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Chemistry Basics: Understanding Properties and Changes

Learn about physical and chemical properties, phases of matter, types of changes, and examples of alterations in substances in this educational episode. Understand the difference between physical and chemical changes and types of matter phases.

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Chemistry Basics: Understanding Properties and Changes

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  1. http://www.youtube.com/watch?v=QL7V3L3dfDM&feature=player_embeddedhttp://www.youtube.com/watch?v=QL7V3L3dfDM&feature=player_embedded Episode 201

  2. Definition of Properties • Physical properties can be observed without chemically changing matter. • Chemical properties describe how a substance interacts with other substances. • Extensive properties are physical or chemical properties that depend on the amount of matter present. • Intensive properties are physical or chemical properties that do not depend on the amount of matter. Episode 201

  3. Examples of Properties Physical Chemical Physical Chemical Chemical Physical Physical Chemical Physical Chemical Physical Intensive Intensive Intensive Intensive Extensive Intensive Intensive Intensive Extensive Intensive Intensive Physical or Chemical? Extensive or intensive? Malleability Reactivity Density Combustibility Flammability Color Texture Acidity Mass Ability to rust Solubility Episode 201

  4. Phases of Matter • Solids • Definite shape • Definite volume • Particles are packed together • Liquids • Indefinite shape • Definite volume • Particles have room to move • Gases • Indefinite shape • Indefinite volume • Particles are far apart • Plasma • High energy state where electrons are torn from the particles Are phase changes considered to be a physical or chemical change? Episode 201

  5. Types of Change • Physical change • No change in the identity of the substance • Chemical change • One or more new substances are produced • PHASE CHANGES ARE PHYSICAL CHANGES. Episode 201

  6. Freezing point • Liquid to solid • Melting point • Solid to liquid • freezing point = melting point • Boiling point • Liquid to gas • Condensation point • Gas to liquid • Sublimation point • Solid to gas Episode 201

  7. Examples of Changes Physical or Chemical? Phase change Tearing Grinding Combustion Acid rain Ductility Cooking MORE? Physical Physical Physical Chemical Chemical Physical Chemical Episode 201

  8. Is new matter formed in physical or chemical changes? • Law of Conservation of Mass • Mass cannot be created nor destroyed. http://www.youtube.com/watch?v=ablz_JyRMgQ&feature=related Episode 201

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