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Copy of Class Activity - Chemical Reactions and Reaction Types (5/28/2026)

Last updated about 2 hours ago

18 questions

Note from the author:

Instructions

Introduction to Chemical Reactions

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Class Practice

Independent Practice

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C.4.1 Describe, classify, and give examples of various kinds of reactions: synthesis (i.e., combination), decomposition, single displacement, double displacement, acid/base, and combustion.

Learning Goals:
I can describe the six types of reactions.
I can classify the six types of reactions.

C.4.1 Describe, classify, and give examples of various kinds of reactions: synthesis (i.e., combination), decomposition, single displacement, double displacement, acid/base, and combustion.

Learning Goals:
I can describe the six types of reactions.
I can classify the six types of reactions.

Chemical Reactions
Electrons and atoms rearrange.
Form new compounds and molecules.
Represented by equations that have two basic parts - reactants and products.
      Reactants → Products
Reactants - things that go into a reaction; they will be transformed.
Products - things that are the result of a reaction.

Chemical Reactions
Electrons and atoms rearrange.
Form new compounds and molecules.
Represented by equations that have two basic parts - reactants and products.
      Reactants → Products
Reactants - things that go into a reaction; they will be transformed.
Products - things that are the result of a reaction.

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Chemical Reactions
Electrons and atoms rearrange.
Form new compounds and molecules.
Represented by equations that have two basic parts - reactants and products.
      Reactants → Products
Reactants - things that go into a reaction; they will be transformed.
Products - things that are the result of a reaction.

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Energy and Chemical Reactions

Some chemical reactions also result in a change of energy.
Heat - some reactions can release or absorb this.
Light - emitted in some reactions; result of electrons gaining then releasing energy.

Five Reaction Types:
Combination (synthesis) Reactions
Decomposition Reactions
Combustion Reactions
Single Replacement Reactions
Double Replacement Reactions

Combination (Synthesis) Reactions
Two or more substances combine to form a single new compound.
      A + B → AB
Example: Formation of water from hydrogen and oxygen
     

Combination Reaction Examples

     2 Na + Cl2 → 2 NaCl
     2 Mg + O2 → 2 MgO
        S + 3 O2 → 2 SO3
     2 Fe + O2 → 2 FeO
     4 Fe + 3 O2 → 2 Fe2O3
         2 H2 + O2 → 2 H2O

Question 3

3.

Decomposition Reactions
A compound breaks down into two or more simpler substances.
      AB → A + B

Decomposition Reaction Examples

     2 HgO → 2 Hg + O2
        CaCO3 → CaO + CO2
     2 NaOH → Na2O + H2O
        H2CO3 → CO2 + H2O
     2 Ni2O3 → 4 Ni + 3 O2
        

Question 4

4.

Combustion Reactions
A substance reacts with oxygen gas, releasing heat and light.
Oxygen (O2) is always one of the reactants.
Water (H2O) is always one of the products.
Carbon dioxide (CO2) is often one of the products, but not always.

Combustion Reaction Examples

        C2H5OH + O2 → CO2 + H2O
        C3H8 + 5 O2 → 3 CO2 + 4 H2O
      2 H2 + O2 → 2 H2O
        C10H8 + 12 O2 → 10 CO2 + 4 H2O

Question 5

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Question 6

6.

Question 7

7.

Single-Replacement Reactions
Element replaces a similar element in a compound.
One reactant is an element.
The other reactant is a compound.
     A + BC → AC + B

Single-Replacement Reaction Examples

        Mg + Cu(NO3)2 → Mg(NO3)2 + Cu
        Zn + 2 HCl → ZnCl2 + H2
     2 Na + 2 H2O → 2 NaOH + H2 
       Cl2 + 2 NaBr → 2 NaCl + Br2 

Question 8

8.

Question 9

9.

Double-Replacement Reactions
The positive and negative ions of two ionic compounds exchange places to form two new compounds.
     AB + CD → AD + CB

Double-Replacement Reaction Examples

     2 KI + Pb(NO3)2 → 2 KNO3 + PbI2
        Na2S + 2 HCl → 2 NaCl + H2S
        HCl + NaOH → NaCl + H2O
        NaCN + HBr → NaBr + HCN  
        (NH4)2SO4 + Ba(NO3)2 → 2 NH4NO3 + BaSO4

Question 10

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Question 11

11.

Review

Chemical Reactions
Reactants → Products
Combination Reactions
A + B → AB
Decomposition Reactions
AB → A + B
Combustion Reactions
Oxygen is always a reactant.
Water is always a product.
Single-Replacement Reactions
A + BC → AC + B
Double-Replacement Reactions
AB + CD → AC + BD

Review

Combination Reactions
A + B → AB
Decomposition Reactions
AB → A + B
Combustion Reactions
Oxygen is always a reactant.
Water is always a product.
Single-Replacement Reactions
A + BC → AC + B
Double-Replacement Reactions
AB + CD → AC + BD

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Review

Combination Reactions
A + B → AB
Decomposition Reactions
AB → A + B
Combustion Reactions
Oxygen is always a reactant.
Water is always a product.
Single-Replacement Reactions
A + BC → AC + B
Double-Replacement Reactions
AB + CD → AC + BD

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Review

Combination Reactions
A + B → AB
Decomposition Reactions
AB → A + B
Combustion Reactions
Oxygen is always a reactant.
Water is always a product.
Single-Replacement Reactions
A + BC → AC + B
Double-Replacement Reactions
AB + CD → AC + BD

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Review

Combination Reactions
A + B → AB
Decomposition Reactions
AB → A + B
Combustion Reactions
Oxygen is always a reactant.
Water is always a product.
Single-Replacement Reactions
A + BC → AC + B
Double-Replacement Reactions
AB + CD → AC + BD

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Review

Combination Reactions
A + B → AB
Decomposition Reactions
AB → A + B
Combustion Reactions
Oxygen is always a reactant.
Water is always a product.
Single-Replacement Reactions
A + BC → AC + B
Double-Replacement Reactions
AB + CD → AC + BD

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Question 17

17.

Question 18

18.

Exit Ticket and Password
When complete do this exit ticket - https://app.formative.com/formatives/67c762c4248317f3a2863add
Password - Reactions

10 multiple-choice questions.
Timed - 5 minutes.
If you score below a 70% (below a 7/10) you can retake (no more than 4 total attempts).
Highest possible if using re-takes - 80%

Question 1

1.

Question 2

2.

Which of the following is a combination reaction (A + B → AB)?

CH4 + 2 O2 → CO2 + 2 H2O

Na2CO3 + 2HCl → 2NaCl + CO2 + H2O

8 Fe + S8 → 8 FeS

Zn + 2 HCl → ZnCl2 + H2

2 H2O → 2 H2 + O2

Which of the following is a decomposition reaction (AB → A + B)?

Na2CO3 + 2HCl → 2NaCl + CO2 + H2O

2 H2O → 2 H2 + O2

Zn + 2 HCl → ZnCl2 + H2

CH4 + 2 O2 → CO2 + 2 H2O

8 Fe + S8 → 8 FeS

What is a defining characteristic of combustion reactions?

They only produce solid products.

They do not require oxygen.

They release heat and light when a substance reacts with oxygen.

They always involve a single reactant.

Which of the following statements is true regarding combustion reactions (more than one correct answer)?

Oxygen (O2) is always a reactant.

Carbon dioxide (CO2) is sometimes a product.

Carbon dioxide (CO2) is never a product.

Oxygen (O2) is a product.

Water (H2O) is always a product.

Which of the following is a combustion reaction?

8 Fe + S8 → 8 FeS

CH4 + 2 O2 → CO2 + 2 H2O

2 H2O → 2 H2 + O2

Zn + 2 HCl → ZnCl2 + H2

Na2CO3 + 2HCl → 2NaCl + CO2 + H2O

What is true about single-replacement reactions (more than one correct answer)?

One reactant is an element.

One reactant is a compound.

They always produce two products.

An element replaces a similar element in a compound.

They do not involve any chemical changes.

Which of the following is a single-replacement reaction (A + BC → AC + B)?

CH4 + 2 O2 → CO2 + 2 H2O

Na2CO3 + 2HCl → 2NaCl + CO2 + H2O

8 Fe + S8 → 8 FeS

2 H2O → 2 H2 + O2

Zn + 2 HCl → ZnCl2 + H2

What is true about double-replacement reactions (more than one correct answer)?

They involve the exchange of positive and negative ions between two ionic compounds.

They involve the formation of only one new compound.

The general form of the reaction is AB + CD → AD + CB.

They always produce a gas as one of the products.

Two new compounds are formed as a result of the reaction.

Which of the following is a double-replacement reaction (AB + CD → AC + BD)?

Na2CO3 + 2HCl → 2NaCl + CO2 + H2O

2 H2O → 2 H2 + O2

Zn + 2 HCl → ZnCl2 + H2

8 Fe + S8 → 8 FeS

CH4 + 2 O2 → CO2 + 2 H2O

Question 12

12.

Is this a combination reaction, decomposition reaction, combustion reaction, single-replacement reaction, or a double-replacement reaction? Look to the left for help.

_______ HCl + Zn → H2 + ZnCl2

Question 13

13.

What kind of reaction is this?
_______ MgO → Mg + O2

Question 14

14.

What kind of reaction is this?
_______ C4H12 + O2 → CO2 + H2O

Question 15

15.

What kind of reaction is this?
_______ K3PO4 + BaCl2 → Ba3(PO4)2 + KCl

Question 16

16.

What kind of reaction is this?
_______ Fe + O2 → Fe2O3

Combination Reactions
A + B → AB
Decomposition Reactions
AB → A + B
Combustion Reactions
Oxygen is always a reactant (left of arrow).
Water is always a product (right of arrow).
Single-Replacement Reactions
A + BC → AC + B
Double-Replacement Reactions
AB + CD → AC + BD
Identify each of these reactions (combination, decomposition, combustion, single-replacement, double-replacement).

a.) _______  3 NaBr + H3PO4 → Na3PO4 + 3 HBr

b.) _______ C2H4 + 3 O2 → 2 CO2 + 2 H2O

c.) _______ 3 Mg + Fe2O3 → 2 Fe + 3 MgO

d.) _______ 3 Ca(OH)2 + Al2(SO4)3 → 3 CaSO4 + 2 Al(OH)3 

e.) _______ H2O + SO3 → H2SO4

f.) _______ 2 PbSO4 → 2 PbSO3 + O2

g.) _______ 2 NH3 + 3 I2 → N2I6 + 3 H2

h.) _______ H2SO4 + 2 NH4OH → 2 H2O + (NH4)2SO4

i.) _______  Al2S3 → Al + S8

j.) _______ C4H12 + O2 → CO2 + H2O

Identify each of these reactions (combination, decomposition, combustion, single-replacement, double-replacement).

a.) _______   Pb + FeSO4 → PbSO4 + Fe

b.) _______   CaCO3 → CaO + CO2

c.) _______    P4 + 3 O2 → 2 P2O3 

d.) _______   2 RbNO3 + BeF2 → Be(NO3)2 + 2 RbF

e.) _______   2 AgNO3 + Cu → Cu(NO3)2 + 2 Ag

f.) _______    2 C5H5 + Fe → Fe(C5H5)2  

g.) _______   SeCl6 + O2 → SeO2 + 3 Cl2  

h.) _______   C4H9OH + 6 O2 → 4 CO2 + 5 H2O

i.) _______     4 K + O2 → 2 K2O

j.) _______   2 H2 + O2 → 2 H2O

What are reactants in a chemical reaction?

Substances that are formed as a result of the reaction

The final state of the reaction

The energy released during the reaction

Substances that undergo transformation to form new compounds

In a chemical reaction represented by the equation Reactants → Products, which statement is true?

Reactants are transformed into products during the reaction.

Reactants are the final outcome of the reaction.

Products are the starting materials for the reaction.

Products can only be gases.