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Chemical Reactions: Types and Equations

Learn about chemical reactions, their signs, and how to write chemical equations. Understand synthesis, decomposition, single-displacement, and double-displacement reactions.

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Chemical Reactions: Types and Equations

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  1. Section 3 Types of Chemical Reactions Chapter L2 Do Now Explain what happens to bonds when a chemical reaction occurs? What are the signs that a chemical reaction occurred? Write your responses in yournotebook.

  2. Physical and Chemical Properties MS-PS1-2 • 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. Vocabulary Chemical formula Chemical equation Reactant product yields • 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. Homework worksheet

  3. Objectives:Identify simple chemical formulas and classify the four types of chemical reactions by obtaining information related to them. • Agenda • Today we will: • Complete ado now • Teacher presentation • teamwork practice. • Review and exit ticket • Vocabulary • Chemical formula • Chemical equation • Reactant • product • yields Today I will: Learn about chemical equations. So that I can: apply that knowledge to various forms of chemical reactions I will know I got it if: I can identify the parts and forms of equations.

  4. Section 2 Chemical Formulas and Equations Chapter L2 Chemical Formulas • Achemical formulais 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.

  5. Section 2 Chemical Formulas and Equations Chapter L2 Chemical Equations • Describing Reactions by Using EquationsAchemical equationuses chemical symbols and formulas as a shortcut to describe a chemical reaction. • From Reactants to ProductsThe starting materials in a reaction arereactants.The substances formed from a reaction areproducts.

  6. Section 2 Chemical Formulas and Equations Chapter L2

  7. Section 2 Chemical Formulas and Equations Chapter L2 Chemical Equations, continued • The Importance of AccuracyThe 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.

  8. Section 3 Types of Chemical Reactions Chapter L2 Synthesis Reactions • Asynthesis reactionis 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.

  9. Section 3 Types of Chemical Reactions Chapter L2 Decomposition Reactions • Adecomposition reactionis a reaction in which a single compound breaks down to form two or more simpler substances. • Decomposition is the reverse of synthesis.

  10. Section 3 Types of Chemical Reactions Chapter L2 Single-Displacement Reactions • Asingle-displacement reactionis 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 ElementsIn a single-displacement reaction, a more reactive element can displace a less reactive element in a compound.

  11. Section 3 Types of Chemical Reactions Chapter L2 Double-Displacement Reactions • Adouble-displacement reactionis 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.

  12. Section 3 Types of Chemical Reactions Chapter L2

  13. Exit Ticket Describe and name the 4 types of chemical reactions.

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