Science Physical and Chemical Changes

Physical Changes:

-I had this liquid on a spoon above a lit candle, it turned into a crystal and I knew that it was only a physical change, because this only changed the way the substance looked.

-I put water in the freezer and saw that it froze, a physical change because it didn't do anything to alert a chemical change.

-I put sugar in water and dissolved it to make a solution, this is a physical change because it can be reversed.

Chemical Changes:

-Someone lighted the candle and I watched the string burn its self out, this is a chemical change because its not reversible.

-My mom put the cookies in the oven and I watched from outside the heat forging the batter into a new substance, cookies.

-I put baking soda in a tissue then pushed it into a bottle filled with vinegar, then I left the bottle alone for a bit. It erupted and made a bubbly gas, this is a chemical change because of the gas released.

      -Taha Sarfraz