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Identifying and Balancing Chemical equations

Total questions: 59

Worksheet time: 1hrs 16mins

Name
Class
Date
1.

Balance the following:

____ Fe + ____ Cl2 → ____ FeCl3

a)
1,1,2
b)
1,3,1
c)
2,2,3
d)
2,3,2
2.

Which type of reaction is:

C7H16 + 10 O2 → 7 CO2 + 8 H2O

a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
3.

Which type of reaction is:

3 Pb + 2 H3PO4 → 3 H2 + Pb3(PO4)2

a)
Synthesis
b)
Single Displacement
c)
Double Displacement
d)
Combustion
4.

In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?

a)

Mg and O2

b)

MgO

c)

Mg and MgO

d)

O and MgO

5.

The blue numbers in the image represent

a)

subscripts

b)

coeffiecients

c)

roman numerals

d)

none of the answer options are correct

6.

The red numbers in the image represent

a)

subscripts

b)

coeffiecients

c)

roman numerals

d)

none of the answer options are correct

7.

When balancing a chemical equation, you can only change _________, you can never change _______!

a)

coefficients, subscripts

b)

subscripts, coefficients

c)

formulas, subscripts

d)

coefficients, formula units

8.
The following reaction is an example of what reaction type? 
CoCO3 → CoO + CO2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
9.
Si + S8 --> Si2S4
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
10.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
11.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
12.
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
13.

Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe

a)

yes

b)

no

14.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
15.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
16.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
17.
N2 + H2 = NH4
a)
Balanced
b)
Unbalanced
18.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__H2 + __S --> __H2S
a)
1,1 --> 1
b)
2,2 --> 2
c)
1,2 --> 1
d)
1,2 --> 2
19.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Al + __O2--> __Al2O3
a)
4,1 --> 2
b)
4,3 --> 4
c)
3,4 --> 1
d)
4,3 --> 2
20.

Si + S8 →Si2S4

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

21.

Pb(NO3)2 →PbO + NO2 + O2

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Combustion

22.
AB + CD →AD + CB
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
23.

Cu + 2Ag(NO3) → 2Ag + Cu(NO3)

a)

Synthesis Reaction

b)

Decomposition Reaction

c)

Single Replacement Reaction

d)

Double Replacement Reaction

24.
Always starts with a hydrocarbon that reacts with oxygen and produces carbon dioxide and water. 
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
25.

what is a reactant?

a)

a volatile chemical

b)

a dangerous substance

c)

the substance(s) you start with in a chemical reaction

d)

the substance(s) you end with in a chemical reaction

26.

When the equation is balanced what are the correct coefficients?



a)

1, 1, 2

b)

 1, 3, 1

c)

2, 2, 3

d)

2, 3, 2

27.

What are the correct coefficients when the equation is balanced?

a)

2, 3, 4

b)

4, 3, 2

c)

1, 1, 2

d)

2, 1, 1

28.

Which of the following is an example of a synthesis reaction?

a)
b)
c)
d)
29.

Which of the following is an example of a decomposition reaction?

a)
b)
c)
d)
30.

Which of the following is an example of a single replacement reaction?

a)

b)

c)

Ca + CuCl2---> CaCl2 + Cu

d)

31.

Which of the following is an example of a double replacement reaction?

a)
b)
c)
d)
32.

When balanced, the correct coefficients for the equation are:

a)

1, 3, 3, 1

b)

1, 3, 2, 1

c)

2, 3, 3, 1

d)

1, 1, 3, 1

33.

When balanced, the correct coefficients for the equation are:

a)

3, 1, 2, 1

b)

1, 2, 3, 4

c)

2, 1, 2, 1

d)

1, 2, 1, 1

34.

When balanced, the correct coefficients for the reaction are:

a)

1, 1, 1, 1

b)

1, 2, 1, 1

c)

2, 1, 1, 2

d)

2, 1, 2, 1

35.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
36.
The following is what type of reaction:
PbCl2 + AgNO3 → Pb(NO3)2 + AgCl
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
37.
The following is what type of reaction:
NH3 + HCl  → NH4Cl
a)
Synthesis
b)
Decomposition
c)
Single Replacement Replacement
d)
Double Replacement Replacement
38.
C4H12 + O2 → CO2 + H2O
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
39.

Match the following

a)
1.

combustion

b)
2.

synthesis

c)
3.

decomposition

d)
4.

single replacement

e)
5.

double replacement

40.

Match the following

a)

1 reactant breaks apart into 2 or more smaller products

1.

decomposition

b)

2 or more reactants combine to make 1 product

2.

synthesis

c)

O2 as a reactant & CO2 and water as products

3.

combustion

d)

1 element & 1 compound in products & reactants

4.

single replacement

e)

2 compounds in reactants & products

5.

double replacement

41.

Put the equations in this order: decomposition, synthesis, combustion, single replacement, double replacement.

a)
b)
c)
d)
e)
1)
2)
3)
4)
5)
42.

How many Mn atoms are found in the following compound?

2MnO4

a)

1

b)

2

c)

4

d)

8

43.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
44.

What are the coefficients that would properly balance this equation?

__Ca + __H2O --> __Ca(OH)2 + __H2

a)

2,1 --> 2,1

b)

1,2 --> 1,1

c)

1,2 --> 2,4

d)

1,2 --> 2,1

45.

Which is the correct chemical equation for the following: Barium Chloride combined with sodium sulfide yields barium sulfide and sodium chloride

a)

BaCl + NaS → BaS+ NaCl

b)

BaCl2 + Na2S → BaS+ NaCl

c)

BaS+ NaCl → BaCl + NaS

d)

BaCl2 + Na2S → BaS+ NaCl2

46.

Which is the correct chemical equation for the following: Solid Zn reacts with silver (I) chloride to produce Zinc (II) chloride and silver metal

a)

Zn + AgCl → ZnCl2 + Ag

b)

ZnCl2 + Ag → Zn + AgCl

c)

ZnCl2 + Ag2 → Zn + AgCl

d)

Zn2Cl + Ag → Zn + AgCl

47.

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

48.

Match the symbol to the correct word.

a)

g

1.

Gas

b)

aq

2.

Aqueous

c)

s

3.

Solid

d)

l

4.

Liquid

e)

→

5.

Yields

49.

In a chemical equation "aq" means ​ (a)   . This word means "dissolved in water". The compound or element has been put into water to form a solution ​or homogenous mixture. "l" means ​ (b)   . this means the compound or element is in the liquid phase. It has not been mixed with anything else. The arrow in a chemical equation means ​ (c)   . On the left side of the arrow are the ​ (d)   , and on the right side of the arrow are the ​​ (e)   .

Choose from the below words
Aqueous
liquid
yields
reactants
products
50.

"When heated, solid mercury(II) oxide decomposes into mercury liquid and oxygen gas." What is the correct skelton equation for this reaction?

a)

Hg (l) + O2 (g) --> Hg2O (s)

b)

Hg2O (s) --> Hg (l) + O (g)

c)

HgO (s) --> Hg (l) + O2 (g)

51.

Translate the word equation below:

Nitrogen reacts with Hydrogen to form Ammonia (NH3).

a)

N  → H + NH3N\ \ \rightarrow\ H\ +\ NH_3

b)

N2 + H2 → NH3N_2\ +\ H_2\ \rightarrow\ NH_3

c)

N + H → NH3N\ +\ H\ \rightarrow\ NH_3

d)

N2 → H2 + NH3N_2\ \rightarrow\ H_2\ +\ NH_3

52.

Translate the word equation below.

Hydrogen and Carbon Dioxide react to form Carbonic Acid (H2CO3).

a)

H + CO2 → H2CO3H\ +\ CO_2\ \rightarrow\ H_2CO_3

b)

H → CO2 + H2CO3H\ \rightarrow\ CO_2\ +\ H_2CO_{3_{ }}

c)

H2 + CO2 → H2CO3H_2\ +\ CO_2\ \rightarrow\ H_2CO_3

d)

H2 → CO2 + H2CO3H_2\ \rightarrow\ CO_2\ +\ H_2CO_3

53.

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

a)

Mg(s) + O2(g)→ MgO(s)

b)

Mg(s) + O(g) → MgO(s)

c)

Mg(s) + CO2(g) → MgO(s) + C(s)

d)

Mg(s) + O2(g) → Mg2O2(s)

54.

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

Br2 (l) + KI (aq) →

a)

KBr + I2

b)

KBr + I

c)

KBr2 + I

d)

No Reaction

55.

What will be the result of the following:

LiBr + Na --->

a)

Li will replace Na

b)

Na will replace Br

c)

Na will replace Li

d)

no reaction will occur

56.

What will be the result of : Zn + AuCl2->

a)

ZnCl2 +Au

b)

ZnAu + Cl2

c)

no reaction

d)

ClAu + Zn

57.

What are the products of this reaction: Fe + Na2CO3 ?

a)

Na2 + Fe(CO3)2

b)

Na + CO3Fe

c)

Na + Fe2CO3

d)

No Reaction

58.

What are the products of this single replacement reaction: Mg + CuSO4

a)

Cu + MgSO4

b)

Cu + SO4Mg

c)

Cu + Mg(SO4)2

d)

No Reaction

59.
Based on the activity series, which metal could X represent in the reaction below?
X + Ca (NO3)2 -->  Ca + X (NO3)2
a)
Ba
b)
Fe
c)
Mg
d)
Zn

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