Physical & Chemical Changes Demonstration powerpoint.

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Presentation 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 Cutting a log in half changes its size Breaking a piece of mossy zinc into pieces.

Shape Forming clay into a bowl changes its shape. Bending a piece of magnesium strip.

State Freezing water into ice cubes changes its state. 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!