Toasting bread is a chemical change since changing the bread to toast cannot be reversed. A chemical change affects the very essence of the object since the substances available at the beginning of the process are no longer available after completion of the process.Know More
Chemical changes affect the nature of the object in question and normally occur through a chemical reaction. A physical change on the other hand can be reversed in such a way that the original object is created once again. Both physical and chemical changes do not affect the mass of the object in question since the law of conservation states that mass remains the same before and after a physical or chemical change.
Another way to look at chemical change is that the particles that make up an object are broken down into finer particles that form a new object. Once these particles have been broken down, there is no way to join them together once again. On the other hand, physical change involves rearranging f particles that make up a given object or substance.
Other examples of chemical change include the rusting of metal, milk turning sour, fuel burning, the body digesting food that has been eaten and when a piece of paper is set on fire.Learn more about Chemistry
Frying an egg involves a chemical change. The heat in the frying process gives energy to the egg's molecules and brings about a permanent change in the substance.Full Answer >
A burning candle is an example of a chemical change because the paraffin wax, which is a hydrocarbon, undergoes a chemical reaction with oxygen to form water and carbon dioxide gas. Because the chemical structure of the paraffin has been altered, this is a chemical change.Full Answer >
Harper College explains that forming a precipitate, color changes, gas formation and temperature change are signs of a chemical change. The University of California, Davis adds that the presence of odor also indicates a chemical change. There are only five indicators of a chemical change.Full Answer >
Tarnishing is a chemical change that occurs when certain metals are exposed to air or other sources. The change, known as oxidation reaction, is what leaves behind the tarnish.Full Answer >