WorksheetsChemical Reactions
Total questions: 20
Worksheet time: 20mins
Name
Class
Date
1.
What is the chemical equation that represent the following word equation?
Calcium oxide and carbon dioxide is formed when calcium carbonate decomposes
Calcium oxide and carbon dioxide is formed when calcium carbonate decomposes
a)
CaCO3 --------> CaO + CO2
b)
CaSO3 ---------> CaO + SO2
c)
CaO + CO2---------> CaCO3
d)
CaO + SO2-----------> CaSO3
2.
Iron reacts with the oxygen present in the atmosphere to form iron (III) , what is the chemical equation that represent that chemical change?
a)
Fe + O ---------> FeO
b)
Fe + O2---------> FeO
c)
Fe + O2--------> Fe2O3
d)
Fe + O2-------> Fe3O2
3.
When lithium reacts with sulfuric acid(H2SO4), lithium sulfate is formed and hydrogen is released. What is the balanced chemical equation that represent that chemical change?
a)
Li + H2SO4-------> Li2SO4 + H2
b)
2Li + H2SO4-------> Li2SO4 + H2
c)
2Li + H2SO4 --------> LiSO4 + H2
d)
None of the above
4.
If 20 grams of calcium reacts with 40 grams of water, how many grams of calcium hydroxide will form?
a)
20
b)
40
c)
60
d)
80
5.
Calcium hydroxide reacts with HCl to form calcium chloride and water. Which type of chemical reaction was represented in the example?
a)
synthesis
b)
double replacement
c)
combustion
d)
decomposition
6.
When a metal reacts with a non metal, a _______ is formed. This is an example of a __________ reaction
a)
covalent compound, synthesis
b)
covalent compound, decomposition
c)
ionic compound, synthesis
d)
ionic compound, decomposition
7.
If the arrangement of atoms in a substance changes, then which of the following is true?
a)
A chemical reaction has occurred
b)
The physical state of the substance changes
c)
The chemical properties of the substance stay the same but the physical properties change
d)
The physical properties of the substance stay the same but the chemical properties change
8.
A combustion reaction is also a(n) ___________ chemical reaction
a)
endothermic
b)
exothermic
c)
synthesis
d)
None of the above
9.
Metallic chlorates, when heated, results in metallic chlorides and oxygen. This is a ________ reaction
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
10.
If an acid reacts with a metal, what products will form?
a)
covalent compound and hydrogen gas
b)
covalent compound and water
c)
ionic compound and hydrogen gas
d)
ionic compound and water
11.
According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
a)
there is no relationship
b)
the mass of products is sometimes greater
c)
the mass of the reactants is greater
d)
the masses are always equal
12.
Which of the following materials will burn fastest in open air?
a)
a log, two feet in diameter
b)
two logs, each one foot in diameter
c)
a pile of small splinters made from a two foot diameter log
d)
Both logs and the splinters will burn at the same rate
13.
Which of the following is certain proof a chemical reaction has occurred?
a)
bubbles and fizzing
b)
change of chemical properties
c)
change of color
d)
all of the above
14.
Which of the following is NOT a result of a chemical reaction?
a)
bubbles in boiling water
b)
a solid forming from two liquids reacting
c)
copper turning green when exposed air
d)
the light given off by a firefly
15.
Zinc combines with hydrochloric acid (HCl) to form Zinc chloride and hydrogen. This is an example of a __________ reaction
a)
exothermic
b)
synthesis
c)
single replacement
d)
combustion
16.
Carbon dioxide and water are formed when methane (CH4) burns in the presence of oxygen. This is an example of a(n) __________ reaction
a)
synthesis
b)
double replacement
c)
endothermic
d)
exothermic
17.
A catalyst is which of the following?
a)
a reactant
b)
a product
c)
both
d)
neither
18.
Calcium oxide and carbon dioxide is formed when calcium carbonate decomposes. What are the reactants in this chemical change?
a)
Ca2O
b)
Ca2O and CO2
c)
CaCO3
d)
CaCO3 and CO2
19.
In a synthesis reaction when a non metal reacts with another non metal a ___________ is formed
a)
ionic compound
b)
molecule of water
c)
molecule of hydrogen
d)
covalent compound
20.
A(n) __________ slows or stops a chemical reaction
a)
catalyst
b)
enzyme
c)
activator
d)
inhibitor
100 %
