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WorksheetsChemical Reactions
Total questions: 20
Worksheet time: 15mins
Name
Class
Date
1.
The substances that are present before a reaction are the...
a)
reactants
b)
products
c)
both of these
d)
neither of these
2.
___________________ are the elements or compounds that are formed in a chemical
reaction.
reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
3.
_______________ can speed up the rate of reactions and/or lower the amount of energy needed for
the reaction to take place.
the reaction to take place.
a)
Carbohydrates
b)
Fuel source
c)
Chemical
d)
Catalyst
4.
A change in which NEW substances are formed.
a)
Chemical change
b)
Physical change
c)
Casual change
d)
Formal change
5.
Element or compound?
H2O
H2O
a)
element
b)
compound
6.
Compounds break down into simpler substances in this type of reaction.....
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
7.
Name this reaction, CO2 + H2O --> H2CO3
a)
Decomposition
b)
Single Replacement
c)
Synthesis
d)
Combustion
8.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
9.
Is melting an object technically known as a chemical reaction?
a)
maybe?
b)
Yes
c)
No
10.
What is decomposition?
a)
putting substances together
b)
breaking substances apart
c)
element replacing another element in a compoud
d)
burning of a subtance
11.
A change in the size, shape, or state of matter.
a)
chemical change
b)
physical change
c)
chemical reaction
d)
electron change
12.
How many elements are in H2O?
a)
1
b)
2
c)
3
d)
4
13.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
14.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
15.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
16.
The only way you can be certain that a chemical reaction has occurred is by?
a)
Light has been emitted
b)
a colour change has occurred
c)
bubbles appear
d)
identifying one or more new chemical products
17.
Heating up two reactants will make the reaction...
a)
stay the same
b)
go slower
c)
become constant
d)
go faster
18.
How can you increase the rate of a reaction
a)
Decrease the pressure
b)
Increase the rate of collisions
c)
Decrease the concentration
d)
Increase the concentration
19.
Will increasing the surface area of a catalyst make a difference to the speed of the reaction?
a)
yes
b)
no
20.
What is the rate of reaction?
a)
How fast a reaction is
b)
How big a reaction is
c)
How loud a reaction is
d)
How much gas a reaction produces
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