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Catalyst

Catalyst. Classify as a compound, mixture, or element: 1. 3. 2. 4. Today’s Agenda. Physical Properties. A physical p roperty is a property that can be determined without changing the nature of the substance ex: color, hardness, density, state (solid, liquid, or gas)

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Catalyst

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  1. Catalyst • Classify as a compound, mixture, or element: • 1. 3. • 2. 4.

  2. Today’s Agenda

  3. Physical Properties A physical property is a property that can be determined without changing the nature of the substance ex: color, hardness, density, state (solid, liquid, or gas) What are some physical properties of cheese?

  4. Chemical Properties A chemical property describes a substance’s ability to participate in chemical reactions Ex: ability to rust, burn, produce gas • We can determine a chemical property only when the substance is undergoing a change in composition. Ex: rusting  you can only tell that a substance has this chemical property once you expose it to oxygen for a prolonged period of time

  5. Physical or Chemical Property? • Iron rusts. • Plants are green. • Your body temperature is 98.6 degrees F. • Plants produce oxygen from carbon dioxide.

  6. Today’s Agenda

  7. Physical Changes Physical change: a change in which the identity of the substance does not change. Ex: Phase changes (solid to liquid to gas)

  8. Physical Changes In a physical change, the arrangement, location, and speed of he particles may change. Check for understanding: How do the water molecules change arrangement and speed when water goes from a liquid to a gas?

  9. Physical Changes Some more examples: -dissolving -tearing -melting -freezing -condensing

  10. Physical Changes Physical changes are usually reversible. You can go back to whatever you started with after a physical change!! Ex: Dissolving sugar into water is a physical change. If we get creative, we can heat up the mixture to evaporate the water and separate it from the sugar.

  11. Chemical Changes Chemical changes involve the creation of a new substance. Evidence that a chemical change occurred: • a gas is produced • color change • an odor is produced • light is produced • the temperature changes without heating or cooling

  12. Chemical Change Some examples: -spoiled milk -burning -rusting

  13. Chemical Changes A chemical change is IRREVERSIBLE. You cannot go back to what you started with!

  14. Practice! Identify these as physical or chemical changes. • Frozen popsicle  Melted popsicle • Raw meat  cooked meat • Unused charcoal  lit charcoal • Intact paper plate  torn paper plate • Making salt water • Lighting Sparkers

  15. Today’s Agenda

  16. Today’s Agenda

  17. Exit Slip! Identify the following as a chemical or physical property: 1. Water is a liquid 2. Gasoline is flammable Identify the following as a chemical or physical change: 3. A candle burning 4. A rock being crushed 5. Bread molding

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