Signs of a Chemical Change
By: Cariss Crosland
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.
A precipitate is a solid that forms when two substances chemically change it is a form of a new substance. Some examples are cheese and gooey gak.
Production form a Gas
Forming a gas is when two liquids are chemically combined and bubbles or foam is seen it is a form of a new substance. Examples are mixing baking soda and vinegar together and they will produce bubbles/foam.
Temperature change is when you combine two or more substances and it gets hotter or colder.