Types of Chemical Reactions

Physical Science Pages 199-205

Ms. CilliDecember5, 2011

What are the five main types of chemical reactions?

Review them as we wait

Objectives

• Classify chemical reactions as• synthesis • Decomposition• single-replacement• double-replacement• combustion reactions

Explain what is happening.

+ + +

TYPES OF REACTIONSNot all reactions are created equal!

Chemical Types of ReactionsSynthesis

Decomposition

Single-replacement

Double-replacement

Combustion

BOR NOTES V1

• Each group will be assigned a type of reaction

• You will answer the questions

• When all is done, we will come back to class and a group member will present the notes to the rest of the class

BOR NOTES V2

• You will answer the questions

• Each person needs to answer ____ questions

• Save your work, these are the notes for today

Synthesis• A reaction where

_________________________________

• The reactants may be either ________ or ________

• The _______ synthesized is always a ___________

Synthesis• A general reaction:

• Example:

Decomposition

• Opposite of a _________ reaction

• A __________ breaks down into _________

• The reactant must be a ___________

• The products may be _______ or ________

Synthesis• A general reaction:

• Example:

Decomposition

Single-Replacement

• A ________________ is a reaction in which _________ takes the ______ of ________ element

• General equation:

• Example:

Double - Replacement

• Where two _______ compounds exchange ________ and form _____ new compounds

• General equation:

• A replaces ___ and C replaces ____

Double - Replacement

• Example:

• Explain what is happening. What is replacing what?

Combustion

• A reaction where a _______ reacts rapidly with ___________

• _____ and _____ are often produced

• _______ will always be a carbon-containing compound and oxygen

• Products will always be ________ and ________

Combustion

• General Equation:

• Example:

• What are the reactants in the example? Products?

Chemical Reaction using Electrons

Oxidation Reduction• Occurs when a cation (metal) loses an ____________

•A reactant is _________ if it loses electrons

•Occurs when an anion (nonmetal) gains an ____________

•A reactant is _________ if it gains electrons

Ger!!!

Oxidation and Reduction

Lose

Electrons

Oxidized

Goes

Gain

Electrons

ReducedLeo

CLASSIFYING REACTIONS BOR

• On the next slide is four reactions ( you will need to answer one question)

• Classify them as synthesis, decomposition, single replacement, double replacement, or combustion.

• Call me in when you are done

Classifying ReactionsPb(NO3)2 + 2HCl PbCl2 + 2HNO3

Type: ___________

2C2H6 + 7O2 4CO2 + 6H2OType: ___________

Ca + 2HCl CaCl2 + H2

Type: ___________

2SO2 + O2 2SO3

Type: ___________

Classifying Reactions Answers

Pb(NO3)2 + 2HCl PbCl2 + 2HNO3

Type: Double Replacement

2C2H6 + 7O2 4CO2 + 6H2OType: Combustion

Ca + 2HCl CaCl2 + H2

Type: Single Replacement

2SO2 + O2 2SO3

Type: Synthesis

Closure

Which one is not a type of reaction?A. synthesis B. decompositionC. single-replacementD. double-replacementE. All are types of chemical reactions

Assignment: • Independent Work:– Read pages 206-209 in Physical Science– Work on the study guide (details in Schoology)

• Homework:– Section 7.2 HW – Due Tuesday, December 6th by 8PM