Signs of a Chemical Change

By: Cariss Crosland

Chemical Changes

Some chemical changes are color change, rusting, formation of a new substance, burn-cook-explode, precipitate form, production of a gas, and temperature change. Chemical changes cannot be reversed unlike physical change which it can be reversed, don't get them confused because they are very different.

Color Change, Rusting, Burn-Cook-Explode

Color Change- color change is when you mix two or more substances and a change in color occurs. An example would be the Iodine Clock Reaction, we did this as a lab and it was white for about 5 minutes then really fast it changed to a very dark purple.

Rusting- is when something metal forms a red/orange coating on the surface when exposed to air and moisture, consisting chiefly or ferric hydroxide and ferric oxide formed by oxidation. It is a form of a new substance. An example is leaving a nail in a cabinet for a year and if you take it out you will find rust over the nail.

Burn-Cook-Explode- Burning-Cooking-Exploding is when you put something somewhere to cook you leave it there for a long time and it burns and it sometimes if it starts to burn is explode it forms a new substance. An example would be spaghettio's in a microwave for to long without putting a paper towel over it and it burns and then explodes all over the microwave.

Formation of a new substance

Whenever two substances combine and create a chemical change, a new substance is ALWAYS formed. Cheese forms when vinegar is mixed with warm milk