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WorksheetsChemical Reactions Review
Total questions: 40
Worksheet time: 23mins
Name
Class
Date
1.
What is one way to increase the speed of a reaction?
a)
Increase temperature
b)
You cannot speed up a reaction
c)
Lower temperature
d)
Add an inhibitor
2.
The starting materials in a chemical reaction are ___.
a)
Products
b)
Reactants
c)
Starters
d)
Coefficients
3.
A substance that is formed as the result of a chemical reaction is a __
a)
Product
b)
Reactant
c)
Starters
d)
coefficient
4.
A process or reaction in which the system absorbs energy from its surroundings is a(n) ___
a)
Endothermic Reaction
b)
Exothermic Reaction
c)
Diffusion
d)
Fission
5.
A chemical reaction that releases energy by light or heat is a(n) ---.
a)
Endothermic Reaction
b)
Exothermic Reaction
c)
Diffusion
d)
Fission
6.
A type of reaction in which two or more simple elements combine to form a more complex compound is a ___ reaction.
a)
Double replacement
b)
Single Displacement
c)
Synthesis
d)
Decomposition
7.
A type of reaction in which a compound is broken down into its simple elements is a ___ reaction.
a)
Double replacement
b)
Single Displacement
c)
Synthesis
d)
Decomposition
8.
This is a molecule of glucose. It has ___.
a)
6 carbon, 12 hydrogen and 6 oxygen atoms
b)
12 carbon, 6 hydrogen and 12 oxygen atoms
c)
24 glucose molecules
d)
A coeffcicnt of 6 and 12
9.
This appears on the left side of a chemical formula, and represents how many molecules there are.
a)
An Atom
b)
The Subscript
c)
A Molecule
d)
The coefficient
10.
How many hydrogen atoms are in this chemical formula:
a)
4 hydrogen atoms
b)
1 hydrogen atom
c)
2 hydrogen atoms
d)
3 hydrogen atoms
11.
How many oxygen atoms are in this chemical formula?
a)
7 oxygen atoms
b)
4 oxygen atoms
c)
3 oxygen atoms
d)
1 oxygen atoms
12.
How many oxygen atoms are in this molecule?
a)
6 oxygen atoms
b)
2 oxygen atoms
c)
3 oxygen atoms
d)
4 oxygen atoms
13.
A physical change.
a)
It changes the object into something different
b)
Objects or substances undergo a change that does not change their chemical composition
c)
it is just like a chemical reaction
d)
Paper burning
14.
A chemical change.
a)
a shoe lace cut in half
b)
doesn't change anything
c)
changes the look of an object
d)
change that results in the formation of new chemical substances
15.
How many Magnesium atoms are in 10MgCl2?
a)
10
b)
5
c)
20
d)
1
16.
What is the left part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
17.
What is the right part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
18.
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
19.
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 created
20.
The minimum amount of energy that has to be added to start a reaction is the ___.
a)
exothermic energy
b)
endothermic energy
c)
activation energy
d)
chemical energy
21.
A substance used to decrease the rate of a chemical reaction is a(n)
a)
inhibitor
b)
catalyst
c)
enzyme
d)
fuel
22.
A rapid reaction between oxygen and a fuel is known as
a)
combustion
b)
heat
c)
activation
d)
decomposition
23.
Chemicals that act as biological catalysts by speeding up reactions in living things are
a)
inhibitors
b)
enzymes
c)
fuels
d)
reactants
24.
Which is an example of a chemical reaction?
a)
paper cut into small pieces
b)
chocolate melting in a pan
c)
flour and sugar mixed in a bowl
d)
cookies baking in an oven
25.
A preservative may be used to slow decomposition of foods. This is an example of a(n) ___.
a)
GMO
b)
inhibitor
c)
oxymoron
d)
enzyme
26.
How many atoms of aluminum(Al) are in the following equation: 4Al + 3O2 --> 2Al2O3
a)
2
b)
6
c)
1
d)
4
27.
In a _______change, a substance changes into a different substance.
a)
Physical
b)
Chemical
c)
Wut?
28.
How many Hydrogen (H) atoms are in NH3O5?
a)
3
b)
4
c)
5
d)
1
29.
How many Oxygen (O) atoms are in 2C2HO8Cl2?
a)
2
b)
16
c)
8
d)
5
30.
How many atoms of carbon (C) atoms are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
31.
Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)
three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
3H2O
32.
Which is the correct formula for:
one carbon (C)
two oxygen (O)
one carbon (C)
two oxygen (O)
a)
CO2
b)
CO
c)
C2O
d)
2CO
33.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
34.
The blue numbers in the image below represent ________
a)
I don't know, and at this point I'm too afraid to ask
b)
coefficients
c)
subscripts
d)
none of the answers are correct
35.
How many atoms are there TOTAL in:
H2SO4?
H2SO4?
a)
6
b)
5
c)
7
d)
3
36.
Arthropods have an exoskeleton. This means arthropods have ___
a)
a skeleton on the inside
b)
a skeleton on the outside
c)
no skeleton
d)
4 skeletons
37.
An intermediary is a person who ___.
a)
works out compromise between people or groups
b)
who only hunts ducks at night
c)
speaks four languages
d)
has an outside skeleton
38.
The break between acts of a play is known as ___.
a)
intermission
b)
exobreak
c)
intraplay
d)
endotheactrics
39.
Tetramethylead is a dangerous central nervous system toxin that was used in gasoline. The chemical formula for tetramethylead is probably ___.
a)
C4H12Pb
b)
C9H9Pb9
c)
H2O2Au3
d)
Pb2O2C2
40.
These four-sided shapes are called ___.
a)
quadrangles
b)
isosceles Popsicles
c)
scalene vectors
d)
triangles
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