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