change
a)
using chalk
b)
water freezing
c)
slicing cheese
d)
digestion
32.
Can matter be created or destroyed?
a)
Yes, it can be created.
b)
Yes, it can be destroyed.
c)
No, matter is always conserved
d)
None of these
33.
Evidence of a chemical reaction include:
a)
Phase change
b)
No new substance
c)
Bubbles forming
d)
Shape change
34.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
35.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
36.
Balance this equation, Ca + H2O --> CaO + H2
a)
Ca + 2H2O --> CaO + 2H2
b)
2Ca + H2O --> CaO + H2
c)
Its balanced as it is
d)
Cannot be balanced
37.
Balance this equation, Al2O3 ---> Al + O2
a)
Cannot be balanced
b)
2Al2O3 ---> 2Al + 3O2
c)
2Al2O3 ---> 4Al + 3O2
d)
3Al2O3 ---> 2Al + O2
38.
name this reaction, Ca + O --> CaO
a)
Decomposition
b)
Single Replacement
c)
Double Replacement
d)
Combustion
39.
Name this reaction, Cl2 + 2KI --> I2 + 2KCl
a)
Synthesis
b)
Single Replacement
c)
Double Replacement
d)
Decomposition
40.
Name this reaction, CO2 + H2O --> H2CO3
a)
Decomposition
b)
Single Replacement
c)
Synthesis
d)
Combustion
41.
Write a balanced reaction of, Magnesium burns....
a)
2Mg + 3O2 --> 3MgO
b)
Mg + H2O -- MgH
c)
2Mg + CO2 -- MgCO2
d)
2Mg + O2 --> 2MgO
42.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
43.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
44.
How many elements are in H2O?
a)
1
b)
2
c)
3
d)
4
45.
How many Al atoms are in this compound? 4Al2O3
a)
2
b)
8
c)
6
d)
4
46.
___________________ are the elements are compounds that leave (are formed in) a chemical
reaction.
reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
47.
Balance this equation: H2 + N2 → NH3
a)
H2 + 4N2 → NH3
b)
H2 + 3N2 → 2NH3
c)
3H2 + N2 → 2NH3
d)
2H2 + 2N2 → 2NH3
48.
Which is NOT an example of chemical change?
a)
production of gas.
b)
change in color.
c)
change in size.
d)
transfer of energy.
49.
Which is a Synthesis Reaction?
a)
A + B ----> AB
b)
AB -----> A + B
50.
Which is a Decomposition Reaction?
a)
AB --> A + B
b)
ab ----> a + B
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