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Unit 3 - Balancing, Identifying, & Predicting Equations

Total questions: 75

Worksheet time: 4hrs 51mins

Name
Class
Date
1.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

2.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

3.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

4.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

5.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

6.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

7.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

8.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

9.
PbCl2 + AgNO3 ---> Pb(NO3)2 + AgCl 
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
10.
NH3 + HCl ---> NH4Cl 
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
11.
Which chemical reaction switches 2 elements?
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
12.
Which chemical reaction takes place when 2 substances react to form a single product?
a)
Decomposition
b)
Double Replacement
c)
Single Replacement
d)
Synthesis
13.
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
14.
NH3 + HCl ---> NH4Cl 
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
15.
Balance this equation:
 __Li + __Cl2 -> __LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li +  Cl2 -> 2LiCl
16.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
17.
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
18.
Which of the following is the general formula for a decomposition reaction?
a)
A + B  → AB
b)
AB → A + B
c)
AB + C → AC + B
d)
AB + CD → AC + BD
19.
Which reaction type is the following: C5H10O4 + O2 --> CO2 + H2O
a)
Decomposition
b)
Single Replacement
c)
Combustion
d)
Double Replacement
20.
Fe + H2SO4 --> Fe2(SO4)3 + H2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
21.
4Si + S8 --> 2Si2S4
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Double displacement
22.
Predict the products for the following reactants.
C6H12 + O2 --> 
a)
CO + H2
b)
CO2 + O2
c)
C3H6O
d)
CO2 + H2O
23.
Predict the products for the following reactants.
Mg + I2 --> 
a)
MgI
b)
MgI2
c)
Mg + I2
d)
Mg2I
24.
Predict the products for the following reactants.
Na + MgCl2 -->
a)
NaCl + Mg
b)
NaCl2 + Mg
c)
No Reaction
d)
NaMgCl2
25.
Predict the products for the following reactants.
Al + O2 --> 
a)
AlO
b)
AlO2
c)
Al2O3
d)
Al2O
26.
Predict the products for the following reactants.
AgNO3 + Na2CO3 -->
a)
Ag2CO3 + NaNO3
b)
No Reaction
c)
AgCO3 + NO3Na
d)
AgCO3 + NaNO3
27.
Predict the products for the following reactants.

Al + CuCl2 -->
a)
No Reaction
b)
CuAl + Cl2
c)
Cu + AlCl3
d)
Cu2 + AlCl2
28.
Predict the products for the following reactants.

K2CO3 + BaCl2 -->
a)
No Reaction
b)
KCl + BaCO3
c)
K2Cl + BaCO3
d)
KCl2 + BaCO3
29.
Predict the products for the following reactants.
NaCl + CaBr2 -->
a)
NaBr + CaCl2
b)
NaBr2 + CaCl2
c)
No Reaction
d)
NaBr + Cl2Ca
30.
Predict the products for the following reactants.

K2CO3 + BaCl2 -->
a)
No Reaction
b)
KCl + BaCO3
c)
K2Cl + BaCO3
d)
KCl2 + BaCO3
31.
Predict the products for the following reactants.

Ag­2O -->
a)
Ag + O
b)
Ag + O2
c)
AgO
d)
Ag2 + O
32.
Write a complete balanced reaction for the following.
Liquid butane, C4H8, is burned in the presence of gaseous oxygen.
a)
C4H8 (l) + 6 O2 (g) --> 4 CO2 (g) + 4 H2O (g)
b)
C4H8 (l) + 12 O (g) --> 4 CO2 (g) + 4 H2O (g)
c)
C4H8 (l) + 12 O2 (g) --> 4 CO2 (g) + 4 H2O (g)
d)
C4H8 (l) + 5 O2 (g) --> 4 CO2 (g) +  O2 (g) + 4 H2 (g)
33.

What would the missing product be?


Au2S3 + 3 H2 ➔ 2 Au + ____________

a)

2 H3S

b)

2 AuH3

c)

3 H2S

34.

What would the missing product be?


CH4 + 2 O2 ➔ CO2 + ___________

a)

2 H2O

b)

4 HO

c)

CO2

35.

What is the missing product?


Na2CO3 + 2 AgNO3 ➔ 2 NaNO3 + __________

a)

2 Ag3Na

b)

2 AgCO3

c)

Ag2CO3

36.

What is the missing product?


2 NO2 ➔ O2 + _________

a)

N2

b)

N

c)

NO

37.

Li + Br2 -->

a)

LiBr2

b)

LiBr

c)

Li2Br

d)

Li7Br

38.

Ba + F -->

a)

BaF

b)

BaF2

c)

Ba7F2

d)

Ba2F

39.

lithium + oxygen -->

a)

LiO

b)

Li2O

c)

Li2O2

d)

LiO2

40.

Hydrogen combines with sulfur gas to create:

a)

HS

b)

H2S

c)

HS2

d)

H6S

41.

Hydrogen gas combines with chlorine gas to create:

a)

HCl

b)

H2Cl2

c)

H2Cl

d)

HCl2

42.
 Predict the product(s):  H2O -->
a)
H and O
b)
H2 and O2
c)
H and OH
43.

Predict the products for this substance: Al2O3 → ? + ?

a)

Al + O2

b)

O2 + Al3

c)

Al2 + O3

d)

Al + O

e)

Al3 + O

44.

Predict the product(s) of this reaction (don't worry about balancing):

Mg + HCl →

a)

No Reaction

b)

MgCl2 + H2

c)

MgCl2 + H

d)

MgCl + H2

45.

Based on the activity series, what are the predicted products of this reaction?

Br2 (l) + KI (aq) →

a)

KBr + I2

b)

Br2I + K

c)

KBr2 + I2

d)

No Reaction

46.
Predict the products for the this reaction:
K + HCl --> 
a)
KCl + H2
b)
KHCl 
c)
KH + Cl2
d)
KCl + H
47.

PCl5 + ___ H2O → ___ HCl + H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

48.

__ Al + __ FeO → Al2O2 + __ Fe

a)

1, 1, 2

b)

2,1,2

c)

2, 2, 2

d)

2,4,2

49.
 Mg  +  ___ HCl  →   MgCl2  +   H2
a)
1
b)
2
c)
3
d)
4
50.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
51.
Which side of a chemical equation os the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
52.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
53.
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1
54.
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
55.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
56.
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
57.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
58.
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
59.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
60.

The two sides of a chemical equation are called?

a)

Reactants (left) and Products (right)

b)

Ingredients (left) and Product (right)

c)

Cations and Anions

d)

Reactants (left) and Results (right)

61.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
62.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
63.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
64.
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. 
65.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
66.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
67.
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
68.
In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 
a)
4g
b)
5g
c)
9g
d)
14g
69.
The number to the lower side of an element is a 
a)
Subscript
b)
Superscript
c)
Coefficient
d)
Charge
70.

Which of the following are Subscripts in this Chemical Formula: 3Fe2O4

a)

3,4

b)

3,2

c)

2,4

d)

6

71.
The coefficient in  3H2O is
a)
6
b)
2
c)
3
d)
5
72.

The Coefficient (3) in the Chemical Formula, 3H2O, tells you how many _____________ there are.

a)

Atoms of Hydrogen

b)

Atoms of Oxygen

c)

Atoms of Water

d)

Molecules of Water

73.
How many nitrogen atoms does NH3 have?
a)
1
b)
2
c)
3
d)
4
74.

Which Chemical Equation is Balanced?

a)

CH₄+O₂------CO₂+2H₂O

b)

H₂+O₂-----2H₂O₄

c)

4Al+3O₂-----2Al₂O₃

75.
24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride
a)
62 
b)
38
c)
24
d)
14

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