Renal Ultrasound: Sonography of the Kidneys. Review literature: (Singer et al, 2006). Technique of Renal Ultrasound. Sonography of the kidney is best done in supine position and with inspiration of the patient. In adverse conditions, an elevation of the examination side by 30 degrees is helpful.
By Anne Marie Helmenstine, Ph.D. Chemical Change Definition: A chemical change is a process where one or more substances are altered into one or more new and different substances. Also Known As: chemical reaction.
This is another way to define chemical change:. A process in which chemical bonds are broken and new ones are made. A process like grinding some salt crystals into a fine powder does not involve the breaking of chemical bonds and the formation of new ones, so it is a physical change.