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Notes # 2 Properties of & Changes in Matter

Notes # 2 Properties of & Changes in Matter. Physical & Chemical Properties. A ___________ property is readily observable and does not change the chemical nature of matter. Ex. A few examples include color, smell, size, melting point, boiling point, luster, solubility, and density.

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Notes # 2 Properties of & Changes in Matter

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  1. Notes #2Properties of & Changes in Matter

  2. Physical & Chemical Properties • A ___________ property is readily observable and does not change the chemical nature of matter. • Ex. A few examples include color, smell, size, melting point, boiling point, luster, solubility, and density. If I asked you to describe this car, you would most likely list just its physical properties. Physical

  3. Physical Properties Intensive Properties- Do NOT depend on size Extensive Properties- DO depend on size Blue color Pearly luster Steel body and frame Melting point of metal 218.8 inches long 4,136 pounds 20 cu.ft. interior space

  4. A ___________ property is only observable during a chemical reaction and causes a change to the chemical nature of matter. Ex. A few examples include flammability, corrosion/oxidation, combustion, reactivity with water, and pH. If you take a look at this car, you can see one of the chemical properties of the metal – it rusts (oxidizes) Physical & Chemical Properties Chemical

  5. A ___________ change is one that does not result in the production of a new substance. You can often “undo” these changes. Ex. Mixing salt and water together gives you salt water, but you still have salt and you still have water. You can separate them out again. Ex. If you melt ice, you still have water. You can “undo” this and freeze it back. No new substance is made, it's still just water. Physical & Chemical Changes Physical

  6. A ___________ change is one that results in the production of another substance and is often seen as a change in color, odor, temperature, or the production of gas bubbles. You cannot “undo” these changes. Ex. Burning a piece of firewood. That charred black remnants of a log is no longer wood – it's a new substance. Ex. A penny turns green. The coating of green patina is a new substance as the copper in the penny oxidizes, reacting with the oxygen in the atmosphere in the presence of air moisture. Physical & Chemical Changes Chemical

  7. Is it a Physical or Chemical Change? - Identify the change in each of the four video clips as a physical or chemical change.

  8. In a chemical reaction, original substances (reactants) are consumed and new substances (products) are formed. The total mass of the reactants will always equal the total mass of the products. Signs of chemical change: - color change - gas given off (bubbles) - solid formed - heat given off The Law of Conservation of Mass

  9. The law of conservation of mass states that in any physical change of chemical reaction, mass is neither created nor destroyed; it is conserved. NH4NO3 N2 + O2 + H2O 40g 14g 8g ___ MgCl2 + Ca(OH)2 Mg(OH)2 + CaCl2 32g ___ 25g 28g The Law of Conservation of Mass

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