Frying an egg is a chemical change. A chemical change is any change in which a new substance is formed. It is irreversible.Continue Reading
During a chemical change, the end substance has a different chemical composition than the starting materials. Any substance that changes form, produces gas bubbles or changes color has undergone a chemical change. A chemical change cannot be reversed. For example, once an egg has been fried, it cannot ever go back to its original form.
A physical change happens when a substance changes form but keeps the same chemical composition. The change can be reversed by taking away the cause of the physical change. Salt water is a good example of physical change. Once the salt and water have been separated, both objects go back to their original states. Folding paper is another example of a physical change. The paper changes form, but its chemical composition stays the same.
Sometimes, it may be hard to tell if the change that has taken place is physical or chemical. Melting ice cream is a physical change because the chemicals used in the ice cream are the same melted or frozen. Food that's gone bad is a chemical change because the food can never go back to being "good."Learn more about Organic Chemistry
The enthalpy of hydration is the change in enthalpy when an ion is dissolved in water to infinite diluteness. Enthalpy is a thermodynamic term for the internal energy of a system plus the product of the pressure and the volume of the system. Enthalpy of hydration is always negative.Full Answer >
A change in the pH, or acidity level, can change the shape of an enzyme, preventing it from fulfilling its purpose, according to a Florida State University biochemistry laboratory manual. According to Elmhurst College, enzymes increase the rate of cellular reactions.Full Answer >
Wood does not have a chemical formula because it is not an individual chemical compound but is made up of many chemical structures. Within its cellular structure, there are three chemical components which are principally composed of carbon, oxygen and hydrogen. These three chemical components are cellulose, hemicellulose, and lignin.Full Answer >
The chemical formula Al2(CO3)3 refers to the chemical aluminum carbonate. This chemical compound of aluminum, carbon and oxygen is unstable and rapidly decomposes to aluminum hydroxide and carbon dioxide.Full Answer >