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Understanding Reactions and Balancing Equations

Total questions: 73

Worksheet time: 2hrs 2mins

Name
Class
Date
1.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
2.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
3.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
4.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
5.
How many Mn atoms are found in the following compound?
3Cr(MnO4)6
a)
3
b)
4
c)
6
d)
18
6.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
7.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
8.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
9.
Element or compound?
H2O
a)
Element
b)
Compound
10.
Element or compound?
O2
a)
Element
b)
Compound
11.
What is the number before a chemical formula called?
Ex: 2H2 + O2 --> 2H2O
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
12.
How many aluminum atoms are in Al2(SO4)3?
a)
1
b)
2
c)
3
d)
4
13.
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
a)
H3PO4
b)
H2SO4
c)
HClO3
d)
H2O
14.
How many atoms are in the neurotransmitter serotonin? The formula for serotonin is C10H12N2O
a)
10
b)
20
c)
25
d)
23
15.
What information could a student determine from only the chemical formula of a protein?
a)
The color of the protein
b)
The number of molecules in each sequence of the protein
c)
The physical arrangement of atoms in the structure of the protein
d)
The number of atoms of each element in the protein
16.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
17.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
18.
Is the following reaction balanced?
NaHCO3 --> Na2CO3 + H2O + CO2
a)
yes
b)
no
19.
Is the following reaction balanced?
2CH3OH + 3O2 --> 2CO2 + 4H2O
a)
yes
b)
no
20.
Which of the following equations are correctly balanced?
a)
12CO2 +H2O --> C6H12O6 + O2
b)
CO2 + 9H2O --> C6H12O6 + O2
c)
CO2 + H2O --> 3C6H12O6 + O2
d)
6CO2 + 6H2O --> C6H12O6 + 6O2
21.

Determined whether the following equation is balanced or unbalanced. Ag + O2 ---> 2Ag2O

a)

Balanced

b)

Unbalanced

22.

Determine whether the following equations is balanced or unbalanced. H4 + O2 ---> 2H2O

a)

Balanced

b)

Unbalanced

23.

Determine whether the following equation is balanced or unbalanced. 4P +5O2 ---> 2P2O5

a)

Balanced

b)

Unbalanced

24.

Determine whether the following equation is balanced or unbalanced. H2 + Br2 ---> 2HBr

a)

Balanced

b)

Unbalanced

25.

Determine whether the following equation is balanced or unbalanced. 2Fe + 3Cl2 ---> FeCl3

a)

Balanced

b)

Unbalanced

26.

Determine whether the following equations is balanced or unbalanced. S8 + O2 ---> 8SO3

a)

Balanced

b)

Unbalanced

27.

In order for an equation to be balanced, there must be ...

a)

an equal amount of atoms on both sides

b)

a greater mass on the product side

c)

a greater mass on the reactant side

d)

elements with the same atomic # on both sides

28.

Which coefficients would balance this chemical equation? _Fe2O3 ---> _Fe + _O2

a)

2,1,2

b)

2,4,3

c)

1,1,1

d)

1,3,2

29.

Which coefficients would balance this chemical equation? _K + _Cl2 ---> _KCl

a)

1,1,1

b)

1,2,2

c)

1,1,2

d)

2,1,2

30.

Which of the following equations is balanced?

a)

P4 + 3O2 ---> 2P2O3

b)

N4 + 3F2 ---> 2NF3

c)

2LiF + Br2 ---> 2LiBr + F4

31.
What precipitate forms when you mix lead (II) nitrate with sodium chloride?
a)
sodium nitrate 
b)
lead (II) chloride 
c)
sodium lead
d)
chloride nitrate 
32.
What precipitate forms when you mix lead (II) nitrate with sodium chloride?
a)
sodium nitrate 
b)
lead (II) chloride 
c)
sodium lead
d)
chloride nitrate 
33.
Which is the correct net ionic equation for the reaction of AgNO3 and CaCl2?
a)
Ca2+(aq) +  2Cl- (aq) → CaCl(s)
b)
Ag+(aq)  +  Cl- (aq) → AgCl(s)
c)
Ag +  Cl  →  AgCl
d)
Ag+  +  Ca2+   →Ag2Ca (s)
34.
Which of the following does NOT form a precipitate?
a)
Pb(NO3)2(aq) + 2KI(aq) →
b)
Sr(NO3)2 (aq) + K2SO4(aq) →
c)
AgNO3(aq) + Na2S(aq) →
d)
 Pb(NO3)2(aq) + AgNO3(aq) →
35.
What are the spectator ions in the reaction of sodium chloride with silver nitrate?
a)
silver and nitrate
b)
sodium and chloride
c)
sodium and nitrate
d)
silver and chloride
36.
In this equation,
CuCl2 + NaOH  → Cu(OH)2 + NaCl
Which product is insoluble?
a)
copper(II) hydroxide
b)
sodium chloride
c)
sodium hydroxide
d)
copper(II) chloride
37.
Which of these results in the formation of a precipitate?
a)
AgNO3(aq)  +  NaOH(aq)→
b)
BaNO3(aq)  +  CaCl2(aq)→
c)
NaNO3(aq)  +  KOH(aq)→
d)
More than one of these form precipitates
38.
Which of these results in formation of a precipitate?
a)
BaNO3(aq)  +  NaCl(aq)→
b)
KNO3(aq)  +  LiOH(aq)→
c)
Zn(NO3)2(aq)  +  NaOH(aq)→
d)
NaNO3(aq)  +  Ba(OH)2(aq)→
39.
What are the spectator ions in this reaction?
CuCl2(aq) + NaOH(aq) → Cu(OH)2(s) + NaCl(aq)
 
a)
Cu2+ and OH1-
b)
Na2+ and Cl2-
c)
Na1+ and Cl1-
d)
Na1+ and OH1-
40.
What is the result of the reaction between potassium bromide and ammonium sulfide?
a)
potassium sulfide precipitates
b)
ammonium bromide precipitates
c)
potassium ammonium precipitates
d)
no precipitate is formed
41.
What is the precipitate formed when you mix silver nitrate with copper chloride?
a)
copper nitrate
b)
copper chloride
c)
silver chloride
d)
silver nitrate
42.
Which is the correct net ionic equation for the reaction of AgNO3 and CaCl2?
a)
Ca2+(aq) +  2Cl- (aq) → CaCl(s)
b)
Ag+(aq)  +  Cl- (aq) → AgCl(s)
c)
Ag +  Cl  →  AgCl
d)
Ag+  +  Ca2+   →Ag2Ca (s)
43.
Which is the correct net ionic equation for the reaction of AgNO3 and CaCl2?
a)
Ca2+(aq) +  2Cl1- (aq) → CaCl(s)
b)
Ag+(aq)  +  Cl1- (aq) → AgCl(s)
c)
Ag +  Cl  →  AgCl
d)
Ag+  +  Ca2+   →Ag2Ca (s)
44.

Which of the following reactions does NOT have a net ionic equation?

a)

C9H20 + O2 --> CO2 + H2O

b)

AgNO3 + CaCl2 --> AgCl + Ca(NO3)2

c)

NH4I + PbOH --> NH4OH + PbI2

d)

Fe(NO3)2 + KOH --> KNO3 + FeOH

45.

Which of the following shows the correct net ionic equation for the reaction of Ba(MnO4)2(aq) + (NH4)2SO4?

a)

Ba2+ + SO42- --> BaSO4

b)

2NH4+ + 2MnO4- --> 2NH4MnO4

c)

Ba + MnO4- --> Ba(MnO4)2

d)

2MnO4- + SO42- --> BaSO4

46.

Which of the following shows the correct net ionic equation for Fe(NO3)2 + KOH

a)

Fe3+ + OH- --> Fe(OH)3

b)

Fe2+ + OH- --> Fe(OH)2

c)

2NO3- + 2K+ --> 2KNO3

d)

Fe2+ + 2OH- --> Fe(OH)2

47.

What is the precipitate in the net ionic equation of CuClO4 + ZnI2

a)

CuI

b)

Zn(ClO4)2

c)

ZnClO4

d)

CuI2

48.

In this equation,

CuCl2+ NaOH → Cu(OH)2 + NaCl

Which product is insoluble?

a)

copper(II) hydroxide

b)

sodium chloride

c)

sodium hydroxide

d)

copper(I) hydroxide

49.
What are the spectator ions in the reaction of sodium chloride with silver nitrate?
a)
silver and nitrate
b)
sodium and chloride
c)
sodium and nitrate
d)
silver and chloride
50.
What precipitate forms when you mix lead (II) nitrate with sodium chloride?
a)
sodium nitrate 
b)
lead (II) chloride 
c)
sodium lead
d)
chloride nitrate 
51.

Matter and mass can not be

a)

Shaken or stirred

b)

Made

c)

created or destroyed

d)

Transferred

52.

Which type of reaction has only one reactant?

a)

synthesis

b)

Double replacement

c)

Chemical reaction

d)

decomposition

53.

4Si + S8 --> 2Si2S4


What type of reaction is this?

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Double displacement

54.

3Mg + N2 --> Mg3N2


What type of reaction is this?

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

55.

What type of reaction is this?

P4 + 3O2 --> 2P2O3

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

56.
Which chemical reaction breaks down into 2 substances?
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
57.
A + B = AB
a)
Double Replacement
b)
Synthesis
c)
Combustion
d)
Decomposition
58.
AB + CD = AD + CB
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
59.
A + BC = B + AC
a)
Single Replacement
b)
Combustion
c)
Double Replacement
d)
Synthesis
60.
Which chemical reaction takes place when 2 substances react to form a single product?
a)
Decomposition
b)
Double Replacement
c)
Single Replacement
d)
Synthesis
61.
AB = A + B
a)
Decomposition
b)
Single Replacement
c)
Combustion
d)
Synthesis
62.
Fe + H2SO4 --> Fe2(SO4)3 + H2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
63.
What kind of reaction is this:
2H2 + O2 --> 2H2O
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
64.
What type of reaction occurs between an element and a compound?
Zn + 2HCl --> ZnCl2 + H2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
65.
The reaction below is an example of?
AgNO3 + NaCl → AgCl + NaNO3
a)
Single Replacement
b)
Double Replacement
c)
Decomposition
d)
Combustion
66.
What type of reaction is illustrated below?
2HI --> H2  +  I2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
67.

Which of the following general formulas represents a single-replacement reaction?

a)

AB → A + B

b)

A + B → AB

c)

A + BC → AC + B

d)

AB + CD → AD + CB

68.

The Law of Conservation of Mass states that the total mass of the reactants should be

a)

More than the mass of the products

b)

Equal to the mass of the products

c)

Ignored during the reaction

d)

Less than the mass of the products

69.

Which of the following reactions involves the ions of two compounds exchanging places to form two new compounds?

a)

Synthesis

b)

Double replacement

c)

Combustion

d)

Single Displacement

70.

When balancing equations, the rule is that you can only add, change, and remove ____________

a)

Coefficients

b)

Mass

c)

Subscripts

d)

Elements

71.

Balance this equation.

_CF4 + _Br2 -- _CBr4 + _F2

a)

2,1,2,1

b)

1,2,2,1

c)

1,2,1,2

d)

2,2,2,2

72.
What type of reaction is C3H8 + 5O2 => 3CO2 + 4H2O?
a)
combination
b)
decomposition
c)
combustion
d)
both combination and decomposition
73.
A chemical reaction in which a compound or element burns by reacting with oxygen is called a(n)
a)
combination reaction
b)
decomposition reaction
c)
combustion reaction
d)
carbonate decomposition reaction

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