Hydrogen peroxide kills bacteria by oxidizing their cell walls, stealing electrons from them and disrupting their chemical structures. Hydrogen peroxide is a compound with two hydrogen atoms and two oxygen atoms. It is very similar to water, but it has an extra oxygen atom that is shed readily to react with its environment, often in ways that are destructive to surrounding organisms.Know More
The destructive oxygen in hydrogen peroxide is known as a free radical. The peroxide group, which is composed of two oxygen ions, reacts with bacterial cell walls and other cells' structures. Each oxygen atom has an unpaired electron, which is highly unstable and makes it extremely reactive.
While hydrogen peroxide is a common disinfectant due to its bacteria-killing properties, it is dangerous to human cells as well as bacteria. It damages the surrounding tissue if it is left on a wound for too long. At higher concentrations, it is corrosive. The body has some defenses against this activity, however, which produces the foaming often noted after hydrogen peroxide application.
The human body has certain enzymes that help break down peroxides before they do too much damage, because such free radicals are formed naturally during aerobic respiration. The focus on dietary antioxidants in recent years arises from metabolic free radicals damaging human cells in the same way that manufactured peroxide does.Learn More
Water makes a good solvent because of its composition of positively and negatively charged molecules that allow it to attract to a variety of substances. With a molecular formula of H2O, water has a positive electrical charge at the hydrogen atom and a negative electrical charge at the oxygen atom.Full Answer >
Chemical Dictionary states that K2CrO4 is the formula for potassium chromate. It is also known as dipotassium chromate. It has a formula mass of 194.20, a melting point of 985 degrees Celsius and a density of 2.73 grams per cubic centimeter.Full Answer >
A stoichiometric air-fuel ratio is the exact air-fuel ratio needed to burn the fuel in the mixture completely, leading to the complete combustion of the fuel. The stoichiometric ratio differs depending on fuel type.Full Answer >
Adding salt to boiling water increases the water's boiling point temperature. Adding any nonvolatile solvent, including salt, to a pure solvent increases its boiling temperature in a process scientists call boiling-point elevation. However, the elevation in this case is hardly noticeable, as it takes almost 4 tablespoons of salt to increase the boiling point of 1 quart of water by 1 degree.Full Answer >