Types of Chemical Reactions

Combination Reactions

In combination reactions two or more substances react to
form one product.

2Mg (s) + O2(g)→ 2MgO (s)

An easy way to think of this is:

A + B→AB

Combination Reactions Guided Practice

Which of the following chemical equations is an example of a
combination reaction?

Hint: There is only one right answer.

N2(g) + 3 H2(g)→ 2 NH3(g)

2NaN3(s)→ 2 Na (s) + 3 N2(g)

Correct!

A + B→AB

Real Life Examples of Combination Reactions

Where can we find combination reactions in everyday life?

Decomposition Reactions

In a decomposition reaction one substance breaks down into
two or more substances.

CaCO3(s)→ CaO (s) + CO2(g)

An easy way to think of this is:

AB→A + B

Decomposition Reactions Guided Practice

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

Hint: There is only one right answer.

C3H6(g) + Br2(l)→ C3H6Br2(l)

2KClO3(s)→ 2 KCl (s) + O2(g)
Correct!

AB→A + B

Real Life Examples of Decomposition Reactions

Where can we find decomposition reactions in everyday life?

Digestion is the “breaking down” of food
into smaller components.

Hydrogen peroxide, H2O2, decomposes
into water and Oxygen gas.

Combustion Reactions

Combustion reactions are generally rapid reactions that
produce a flame.

CH4(g) + 2 O2(g)→ CO2(g) + 2 H2O (g)

An easy way to remember this is:

Hydrocarbon + Oxygen→Carbon Dioxide + Water (g) + Heat

Combustion reactions most often involve hydrocarbons
reacting with oxygen in the air.

Hydrocarbons
consist of only
the elements
carbon (C)
and hydrogen
(H), such as
methane
(CH4)

Combustion Reactions Guided Practice

Which of the following chemical equations is an example of a
combustion reaction?

Hint: There is only one right answer.

C3H8(g) + 5 O2(g)→ 3 CO2(g) + 4 H2O (g)

Zn (s) + CuCl2(aq)→ ZnCl2(aq) + Cu (s)

Correct!

Hydrocarbon + Oxygen→Carbon Dioxide + Water (g) + Heat

Real Life Examples of Combustion Reactions

Where can we find combustion reactions in everyday life?

Single Replacement Reactions

A single replacementreaction occurs when one element
replaces another in a single compound.

Al(s) + 3 Ag2S(s)➝ Al2S3(s) + 6Ag(s)

An easy way to think of this is:

A + BC→AC+ B

Double Replacement Reactions

A double replacement reaction occurs when two ionic compounds
exchange ion and forms two new ionic compounds.

AgNO3(aq) + NaCl(aq)→ AgCl(s) + NaNO3(aq)

An easy way to think of this is:

AB + CD→AD+CB

Guided Practice

Which of the following chemical equations is a single replacement
reaction and which is a double replacement reaction?

1.

Mg(s) + CuCl2(aq)→ MgCl2(aq) + Cu(s)

2.

CaCO3(s) + 2HCl(aq) ➝ CaCl2(aq) + H2CO3(aq)

A + BC→AC+ B

AB + CD→AD+CB

Single replacement

Double replacement

Real Life Examples(acid-base neutralization)

Have you ever had a heartburn?

Mg(OH)2(s) + 2HCl(aq)→ MgCl2(aq) + 2H2O(l)

Base

(gives up OH-)

Acid

(gives up H+)

+

→
Salt
(Ionic

compound)

+ Water

Double replacement reaction

Summary

5 Types of Chemical Reactions:

1. Combination Reactions: A + B→AB

2. Decomposition Reactions: AB→A + B

3. Combustion Reactions: Hydrocarbon + O2→CO2 + H2O(g)+ heat

4. Single Replacement Reactions: A + BC→AC+ B

5. Double Replacement Reactions: AB + CD→AD+CB

Dropdown

Identify the type of chemical reaction

Select answer

Multiple Choice

Identify the type of chemical reaction

• Synthesis

• Decomposition

• Single replacement

• Double replacement

• Combustion

Multiple Choice

Identify the type of chemical reaction

• Synthesis

• Decomposition

• Single replacement

• Double replacement

• Combustion

Multiple Choice

Identify the following chemical reaction.

3 HBr + 1 Al(OH)₃ ----> 3 H­₂O + 1 AlBr₃

• Synthesis (or combination)

• Decomposition

• Single displacement

• Double displacement

Multiple Choice

This pictures simulates what type of reaction?

• Synthesis
• Decomposition
• Single Replacement
• Double Replacement

Multiple Choice

compound ---> element + element

• synthesis

• decomposition

• combustion

• single replacement

Multiple Choice

What type a reaction is taking place in this picture?

• Synthesis
• Decomposition
• Single Replacement
• Double Replacement

Multiple Choice

Identify the following chemical reaction.

Pb + FeSO₄ ----> PbSO₄ + Fe

• Synthesis (or combination)

• Decomposition

• Single displacement

• Double displacement

Multiple Choice

Identify the type of chemical reaction

• Synthesis

• Decomposition

• Single replacement

• Double replacement

• Combustion

Multiple Choice

Identify the type of chemical reaction

• Synthesis

• Decomposition

• Single replacement

• Double replacement

• Combustion

Multiple Choice

Identify the type of chemical reaction

• Synthesis

• Decomposition

• Single replacement

• Double replacement

• Combustion

Multiple Choice

Which of the following is an element?

• potassium chloride (KCl)

• water (H₂O)

• carbon (C)

• calcium carbonate (CaCO₃)

Multiple Choice

Identify the type of chemical reaction

• Synthesis

• Decomposition

• Single replacement

• Double replacement

• Combustion

Multiple Choice

Identify the type of chemical reaction

• Synthesis

• Decomposition

• Single replacement

• Double replacement

• Combustion

Multiple Choice

What is the general reaction scheme for a decomposition reaction?

• A + B --> AB

• AB --> A + B

• A + CD --> C + AD

• AB + CD --> CB + AD

• $$C_xH_y+O_2\ ->\ CO_2+H_2O$$

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