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Physical and Chemical Properties

Physical and Chemical Properties. MS-PS1-2. 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. Physical and Chemical Properties. MS-PS1-2. Do Now.

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Physical and Chemical Properties

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  1. Physical and Chemical Properties MS-PS1-2 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.

  2. Physical and Chemical Properties MS-PS1-2 Do Now • List 2 physical and chemical properties of matter. • What are the major differences between physical and chemical changes? • Give 3 examples of a physical change and 3 examples of a chemical change.

  3. Physical and Chemical Properties MS-PS1-2 Objective Distinguish differences between chemical and physical reactions. RST.6-8.4 Vocabulary physical reaction chemical reaction • Agenda • Today we will: • Watch a video on physical and chemical properties. • Complete a lab involving physical and chemical reactions. • Review and exit ticket. Homework worksheet

  4. Section 1 Forming New Substances Chapter L2 Chemical Reactions • Achemical reactionis 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.

  5. Section 1 Forming New Substances Chapter L2 Chemical Reactions, continued • Signs of Chemical Reactions include color changes, gas formation, the formation of aprecipitate(a solid substance formed in a solution), and energy given off as light, thermal energy, or electrical energy. • A Change of PropertiesThe most important sign of a chemical reaction is the formation of new substances that have different properties.

  6. Section 1 Forming New Substances Chapter L2 Bonds: Holding Molecules Together • A chemical bond is an attraction that holds atoms together in a molecule. • Breaking and Making BondsIf 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.

  7. Section 1 Forming New Substances Chapter L2

  8. Section 1 Forming New Substances Chapter L2 Bonds: Holding Molecules Together, continued • New Bonds, New SubstancesWhenever 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.

  9. Exit ticket • How does a chemical reaction affect the original properties of the materials combined?

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