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EQ#6 What are the properties of matter?

EQ#6 What are the properties of matter? . What is a (Pure) Substance?. A substance is matter that is uniform & has an unchanging composition. A formula can be written for a substance Ex. H 2 0 or 0 2 A substance can be either an element or a compound . . Elements and Compounds.

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EQ#6 What are the properties of matter?

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  1. EQ#6 What are the properties of matter?

  2. What is a (Pure) Substance? • A substance is matter that is uniform & has an unchanging composition. • A formula can be written for a substance • Ex. H20 or 02 • A substance can be either an element or a compound.

  3. Elements and Compounds • Element: • Contains only 1 type of atom • Found on the Periodic Table • Ex. O2, Fe, Na, He • Compound: • 2 or more elements chemically combined • Ex. H2O, C6H12O6, CO2

  4. Physical Properties • These are characteristics that can be observed without changing the sample’s composition. • They are observed directly with the senses. • Examples include: • Shape, color, density, odor, boiling point, etc.

  5. What are some physical properties of water?

  6. Chemical Properties • This is the ability of a substance to combine with other substances or change into 1 or more substances. • It is the result of contact with another substance, or due to the application of thermal or electrical energy.

  7. Examples of Chemical Properties: • Iron rusts when combined with oxygen • Water decomposes into hydrogen & oxygen • Magnesium burns

  8. Quiz: Physical or Chemical Property? • Water boils at 100°C. • Silver tarnishes. • Propane burns. • Density of Al is 2.7 g/mL. • Carbon is black & brittle. • Zinc reacts in acid.

  9. Extensive vs. Intensive Properties • Extensive properties: • Depends on the amount of a substance present. • Ex. Mass, volume, length • Intensive properties: • Independent of the amount of substance present. • Ex. Density, boiling point, reactivity

  10. Phases of Matter • Vapor is a gaseous state of substance that is normally a solid or liquid at room temperature.

  11. Phases (States) of Matter

  12. Physical Changes: • Physical changes are changes that occur without changing the composition of the substances. • Bending, grinding, crushing, dissolving, cutting, phase changes etc.

  13. Physical Change Examples: • Ice melting: H2O (s)  H2O (l) • Potassium permanganate dissolving in water:

  14. Chemical Changes: • Chemical changes are changes that occur when substances change into new substances. • Also called a chemical reaction. • Exploding, rusting, oxidizing, burning, etc. • New substances formed have a different composition & different properties.

  15. Indicators of a Chemical Reaction: • Gas formation • Solid formation (precipitate) • Change in color • Change in odor • Change in temperature Precipitate:

  16. Physical or Chemical Change? • Alcohol evaporating. • Iron rusting. • Dynamite exploding. • Sugar dissolving in water. • Water boiling. • Baking soda & vinegar reacting. • Dry ice subliming.

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