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WorksheetsLCM and Balancing Equations
Total questions: 47
Worksheet time: 4hrs 55mins
Name
Class
Date
1.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
2.
a gel ice pack getting cold after you put it in the freezer for an hour.
a)
Chemical Change
b)
Physical Change
3.
What does the Law of Conservation of Matter state?
a)
Matter can be created and destroyed.
b)
Matter can be created, but not destroyed.
c)
Matter cannot change.
d)
Matter cannot be created or destroyed.
4.
The large number in front of a chemical formula or compound is the ___________.
a)
coefficient
b)
product
c)
subscript
d)
reactant
5.
In every balanced chemical equation, each side of the equation has the same number of ____.
a)
coefficients
b)
molecules
c)
atoms of each element
6.
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
7.
_BaS + _PtF2
--->
BaF2 + PtS
--->
BaF2 + PtS
a)
1 BaS + 1 PtF2 --->
BaF2 + PtS
BaF2 + PtS
b)
4 BaS + 2 PtF2 --->
BaF2 + PtS
BaF2 + PtS
c)
1 BaS + 2 PtF2 --->
BaF2 + PtS
BaF2 + PtS
d)
1 BaS + 3 PtF2 --->
BaF2 + PtS
BaF2 + PtS
8.
Which is the correct chemical formula for methane?
a)
(CH)4
b)
C4H4
c)
CH4
d)
C4H
9.
How many oxygen atoms are represented? 4Al2O3
a)
2
b)
8
c)
12
d)
20
10.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
Fe + S --> FeS
a)
balanced
b)
unbalanced
11.
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
12.
How many total atoms are represented? 4Al2O3
a)
2
b)
8
c)
5
d)
20
13.
How many Aluminum atoms are represented? 4Al2O3
a)
4
b)
8
c)
12
d)
20
14.
How many atoms are in C6H12O6?
a)
1
b)
3
c)
12
d)
24
15.
How many elements are in C6H12O6?
a)
1
b)
3
c)
12
d)
24
16.
In the equation 2Mg + O2 -> 2MgO,
which are the reactants?
which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
17.
How many H2O2 molecules are in the reactant?
a)
2
b)
4
c)
8
d)
1
18.
How many water (H2O) molecules are produced?
a)
2
b)
4
c)
8
d)
1
19.
How many oxygen (O2) molecules are produced?
a)
2
b)
4
c)
8
d)
1
20.
How many oxygen atoms are produced?
a)
2
b)
4
c)
8
d)
1
21.
How many hydrogen atoms are reacting (in the reactant)?
a)
2
b)
4
c)
8
d)
1
22.
True or False: When balancing chemical equations the subscripts can change.
a)
True
b)
False
23.
Which of the following is evidence of a chemical reaction?
a)
fizzing
b)
water
c)
saltwater
d)
paper being cut in half
24.
The substances at the end of a chemical reaction are called the ____
a)
product
b)
yield
c)
chemical
d)
reactants
25.
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
26.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
27.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
28.
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
29.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
Fe + S --> FeS
a)
balanced
b)
unbalanced
30.
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
d)
coefficient
31.
When balancing equations what does
-->
mean?
-->
mean?
a)
subscript
b)
equals
c)
it is just an arrow
d)
yields
32.
Which of the following is an unbalanced equation?
a)
CaCO3 --> CaO + CO2
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 3O2 --> CO2 + 2SO2
33.
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
34.
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
35.
_NaF + _Br2
--->
2NaBr + F2
--->
2NaBr + F2
a)
1NaF + 2 Br2 --->
2NaBr + F2
2NaBr + F2
b)
2NaF + 2 Br2 --->
2NaBr + F2
2NaBr + F2
c)
2 NaF + 3 Br2 --->
2NaBr + F2
2NaBr + F2
d)
2 NaF + 1 Br2 --->
2NaBr + F2
2NaBr + F2
36.
Is this equation balanced?
a)
yes
b)
no
37.
Is this equation balanced?
a)
yes
b)
no
38.
Is this equation balanced?
a)
yes
b)
no
39.
Is this equation balanced?
a)
yes
b)
no
40.
_P4+_O2
--->
_P2O3
--->
_P2O3
a)
3 P4+1 O2 ---> 2 P2O3
b)
1 P4+1 O2 ---> 2 P2O3
c)
1 P4+ 3 O2 ---> 2 P2O3
d)
1 P4+ 2 O2 ---> 3 P2O3
41.
_Al + _HCl
--->
H2 + AlCl2
--->
H2 + AlCl2
a)
2 Al + 2 HCl --->
H2 + AlCl2
H2 + AlCl2
b)
3 Al + 3 HCl --->
H2 + AlCl2
H2 + AlCl2
c)
1 Al + 1 HCl --->
H2 + AlCl2
H2 + AlCl2
d)
2 Al + 6 HCl --->
H2 + AlCl2
H2 + AlCl2
42.
_SO2 + _Li2Se
--->
SSe2 + 2Li2O
--->
SSe2 + 2Li2O
a)
1 SO2 + 2 Li2Se --->
SSe2 + 2Li2O
SSe2 + 2Li2O
b)
1 SO2 + 1 Li2Se --->
SSe2 + 2Li2O
SSe2 + 2Li2O
c)
2 SO2 + 2 Li2Se --->
SSe2 + 2Li2O
SSe2 + 2Li2O
d)
2 SO2 + 2 Li2Se --->
SSe2 + 2Li2O
SSe2 + 2Li2O
43.
_N2 + _F2
--->
2NF3
--->
2NF3
a)
1 N2 + 3 F2 --->
2NF3
2NF3
b)
3 N2 + 2 F2 --->
2NF3
2NF3
c)
4 N2 + 2 F2 --->
2NF3
2NF3
d)
3 N2 + 4 F2 --->
2NF3
2NF3
44.
_CH4 + _O2
--->
CO2 + 2H2O
--->
CO2 + 2H2O
a)
6 CH4 + 9 O2 --->
CO2 + 2H2O
CO2 + 2H2O
b)
2 CH4 + 1 O2 --->
CO2 + 2H2O
CO2 + 2H2O
c)
3 CH4 + 2 O2 --->
CO2 + 2H2O
CO2 + 2H2O
d)
1 CH4 + 2 O2 --->
CO2 + 2H2O
CO2 + 2H2O
45.
_MgF2 + _Li2CO3
--->
MgCO3 + 2LiF
--->
MgCO3 + 2LiF
a)
1 MgF2 + 2 Li2CO3 --->
MgCO3 + 2LiF
MgCO3 + 2LiF
b)
6 MgF2 + 9 Li2CO3 --->
MgCO3 + 2LiF
MgCO3 + 2LiF
c)
2 MgF2 + 2 Li2CO3 --->
MgCO3 + 2LiF
MgCO3 + 2LiF
d)
1 MgF2 + 1 Li2CO3 --->
MgCO3 + 2LiF
MgCO3 + 2LiF
46.
_K + _Cl2
--->
2KCl
--->
2KCl
a)
2 K + 16 Cl2 --->
2KCl
2KCl
b)
2 K + 1 Cl2 --->
2KCl
2KCl
c)
3 K + 4 Cl2 --->
2KCl
2KCl
d)
1 K + 1 Cl2 --->
2KCl
2KCl
47.
What coefficients are needed to correctly balance the equation?
_Bi + _O2 > _Bi2O3
_Bi + _O2 > _Bi2O3
a)
3,2,3
b)
2,3,2
c)
4,3,2
d)
none of these
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