Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu 10/10/14 Do Now How does a chemical reaction affect the original properties of the materials combined? Write your responses in your science journal. Section 3 Types of Chemical Reactions Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Objectives Interpret and write simple chemical formulas. Describe four types of chemical reactions. Classify a chemical equation as one of four types of chemical reactions. Section 3 Types of Chemical Reactions Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Agenda Today we will: –Complete a do now. –Watch a video and complete a video quiz. –Learn about chemical equations. –Complete a group activity. –Complete an individual activity –Exit ticket.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Vocabulary Chemical formula Chemical reaction synthesis reaction decomposition reaction single-displacement reaction double-displacement reaction

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Chemical Formulas A chemical formula is a combination of chemical symbols and numbers to represent a substance. A chemical formula shows how many atoms of each kind are present in a molecule. Section 2 Chemical Formulas and Equations Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Chemical Formula Section 2 Chemical Formulas and Equations Click below to watch the Visual Concept. You may stop the video at any time by pressing the Esc key. Visual Concept Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Chemical Equations Describing Reactions by Using Equations A chemical equation uses chemical symbols and formulas as a shortcut to describe a chemical reaction. From Reactants to Products The starting materials in a reaction are reactants. The substances formed from a reaction are products. Section 2 Chemical Formulas and Equations Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 2 Chemical Formulas and Equations Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Chemical Equations, continued The Importance of Accuracy The symbol or formula for each substance in a chemical equation must be written correctly or it will not correctly describe the reaction. Some formulas and symbols can be confused. Section 2 Chemical Formulas and Equations Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Synthesis Reactions A synthesis reaction is a reaction in which two or more substances combine to form one new compound. For example, a synthesis reaction takes place when sodium reacts with chlorine to produce sodium chloride, which you know as table salt. Section 3 Types of Chemical Reactions Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Decomposition Reactions A decomposition reaction is a reaction in which a single compound breaks down to form two or more simpler substances. Decomposition is the reverse of synthesis. Section 3 Types of Chemical Reactions Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Single-Displacement Reactions A single-displacement reaction is a reaction in which an element replaces another element that is part of a compound. The products of single-displacement reactions are a new compound and a different element. Reactivity of Elements In a single-displacement reaction, a more reactive element can displace a less reactive element in a compound. Section 3 Types of Chemical Reactions Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Double-Displacement Reactions A double-displacement reaction is a reaction in which ions from two compounds exchange places. One of the products of this type of reaction is often a gas or a precipitate. The next slide shows models of each of the four types of chemical reactions. Section 3 Types of Chemical Reactions Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 Types of Chemical Reactions Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu General Form of a Combustion Reaction hydrocarbon + oxygen → carbon dioxde + water

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Exit Ticket What are the four types of chemical reactions?