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WorksheetsBalancing Review
Total questions: 40
Worksheet time: 2hrs 14mins
Name
Class
Date
1.
3Na4
What is the coefficient?
a)
1
b)
2
c)
3
d)
4
2.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
3.
Balance this equation,
Ca + H2O --> CaO + H2
Ca + H2O --> CaO + H2
a)
Ca + 2H2O --> CaO + 2H2
b)
2Ca + H2O --> CaO + H2
c)
Its balanced as it is
d)
Cannot be balanced
4.
Balance this equation,
Al2O3 ---> Al + O2
Al2O3 ---> Al + O2
a)
Cannot be balanced
b)
2Al2O3 ---> 2Al + 3O2
c)
2Al2O3 ---> 4Al + 3O2
d)
3Al2O3 ---> 2Al + O2
5.
Name this reaction, Cl2 + 2KI --> I2 + 2KCl
a)
Synthesis
b)
Single Replacement
c)
Double Replacement
d)
Decomposition
6.
Name this reaction, CO2+ H2O --> H2CO3
a)
Decomposition
b)
Single Replacement
c)
Synthesis
d)
Combustion
7.
Which problem is balanced?
a)
PbO2 + 2H2
b)
So2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
d)
Lord Have Mercy - I am in Trouble
8.
What is a yield?
a)
The arrow in an equation that represents the chemical reaction.
b)
The beginning substances.
c)
The yellow light at a stop light
d)
What my parents say when I run to fast
9.
Is this equation balanced?: CS2 + 202 --> CO2 +2SO2
a)
Yes
b)
No
10.
What is a reactant?
a)
The chemical substances that begin the reaction.
b)
What comes from the reaction.
c)
A very hyper bobcat
d)
something in an energy drink
11.
Solve the problem:
Al + O2 --> Al2O3
Al + O2 --> Al2O3
a)
4Al + 3O2 --> 2Al2O3
b)
2Al + 4O2 --> Al2O3
c)
Al + 2O2 ----> 2ALO3
12.
What is a product?
a)
What's left of the yield sign
b)
The beginning formulas.
c)
The ending reactants
d)
Whats on the right side of the yield sign
13.
Which of these statements is true?
a)
Matter or mass can sometimes be created.
b)
In a chemical reaction, you must finish with the same elements you start with.
c)
Products have more atoms and elements than reactants.
14.
How many total atoms are present in the following:
3Al2SO4
3Al2SO4
a)
12
b)
21
c)
6
d)
3
15.
6C3H8
How many molecules is this?
How many molecules is this?
a)
2
b)
3
c)
4
d)
6
16.
O2
How many elements are there?
How many elements are there?
a)
2
b)
4
c)
1
d)
5
17.
2H2 + O2 ------> 2H20
In the equation above, how many atoms are in the Oxygen molecule?
In the equation above, how many atoms are in the Oxygen molecule?
a)
0
b)
1
c)
2
d)
3
18.
Name ALL the evidences that show a chemical reaction has occurred.
a)
color, gas, light
b)
light, precipitate, odor,
c)
color, gas, light, temperature, precipitate
d)
temperature, smell, light, conductivity, taste
19.
Which equation obeys the law of conservation of mass?
a)
H2 + O2 ------> H20
b)
C + 2H2 ----> CH4
c)
2Fe2O3 ------> 2O2 + 4Fe
20.
Na2CO3
How many total atoms are in sodium carbonate?
How many total atoms are in sodium carbonate?
a)
2
b)
3
c)
6
d)
10
21.
Name this reaction, CO2 + H2O --> H2CO3
a)
Decomposition
b)
Single Replacement
c)
Synthesis
d)
Combustion
22.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
23.
Which of the Following Correctly Balances this Equation?
_H2+_Cl2 --> _HCl
_H2+_Cl2 --> _HCl
a)
2H2 + Cl2 --> 4HCl
b)
H2+Cl2 --> 2HCl
c)
3H2 + 3Cl2 --> HCl
d)
H + Cl --> HCl
24.
True or False: When balancing chemical equations the subscripts can change.
a)
true
b)
false
25.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
Fe + S --> FeS
a)
balanced
b)
unbalanced
26.
What is the part of the chemical equation in green called?
Fe + S --> FeS
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
27.
Which coefficients correctly balance the formula equation
CaCO3(s) → CaO(s) + CO2(g)?
CaCO3(s) → CaO(s) + CO2(g)?
a)
1,1,1
b)
1,3,1
c)
2,6,3
d)
3,1,2
28.
Which coefficients correctly balance the formula equation
NH4NO2 → N2 + H2O?
NH4NO2 → N2 + H2O?
a)
1,2,2
b)
1,1,2
c)
2,1,1
d)
2,2,2
29.
What is the balanced equation when aluminum reacts with copper(II) sulfate to produce aluminum sulfate and copper?
a)
Al + Cu2S →Al2S + Cu
b)
2Al + 3CuSO4 → Al2(SO4)3 + 3Cu
c)
Al + CuSO4 → AlSO4 + Cu
d)
2Al + Cu2SO4 → Al2SO4 + 2Cu
30.
How many atoms of oxygen are represented in
2Ca(NO3)2?
2Ca(NO3)2?
a)
4
b)
6
c)
10
d)
12
31.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO
N2+O2--> _NO
a)
1
b)
2
c)
3
d)
4
32.
What is a chemical equation?
a)
A short way to show a chemical reaction using symbols
b)
A way to explain a chemical reaction using words
33.
Why is the following chemical equation not balanced?
H2 + O2 --> H2O
H2 + O2 --> H2O
a)
each side of the equation has a different number of oxygen atoms
b)
each side of the equation has a different number of hydrogen atoms
c)
each side has the same mass
34.
Balance this equation...
Sb2S3 + O2 --> Sb + SO2
Sb2S3 + O2 --> Sb + SO2
a)
It is balanced
b)
Sb2S3 + 3O2 --> 2Sb + 3SO2
c)
Sb2S3 + O2 --> 2Sb + SO2
d)
I don't know...Oh well!
35.
Balance this equation...
HgO --> 2Hg + O2
HgO --> 2Hg + O2
a)
It is balanced
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
36.
Which is Chemical Equation is Balanced?
a)
CH₄+O₂------CO₂+2H₂O
b)
H₂+O₂-----2H₂O₄
c)
4Al+3O₂-----2Al₂O₃
37.
Is the equation balanced?:
2H2O + O2 --> 4MgO + 3Fe
2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
38.
3H2O3
How many Hydrogen (H) atoms?
How many Hydrogen (H) atoms?
a)
2
b)
3
c)
6
d)
9
39.
What are the factors that affect a chemical reaction
a)
Concentration, Surface Area, Production of an odor, Production of heat and light
b)
Surface Area, Concentration, Temperature, Catalyst
c)
Production of a gas, Production of an odor, Production of heat or light, Color Change, Formation of a precipitate, Temperature change
d)
Temperature Change, Production of an odor, Surface Area, Catalyst
40.
If the reaction needs more energy than the reactants have, then
a)
The reaction will take place
b)
The reaction will not take place
c)
It will absorb energy from its surroundings and the reaction will occur
d)
The energy expended will increase over a plate of pancakes. For Pete's sakes please don't choose this answer
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