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Types of chemical Reactions and Balancing

Total questions: 40

Worksheet time: 53mins

Name
Class
Date
1.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
2.
Identify this type of reaction,
Cl2 + 2KI -->  I2 + 2KCl
a)
Synthesis
b)
Single Replacement
c)
Double Replacement
d)
Decomposition
3.
Which chemical reaction forms Carbon Dioxide and Water?
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
4.
Which reaction type is the following: AgF + CaCl2 --> AgCl + CaF2
a)
Decomposition
b)
Single Replacement
c)
Synthesis
d)
Double Replacement
5.
Which reaction type is the following:  Na + CaF2 --> Ca + NaF
a)
Decomposition
b)
Single Replacement
c)
Synthesis
d)
Double Replacement
6.

Balance this reaction:

____ Na3PO4 + ____ KOH ---> ____ NaOH + ____ K3PO4

a)

1,3,3,1

b)

1,3,2,1

c)

2,3,3,1

d)

1,1,3,1

7.

Balancing this reaction:

____ CH4 + ____ O2 ---> ___ CO2 + ____ H2O

a)

2,1,3,1

b)

1,2,1,2

c)

1,2,2,1

d)

2,1,1,2

8.

Balance this reaction:

____ NaF + ____ Br2 ---> ___ NaBr + ____ F2

a)

3,1,2,1

b)

1,2,3,4

c)

2,1,2,1

d)

1,2,1,2

9.

Balance this reaction:

____ RbNO3 + ____ BeF2 ----> ____ Be(NO3)2 + ____ RbF

a)

1,1,1,1

b)

1,2,1,1

c)

2,1,1,2

d)

2,1,2,1

10.

What do the coefficients need to be in the following equation in order to be balanced?

_Al +_HCl → _H2 +_AlCl3

a)

2, 6, 3, 2

b)

it is already balanced

c)

4, 12, 3, 4

d)

2, 1, 4, 5

11.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
12.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
13.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
14.
In a chemical reaction, everything to the rightof the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
15.

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

16.
Which is the name of the kind of solid substance formed in this figure?  
a)
aqueous 
b)
precipitate
c)
acid
d)
synthesis 
17.

C2​H6​ + 5O2​ → 2CO2​ + 3H2​O2​  Given this chemical equation, what are the REACTANTS?

a)

 C2H6 and 5O2

b)

2CO2​ and 3H2​O2​

18.

How many Oxygen (O) atoms are in 2C2HO8Cl2

a)

2

b)

8

c)

16

d)

5

19.

Which is the Law of Conservation of Matter?

a)

matter cannot be created or destroyed, it only changes form

b)

matter can be destroyed but it cannot be created, it usually just changes form

c)

matter can be created but it cannot be destroyed, it never changes form

d)

matter is an unproven theory created by Hans Geiger

20.

Observe the reaction shown here. The formula for this equation is  N2​ + H2​ → NH3​ . Does this represent a balanced equation that obeys the Law of Conservation of Mass?

a)

No. The reactants and products are not equal in numbers of atoms of each element. 

b)

Yes. The reactants and products are equal in numbers of atoms of each element. 

21.

To balance an equation you should:

a)

ONLY change subscripts.

b)

ONLY change coefficients.

c)

Change BOTH subscripts and coefficients.

22.

The coefficient in 3 H2O is

a)

3

b)

2

c)

H

d)

O

23.

C2​H6​ + 5O2​ → 2CO2​ + 3H2​O2​  

Given this chemical equation, what are the PRODUCTS?

a)

C2​H6 ​and 5O2​

b)

2CO2​ and 3H2​O2​

24.

Sodium reacts with chlorine gas to produce sodium chloride.

Which is the unbalanced equation for the reaction above?

a)

NaCl→ Cl + Na

b)

Na + Cl2→ NaCl

c)

Na+ CO2 → NaCO2

d)

Na + Cl → NaCl

25.

Identify the reactant(s) and product(s) of the reaction.

a)

All three are reactants and none are products.

b)

Water and oxygen are the reactants, and hydrogen is the product.

c)

Hydrogen and water are the reactants, and oxygen is the product.

d)

Hydrogen and oxygen are the reactants, and water is the product.

26.

How many Hydrogen (H) atoms are in NH3O5

a)

3

b)

5

c)

4

d)

1

27.

What coefficient should go in the blank space to balance the chemical equation? 2Al  +____  HCl   →    2AlCl3  +  3H2

a)

2

b)

3

c)

4

d)

6

28.

Complete the sentence.

During a chemical reaction, atoms ________.

a)

can appear

b)

get rearranged

c)

can disappear

d)

stop moving and vibrating

29.

What is the role of the arrow sign in a chemical reaction?

a)

Making sure atom counts on each side are the same.

b)

Showing which substances were in the container first and which substances were added later.

c)

Separating products and reactants.

d)

Showing which substances are solids and which are liquids or gases.

30.

How many Mn atoms are found in the reactants of the following equation as indicated by the coefficients?

3 Cr(MnO4)6 + 6 Na3N ----> ______________

a)

3

b)

6

c)

4

d)

18

31.

Is the following equation balanced?...Al + O2 --> 2Al2O3

a)

yes

b)

no

32.

Which of the following shows the correct way to balance the chemical equation? Fe + O2 -> Fe2O3

a)

4Fe + 3O2 -> 2Fe2O3

b)

4 Fe + O6 -> 2Fe2O3

c)

2 Fe + 3O2 -> Fe2O6

d)

None of the options are correctly balanced.

33.

__ Al + __ FeO → Al2O2 + __ Fe

a)

1, 1, 2,2

b)

2, 2, 1, 2

c)

2,1,2,2

d)

2,4,2,2

34.

What is the little number after an element in a chemical equation called. Example: H2

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

35.

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 gained in a chemical reaction.

c)

Matter can only be lost in a chemical reaction.

d)

Matter can be gained and lost in a chemical reaction. 

36.

2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH

a)

Synthesis (or combination)

b)

Single displacement

c)

Decomposition

d)

Double displacement

37.

Na3PO4 + 3 KOH ----> 3 NaOH + K3PO4

a)

Synthesis (or combination)

b)

Single displacement

c)

Decomposition

d)

Double displacement

38.

 CaCO3 ----> CaO + CO2

a)

Synthesis (or combination)

b)

Single displacement

c)

Decomposition

d)

Double displacement

39.

P4 +  3 O2 ----> 2 P2O3

a)

Synthesis (or combination)

b)

Single displacement

c)

Decomposition

d)

Double displacement

40.

SeCl6 + O2 ----> SeO2 + 3Cl2

a)

Synthesis

b)

Single displacement

c)

decomposition

d)

double displacement

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