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Physical Properties

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  1. Physical Properties Section 2.2

  2. Objectives • Measure length, mass, volume, temperature, and time during an investigation. • Compare the densities of regular and irregular objects using their respective measures of volume and mass. • Identify pure substances by their physical and chemical properties (color, luster, reflectivity, hardness, conductivity, density, pH, etc.). • Distinguish between physical and chemical changes in matter. • Classify a substance as being made of one kind of atom (element) or a compound when given the molecular formula or structural formula for the substance. • Compare and contrast the common properties of metals, nonmetals, and metalloids. • Compare and contrast the properties of acidic, basic, and neutral solutions.

  3. Demonstration Observe some properties of the piece of paper:

  4. Demonstration Observe some properties of the of the candle:

  5. Think Back to Last Week What properties did we notice about the powders we analyzed in our activity last week?

  6. Physical Properties Physical property – any characteristic of a material that can be observed or measured without changing the composition of the substance. Temperature Color State of matter Texture Hardness Acidity

  7. Physical Properties • Viscosity refers to the thickness of a fluid or its resistance to flowing. • Usually affected by temperature. Viscosity Demo

  8. Physical Properties • Conductivity is a measure of a material’s ability to conduct heat or electricity. • Metals tend to be good conductors.

  9. Physical Properties • Malleability is the ability of some materials to be hammered into shapes. • Gold is very malleable, glass is not!

  10. Summary Name and describe at least one physical property we’ve talked about today. Please use a complete sentence!!!

  11. Objectives • Measure length, mass, volume, temperature, and time during an investigation. • Compare the densities of regular and irregular objects using their respective measures of volume and mass. • Identify pure substances by their physical and chemical properties (color, luster, reflectivity, hardness, conductivity, density, pH, etc.). • Distinguish between physical and chemical changes in matter. • Classify a substance as being made of one kind of atom (element) or a compound when given the molecular formula or structural formula for the substance. • Compare and contrast the common properties of metals, nonmetals, and metalloids. • Compare and contrast the properties of acidic, basic, and neutral solutions.

  12. Physical Properties • Hardness is a measure of one material’s ability to scratch another. • Diamond is the hardest known material. • Melting point is the temperature at which a solid becomes a liquid. • Water melts and freezes at 0o C. • Lead melts and freezes at 327o C. • Boiling point is the temperature at which a liquid becomes a gas. • Water boils and condenses at 100o C. • Nitrogen boils and condenses at -196o C.

  13. Physical Properties • Magnetism refers to the ability to be attracted by magnets.

  14. Physical Properties • Density is the ratio of a substance’s mass to its volume. • Density = mass / volume Key Question: What determines if an object floats or not??? Demonstration

  15. Let’s Talk About the Demo Why did the bubble float? Hyperlink

  16. Physical Properties POP QUIZ!!! What is the density of water???

  17. Summary #1 Name and describe at least one physical property we’ve talked about today. Please use a complete sentence!!!

  18. Physical Changes Super Important Note of the Day!! • A physical change is a change in a material’s form or appearance without changing the identity of the material. • Examples: • Crushinga piece of chalk. • Crumplinga sheet of paper. • Meltingcandle wax.

  19. Summary #2 From the list on the right, list which of the following are physical changes (get both summaries approved when you are done): Write in List Form!!! • Bite a piece of cheese. • Burning a log. • Creating bubbles from baking soda and vinegar. • Break a stick in half. • Use paint to paint a piece of paper. • Freeze water into ice. • Make snow into a snowball. • Bake cake batter into a cake.

  20. Homework Homework Properties of Matter Vocabulary WS

  21. What are the Properties of Cola? Physical Properties?

  22. Physical Properties • pH is a measure of how strong an acid or base is. • Acid – has a pH measure lower than 7. • Base – has a pH measure higher than 7. • Neutral – has a pH measure equal to 7.