GCIDE(0.00 / 0 votes)Rate this definition: recuse(v. i.) To withdraw oneself from serving as a judge or other decision-maker in order to avoid a real or apparent conflict of interest; -- often used with the reflexive; as, the judge recused himself due to a financial interest in the matter.
When hydrogen peroxide bubbles, it is undergoing a chemical change. Which statement best describes what is happening? The atoms in hydrogen peroxide are breaking apart and forming new types of molecules. Four students are analyzing four different substances and recording their findings in this table.
Thus, if bubbles appear in a liquid (and the liquid is not simply boiling), we know that a gas has been produced by some chemical change (a reaction). If an odor appears where there had been none, that also tells us that a new substance has been made. Appearance of a new color is also a sign of a chemical change. Many chemical reactions produce enough heat to be easily noticed, and that can alert us that a chemical change has occurred. (Other processes besides chemical reactions also involve heat, such as phase changes. Therefore, a temperature change does not necessarily mean that a chemical reaction has occurred, just that a chemical reaction might be what caused the temperature change.) Safety Precautions: â¢ Wear your safety goggles at all times.