Chemical and Physical Changes

Physical Changes: 

1. Boiling Water

I observed that the water evaporated into the air. However it can turn back into a liquid, therefore I have categorized boiling water into physical changes.

2. Crumpling Paper

I observed that when I crumple a paper and open it back out it is still the same paper but a different form. I have categorized this as a physical change because it is the same paper and can turn back to normal.

3. Melting Wax

I observed that when a candle is burning that the wax melts away and turns into a liquid. I have categorized as a physical change because when the flame goes out then the wax can turn back into a solid. 

Chemical Changes:

1. Frying an Egg

I observed that when you fry an egg some of it changes color and it turns into a solid. I have categorized this as a chemical change because it can't change back into the state it was at first. 

2. Rusting Bike

I observed that when a bike rusts it turns into a brown color. This is a chemical change because it can't be changed back into its original form.

3. Burning Wood

I observed that when wood is burnt it turns into a ash and can change shape. However it can't be changed back into its original form. 

Nina Carlos