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Unit 9 Review: Chemical Reactions

Total questions: 70

Worksheet time: 2hrs 27mins

Name
Class
Date
1.
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
Synthesis
b)
Decomposition
c)
Single diplacement
d)
Double displacement
2.
3KOH + H3PO4 --> K3PO4 + 3H2O
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Double displacement
3.
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
4.
Which reaction type is the following: C5H10O4 + O2 --> CO2 + H2O
a)
Decomposition
b)
Single Replacement
c)
Combustion
d)
Double Replacement
5.
Balance this equation:
 __Li + __Cl2 -> __LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li +  Cl2 -> 2LiCl
6.
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
7.
The number of atoms you begin with in a chemical reaction ...
a)
must be the same as the number of  atoms you end with
b)
must be an even number
c)
can be different to the number you finish with
d)
changes depending on how much energy is formed
8.

Balancing the following:

____ Al + ____ HCl → ____ AlCl3 + ____ H2

a)
1,3,1,2
b)
2,3,2,3
c)
2,6,2,3
d)
3,2,6,2
9.
Balance the following: Fluorine and Aluminum oxide react to produce Aluminum fluoride and Oxygen
a)
6,2,4,3
b)
3,4,2,6
c)
5,1,3,2
d)
3,2,4,3
10.
Based on the activity series, will this reaction occur?
Br2 (l) + KI (aq) →
a)
Yes
b)
No
11.

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

Mg + HCl →

a)

MgHCl

b)

MgCl2 + H2

c)

MgCl2 + H

d)

MgCl + H2

12.
Predict the product(s) of this reaction (don't worry about balancing):
C12H22O11 + O2 →
a)
CO + HO
b)
CO2
c)
CO2 + H2O
d)
H2O
13.
Predict the product(s) of this reaction (Don't worry about balancing) 
Pb(NO3)2  +  KI →
a)
PbK +  I NO3
b)
not possible
c)
PbI2  +  KNO3
d)
PbI  + KNO3
14.
Predict the products for the following reactants.
Al + O2 --> 
a)
AlO
b)
AlO2
c)
Al2O3
d)
Al2O
15.

What does (aq) mean in a chemical equation?

a)

Aqueous-- a solid powder dissolved in water

b)

Aqueous-- a naturally occurring liquid

c)

Aquinas-- solid at room temperature

d)

Aquinas-- A catholic priest and Doctor of the Church

16.

What is the correct name for the compound Na3N

a)

Trisodium mononitride

b)

Trisodium mononitrogen

c)

Sodium nitrogen

d)

Sodium nitride

17.

What type of bond forms between Al and N?

a)

Ionic-- 2 nonmetals

b)

Covalent-- 2 nonmetals

c)

Ionic-- a metal and a nonmetal

d)

Covalent-- a metal and a nonmetal

18.

Which list of coefficients will balance the equation:

_ SiCl4 → _ Si + _ Cl2

a)

1,1,1

b)

1,1,2

c)

2,2,2

d)

1,2,1

19.

What are the substances on the left side of the arrow that are about to react called?

a)

Reactions

b)

Reactants

c)

Products

d)

Ingredients

20.

Which list of coefficients will balance the equation:

__CO + __ O2 → __ CO2

a)

1,2,1

b)

2,1,2

c)

2,2,2

d)

1,1,1

21.

What type of reaction is shown?

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

22.

What are the reactants in the following chemical equation?

a)

Iron + Oxygen

b)

Rust

c)

Iron

d)

Oxygen

23.

What type of reaction is shown?

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

e)

Synthesis Combustion

24.

How many atoms of hydrogen are in 1 unit of Mg(C2H3O2)2

a)

3

b)

5

c)

6

d)

9

25.

What scientific principle is demonstrated with this experiment?

a)

Law of Conservation of Energy

b)

Law of Conservation of Matter/Mass

c)

Coulomb's Law

d)

Law of Horizontal Superposition

26.

What type of reaction is shown?

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

27.

What are the new substances on the right of the arrow that are produced by a reaction called?

a)

Reactants

b)

Products

c)

Ingredients

d)

Reactions

28.

Which is the name of the solid substance formed from 2 aqueous solutions in a double displacement reaction, as seen in this image?

a)

aqueous

b)

precipitate

c)

acid

d)

synthesis

29.
An element plus additional element reacts to form one product is an example of which type of chemical reaction? 
a)
combustion
b)
decomposition 
c)
synthesis 
d)
single replacement
30.
Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas this happens because? 
a)
Magnesium is higher on the reactivity series then hydrogen
b)
magnesium is more reactive than hydrogen
c)
magnesium is able to break the bond between HCl and form MgCl2
d)
both b and c are correct
31.
Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?
a)
double replacement 
b)
decomposition 
c)
combustion 
d)
single replacement
32.
Provides evidence that a chemical reaction has occurred. 
a)
dissolving 
b)
melting
c)
formation of a gas
d)
bending
33.
What type of chemical reaction takes place when fluorine reacts with sodium bromide?
a)
single replacement 
b)
double replacement 
c)
combustion
d)
synthesis 
34.
A compound is reacted and forms two new substances. What type of reaction is this? 
a)
combustion 
b)
synthesis 
c)
decomposition 
d)
single replacement 
35.
Describes the number of atoms in a compound of each element. 
a)
coefficient 
b)
superscript 
c)
subscript 
d)
SI unit 
36.
What are the correct coefficients when this equation is balanced?
KClO3  --> KCl  +  O2
a)
2,2,2
b)
2,2,3
c)
1,2,3
d)
3,3,3
37.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
38.
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. 
39.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
40.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
41.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
42.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
43.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
44.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
45.
Balance this equation...
HgO --> Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
46.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
47.
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
48.

If an element is diatomic it should have a subscript of___

a)

1, always

b)

2, only when it is an element

c)

it shouldn't have a subscript, it should have a coefficent

d)

2, when bonded in a compound

49.

The symbol for a substance dissolved in solution is ______

a)

(s)

b)

(l)

c)

(aq)

d)

(g)

50.

Fill in the blank. (Copper has a charge of 2+)

Cu+ AgNO3 → Ag + _____

a)

Cu(NO3)2

b)

CuNO3

c)

CuAg

d)

Cu

51.

Predict the products of this synthesis reaction: H2 + Cl2 →

a)

HCl

b)

H2Cl2

c)

H2Cl

d)

HCl2

52.

Predict the products for the this Single Replacement reaction:

K + HCl →

a)

KCl + H2

b)

KHCl

c)

KH + Cl2

d)

HCl + K2

53.

Predict the products for the this Double Replacement reaction:

AgNO3 + KCl →

a)

AgCl + KNO3

b)

AgK + ClNO3

c)

KAg + NO3Cl

d)

AgCl + 3 KNO

54.

Complete the balanced equation for this Double Replacement reaction.

3 NaOH + Fe(NO3)3 →

a)

NaFe + OH(NO3)3

b)

NaNO3 + Fe(OH)3

c)

3 NaNO3 + Fe(OH)3

d)

3 NaFe + 3 (OH)NO3

55.

Predict the product of this synthesis reaction:

Al + S₈ →

a)

AlS

b)

AlS8

c)

Al2S

d)

Al2S3

56.

Predict the products for the decomposition of aluminum oxide, Al2O3 →

a)

Al + O2

b)

O + Al2

c)

Al2 + O3

d)

Al + O

57.

Predict the products for the this Single Replacement reaction: (Copper has a charge of 1+)

Mg + CuCl →

a)

MgCl2 + Cu

b)

Mg + Cu

c)

MgCu + Cl2

d)

MgCl + Cu2

58.

What are the products of this reaction:

C2H4 + O2 →

a)

C2O2 + H4

b)

CO2 + H2 + O2

c)

CO + H

d)

CO2 + H2O

59.

What is the correct way of representing hydrogen gas alone, in a reaction?

a)

2H

b)

H

c)

H2

60.

What is the charge of Iron in this compound. (Hint: think criss cross method):

Fe3(PO4)2

a)

+3

b)

+2

c)

+1

61.

Magnesium can be burned in oxygen to produce solid magnesium oxide.

a)

Mg + O2→ MgO

b)

Mg+ O→ MgO

c)

Mg + CO2 → MgO + C

d)

Mg + O2→ Mg2O2

62.

Sodium reacts with chlorine gas to produce sodium chloride.

a)

NaCl→ Cl + Na

b)

Na+ CO2 → NaCO2

c)

Na + Cl2→ NaCl

d)

Na + Cl → NaCl

63.

Iron reacts with solid sulfur to produce iron(II) sulfide powder.

a)

Fe + S → Fe2S

b)

Fe + S → FeS

c)

Fe2 + S→ Fe2S2

d)

Fe + S2 → Fe2S

64.

When lead reacts with oxygen, a yellow lead(II) oxide powder is produced.

a)

Pb + O2 → PbO

b)

Pb + O2→ PbO2

c)

Pb2 + O2→ Pb2O

d)

Pb + O → PbO

65.

When hydrogen reacts with sulfur, a smelly gas, dihydrogen monosulfide, is produced.

a)

H2 + S → HS

b)

H2 + S → H2S

c)

H + S→ HS

d)

H + S→ H2S

66.

Hydrogen gas and nitrogen monoxide gas forms water and nitrogen gas.

a)

H2 + NO --> H2O + N2

b)

H + NO --> H2O + N

c)

H2 + N2O3 --> H2O + N2

d)

H + NO --> H2O + N2

67.

sodium phosphate and calcium chloride produce calcium phosphate and sodium chloride

a)

Na3PO4 + CaCl2 --> Ca3(PO4)2 + NaCl

b)

Na3PO4 + CaCl2 --> Ca4PO2 + NaCl

c)

NaPO4 + CaCl2 --> Ca(PO4)2 + NaCl

d)

NaPO4 + CaCl2 --> Ca2(PO4)3 + NaCl

68.

Aluminum bromide and chlorine gas produce aluminum chloride and bromine gas.

a)

AlBr3 + Cl2 --> AlCl3 + Br2

b)

AlBr3 + Cl --> AlCl3 + Br

c)

Al3Br + Cl --> Al3Cl + Br2

d)

AlBr3 + Cl2 --> AlCl3 + Br

69.

Calcium oxide and water produces calcium hydroxide

a)

CaO + H2O --> Ca(OH)2

b)

Ca2O2 + H2O --> Ca(OH)2

c)

CaO + H2O --> CaOH

d)

Ca2O2 + H2O --> Ca(OH)2

70.

Copper and silver sulfate produces copper (II) sulfate and silver

a)

Cu + Ag2SO4 --> CuSO4 + Ag

b)

Cu2 + Ag2SO4 --> CuSO4 + Ag

c)

Cu + Ag2S --> CuS + Ag

d)

Cu2 + AgSO4 --> CuSO4 + Ag2

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