physical & chemical changes demonstration powerpoint
TRANSCRIPT
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Physical & Chemical Changes
Demonstration powerpoint
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Physical Changes• Physical changes are when the substance is
still the same thing. It has only changed forms.
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Size
•Breaking a piece of mossy zinc into pieces.
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Shape
•Bending a piece of magnesium strip.
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State• Boiling off the water from salt
water. You are left with the salt. Evaporation.
• Dry ice (frozen CO2) goes from a solid to a gas; this is called sublimation.
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Chemical Changes•Chemical Changes are
when a new substance is produced that was not there originally.
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Color• (unexpected color change)
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Clear liquid (ammonia) + clear liquid (PHTH)
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Add PHTH to ammonia
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= pink (unexpected color change)
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Temperature• (unexpected temperature change)
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Ammonium nitrate + water
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Starting temperature 20⁰ C
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Add ammonium nitrate to water
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a temperature decrease of 8⁰ C
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Bubbles & Fizz
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HCl + magnesium strip
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= bubbles and fizz
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New Substance•(precipitate)
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Milk + vinegar =
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Swirl it around
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Chunky stuff
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Steel wool + vinegar = rust
• Another precipitate!