1. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Bellringer Explain what happens to bonds when a chemical reaction occurs? What are the signs that a chemical reaction occurred? Write your responses in your science journal. Section 3 Types of Chemical Reactions Chapter L2

2. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Physical and Chemical Properties Objective Interpret and write simple chemical formulas. Describe four types of chemical reactions. Classify a chemical equation as one of four types of chemical reactions. MS-PS1-2 Agenda Today we will: Complete the do now Watch a video and complete quiz on chemical equations. Guided instruction/ teamwork practice. Review and exit ticket. Vocabulary Chemical formula Chemical equation Reactant product Homework worksheet

3. 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

4. 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

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

6. 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

7. 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

8. 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

9. 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

10. 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

11. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Exit Ticket Describe and name the 4 types of chemical reactions.