Types of Chemical Reactions
Presentation
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Science
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6th Grade
•
Practice Problem
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Medium
Standards-aligned
Barbara White
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10 Slides • 10 Questions
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Types of Chemical Reactions
Middle School
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Learning Objectives
Define the five main types of chemical reactions.
Identify a reaction by analyzing its reactants and products.
Write and balance chemical equations for each type of reaction.
Recognize the general patterns for reactions, like A + B → AB.
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Key Vocabulary
Combination Reaction
A reaction where two or more simple substances combine to form a more complex product.
Decomposition Reaction
A reaction where a complex substance breaks down into two or more simpler substances.
Single Replacement
A reaction where an element trades places with another element in a compound.
Double Replacement
A reaction where two compounds react, and the positive and negative ions switch places.
Combustion Reaction
A reaction where a substance rapidly combines with an oxidant, usually oxygen, to produce heat and light.
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What Is a Combination Reaction?
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Multiple Choice
Based on the general formula A + B → AB, which of the following is a combination reaction?
BaCl2 + Na2SO4 → NaCl + BaSO4
Cl2 + NaBr → NaCl + Br2
Mg + O2 → MgO
HgO → Hg + O2
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What Are Decomposition Reactions?
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Multiple Choice
Which of the following equations represents a decomposition reaction?
Al2O3 → Al + O2
P + O → P4O10
H2 + N2 → NH3
C10H8 + 12O2 → 10CO2 + 4H2O
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Single Replacement Reactions
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Multiple Choice
What are the products in a single replacement reaction represented by the general formula A+BC→AC+B ?
A new compound AC and element B
Two new compounds, AC and AB
A new compound CB and element A
A new compound AB and element C
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Double Replacement Reactions
Two compounds react by swapping their positive and negative ions.
The general formula is AB + CD → AD + BC.
For example, BaCl2 reacts with Na2SO4 to form new products.
This forms NaCl and a solid precipitate called BaSO4.
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Multiple Choice
In a double replacement reaction with reactants BaCl2 and Na2SO4, what happens to the ions?
The Na+ ion bonds with the SO42- ion.
No ions are exchanged.
The Ba2+ ion bonds with the Cl- ion.
The Ba2+ ion from BaCl2 bonds with the SO42- ion from Na2SO4.
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Combustion Reactions
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Multiple Choice
What are the constant products of a complete combustion reaction of a hydrocarbon (CxHy)?
Carbon and Hydrogen
Carbon Monoxide and Water
Oxygen and a hydrocarbon
Carbon Dioxide and Water
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Common Misconceptions About Chemical Reactions
Misconception | Correction |
|---|---|
All reactions with oxygen are combustion. | Oxygen is also in other reactions, like combination (Mg + O2). |
Single and double replacement reactions are the same. | Single replacement: one element swaps. Double replacement: two compounds swap parts. |
In decomposition, substances just disappear. | Substances break down into simpler new ones, and mass is conserved. |
The products of a chemical reaction are random. | Products are predictable and depend on the reactants and reaction type. |
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Multiple Choice
The equation Cl2 + NaBr → NaCl + Br2 is provided. How would you classify this reaction and why?
Single Replacement, because chlorine replaces bromine in the sodium compound.
Double Replacement, because two compounds exchange ions.
Combination, because two substances are combining.
Decomposition, because a compound breaks apart.
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Multiple Choice
A chemical reaction has the pattern AB + CD → AD + BC. What type of reaction does this represent and what occurs during it?
Single Replacement; one element is displaced.
Double Replacement; ions between two compounds are exchanged.
Combustion; a substance burns in oxygen.
Decomposition; a single compound breaks down.
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Multiple Choice
If you observe a reaction where a single compound, XY, breaks down to form X and Y, what prediction can you make about the reaction type?
It must be a combination reaction because new substances are formed.
It is a decomposition reaction because a single compound is breaking into simpler parts.
It is a single replacement reaction because an element is being replaced.
It is likely a combustion reaction because energy is released.
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Multiple Choice
Analyze the reaction: C10H8 + 12O2 → 10CO2 + 4H2O. Based on the products, what is the most likely classification for this reaction?
A double replacement reaction because there are two products.
A decomposition reaction because a complex molecule is involved.
A combustion reaction because the products are carbon dioxide and water.
A combination reaction because oxygen is a reactant.
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Summary
There are five main types of chemical reactions.
Combination reactions join substances to form one new product.
Decomposition reactions break a substance into simpler parts.
Single replacement is when one element swaps with another.
Double replacement is when parts of two compounds switch.
Combustion reactions use oxygen to produce heat and light.
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Poll
On a scale of 1-4, how confident are you about identifying the different types of chemical reactions?
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Types of Chemical Reactions
Middle School
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