NEW
Font size
S
M
L
XL
WorksheetsChemical Reactions Challenge
Total questions: 40
Worksheet time: 25mins
Name
Class
Date
1.
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
Synthesis
b)
Decomposition
c)
Single replacement
d)
Double replacement
2.
3KOH + H3PO4 --> K3PO4 + 3H2O
a)
Synthesis
b)
Decomposition
c)
Single replacement
d)
Double replacement
3.
2Pb(NO3)2 --> 2PbO + 4NO2 + O2
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Combustion
4.
Which chemical reaction takes place when 2 substances react to form a single product?
a)
Decomposition
b)
Double Replacement
c)
Single Replacement
d)
Synthesis
5.
During an endothermic reaction, what happens to energy in relation to the surroundings?
a)
released to
b)
absorbed from
c)
mixed with
6.
During an exothermic reaction, what happens to energy in relation to the surroundings?
a)
released to
b)
absorbed from
c)
mixed with
7.
When carbon dioxide and water are in a reaction's product, what type of reaction may have occurred?
a)
combustion
b)
single
c)
double
d)
decomposition
8.
Breaking down a substance into simpler substances
a)
Displacement
b)
Synthesis
c)
Decomposition
d)
Oxidation
9.
The only sure evidence for a chemical reaction is
a)
the formation of a gas.
b)
a color change.
c)
the production of one or more new substances.
d)
changes in properties.
10.
A material used to decrease the rate of a chemical reaction is a(n)
a)
inhibitor
b)
catalyst
c)
enzyme
d)
fuel
11.
CaCO3 represents a chemical
a)
symbol
b)
subscript
c)
formula
d)
reaction
12.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products
d)
Matter is not changed
13.
Chemicals that act as biological catalysts by speeding up reactions in living things are called
a)
inhibitors
b)
fuels
c)
enzymes
d)
reactants
14.
Which of the following is an example of how to supply activation energy to begin a reaction?
a)
Cool the reaction flask in an ice bath.
b)
Add a catalyst
c)
Heat the reaction flask on a hot plate.
d)
Add an inhibitor.
15.
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a
a)
synthesis reaction.
b)
decomposition reaction
c)
replacement reaction.
d)
precipitate reaction.
16.
The amount of matter in a chemical reaction changes
a)
True
b)
False
17.
Synthesis is the process of making a more complex compound from simpler substances.
a)
True
b)
False
18.
The rate of a chemical reaction is independent of temperature.
a)
True
b)
False
19.
A chemical reaction may be detected by observing changes in the properties of matter.
a)
True
b)
False
20.
In a chemical equation, the substances written on the right side of the arrow are called ____________________.
a)
reactants
b)
products
21.
The _________________________ is the minimum amount of energy that must be added to start a chemical reaction.
a)
activation energy
b)
thermal energy
c)
chemical energy
d)
physical energy
22.
A reaction in which one element replaces another in a compound or in which two elements in different compounds trade places is called a(n) ____________________ reaction.
a)
replacement
b)
synthesis
c)
combustion
d)
decomposition
23.
Any change that alters a substance without changing it into another substance is a(n) ______________ change.
a)
chemical
b)
physical
24.
A reaction that releases energy in the form of heat is called a(n) ______________ reaction.
a)
exothermic reaction
b)
endothermic reaction
c)
chemical reaction
d)
physical reaction
25.
A(n) _____________ is a solid formed from liquid reactants during a chemical reaction.
a)
precipitate
b)
precipitation
c)
reactant
d)
compound
26.
Number telling how many molecules of a substance are involved in a chemical reaction.
a)
coefficient
b)
subscript
c)
superscript
d)
ratio
27.
substance(s) present after a reaction
a)
reactant
b)
product
c)
ions
d)
valence electrons
28.
reaction in which compounds are broken down into simpler substances
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Replacement
29.
substance present before a reaction
a)
product
b)
reactant
c)
ions
d)
precipitate
30.
_________ is the amount of a substance in a given volume.
a)
concentration
b)
solution
c)
enzyme
d)
catalyst
31.
something that speeds up a reaction
a)
catalyst
b)
inhibitor
c)
Oxidation Number
d)
preservatives
32.
something that slows down a reaction
a)
catalyst
b)
inhibitor
c)
temperature
d)
surface area
33.
_________________ are the elements and compounds that enter into a chemical reaction (on the left side of the arrow).
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
34.
Chemical reactions that absorb energy are known as ________________________.
a)
Endothermic
b)
Exothermic
c)
Boring
d)
Explosive
35.
The substances on the right side of the arrow are...
a)
products
b)
reactants
c)
inhibitors
d)
catalysts
36.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
37.
Will increasing the surface area of a catalyst make a difference to the speed of the reaction?
a)
yes
b)
no
c)
It depends on the substance
38.
Heating up two reactants will make the reaction...
a)
stay the same
b)
go slower
c)
become constant
d)
go faster
39.
In a chemical equation, the symbol that means dissolved in water is ____.
a)
(aq)
b)
(dw)
c)
(l)
d)
(s)
40.
What is activation energy?
a)
the amount of energy required to activate a phase change
b)
the amount of energy required to separate reactants from the products
c)
the energy difference between the reactants and the products
d)
the minimum amount of energy to break the bonds in reactants
Reset
