Physical and chemical changes

PHYSICAL CHANGES

1. The first thing i observed was water freezing and turning into ice.

I categorized this as a physical change, as it is still water and it just froze by changing its physical state from liquid to a solid.

2. The second thing i observed was an egg boiling. This is a physical change because it is still an egg, but it turned from a liquid to a solid state.

3. I observed turning a light bulb on, turns a dark room, into a well lit room. This is a physical change as it is changing the room, and you can still bring back the darkness.

CHEMICAL CHANGES

1. I observed how instant dry yeast reacts with hot water and sugar to create a frothy solution. This is a chemical change, as you can clearly see that it is changing the things used to make something else.

2. I observed when you add fabric stain remover to water and put a stained cloth in, there is a chemical reaction, and the stain is removed.

3. I observed that my baby brothers bubble machine makes bubbles, by blowing air into soapy water. this is a chemical change because the air interacts with the soapy water, making something new (bubbles).

By: Ahmad Khan