Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Physical and Chemical Properties Big Picture MS-PS1-2 Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred. MS-PS1-2

Objectives: Analyze differences between changes produced by chemical and physical reactions.  Agenda  Today we will:  Teacher presentation on chemical and physical reactions.  Group Work  Individual Work  Lab Exercise (day 2)  Exit ticket  Vocabulary Physical reaction Chemical reaction Today I will: Learn about physical and chemical reactions. So that I can: apply that knowledge to various forms of matter that undergo changes. I will know I got it if: I can describe physical and chemical reactions and use that knowledge to identify a specific reaction.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Physical and Chemical Properties Do Now Take out Homework Prepare for quiz on physical and chemical properties. MS-PS1-2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Physical and Chemical Properties Do Now Take out Lab and read procedures MS-PS1-2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Physical and Chemical Properties Do Now List 2 physical and chemical properties of matter. What are the major differences between physical and chemical changes? List 3 examples of a physical change and 3 examples of a chemical change. MS-PS1-2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Physical and Chemical Properties Do Now 10/09/14 List 3 examples of a physical change and 3 examples of a chemical change. Lista 3 exemplos de uma mudança física e três exemplos de uma mudança química. Lista 3 ejemplos de un cambio físico y 3 ejemplos de un cambio químico. MS-PS1-2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Chemical Reactions A chemical reaction is a process in which one or more substances change to make one or more new substances. The chemical and physical properties of the new substances differ from those of the original substances. Section 1 Forming New Substances Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Chemical Reactions, continued Signs of Chemical Reactions include color changes, gas formation, the formation of a precipitate (a solid substance formed in a solution), and energy given off as light, thermal energy, or electrical energy. A Change of Properties The most important sign of a chemical reaction is the formation of new substances that have different properties. Section 1 Forming New Substances Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Bonds: Holding Molecules Together A chemical bond is an attraction that holds atoms together in a molecule. Breaking and Making Bonds If molecules bump into each other with enough energy, the chemical bonds in the molecules break. The atoms then rearrange, and new bonds form to make new substances. Section 1 Forming New Substances Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 Forming New Substances Chapter L2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Bonds: Holding Molecules Together, continued New Bonds, New Substances Whenever new substances form, their properties differ from the properties of the starting substances. For example, sodium is a violently reactive metal and chlorine is a greenish poisonous gas. The two elements combine to form a white solid called sodium chloride, or table salt. Section 1 Forming New Substances Chapter L2

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