A modern disposable battery commonly contains zinc, manganese dioxide and an alkaline solution, while a modern rechargeable battery is primarily made up of lithium-carbon, cobalt dioxide and an organic solution with dissolved lithium salts. The chemicals that are typically used in batteries are heavy metallic elements, which are toxic even in minute quantities.Know More
A battery is a device that carries a certain amount of chemical energy that can be transformed into electrical energy. It can be used to power everyday items, such as computers, cameras, tools, flashlights, clocks, toys and cell phones. Batteries make it more convenient for portable electronic devices to be carried around.
A battery is composed of a positive terminal called a cathode, a negative terminal known as an anode and an electrolyte, which acts as an insulating and conducting material. A non-rechargeable battery uses zinc as anode and manganese dioxide as cathode. These two electrodes are submerged in an alkaline solution that acts as the electrolyte and allows electricity to flow from the anode to the cathode when the battery is connected to an electronic device. Disposable batteries generate electrical power until all the reactants are consumed. A rechargeable battery uses lithium-carbon as anode and cobalt dioxide as cathode. The electrolyte is an organic solution with dissolved lithium salts. In a rechargeable battery can be used repeatedly since the electro-chemical reactions are reversible.Learn more about Chemistry
Six methods of separating chemicals are filtration, chromatography, distillation, evaporation, centrifugation and using a separating funnel. Chromatography, distillation and evaporation are used to separate solutions, in which one or more chemicals are dissolved in a solvent. Filtration, centrifugation and separating funnels are used to separate mixtures of insoluble chemicals.Full Answer >
Lithium-ion (LiOn) batteries can handle hundreds of charge/discharge cycles, don't suffer from the memory effect, hold a charge better, work at higher voltages, are more compact and are lighter than nickel-cadmium (NiCad) batteries. However, they are more expensive and aren't available in standard sizes.Full Answer >
The biuret test detects peptide bonds, and when they are present in an alkaline solution, the coordination complexes associated with a copper ion are violet in color. The protein concentration affects the intensity of the color, and the color will be more intense with more proteins.Full Answer >
Blue litmus paper remains blue when contacted by an alkaline solution, while red litmus paper turns blue. Litmus paper may also be used to determine the acidity and neutrality of a solution.Full Answer >