(-100)÷_=(-10) find the missing number

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Conversion of a metal oxide to metal is called reduction. The reduction can be induced by many reagents. Many metal oxides convert to metals simply by heating

For example, silver oxide decomposes at 200 °C:

2 Ag2O → 4 Ag + O2

Most often, however, metals are obtained from their oxides by chemical reduction, i.e. by the addition of a chemical reagent. A common and cheap reducing agent is carbon in the form of coke. The most prominent example is that of iron ore smelting. Many reactions are involved, but the simplified equation is usually shown as:

2 Fe2O3 + 3 C → 4 Fe + 3 CO2

Apart from carbon, hydrogen or even other metals can also convert metal oxides to metal:

H2 + CuO → Cu + H2O

Zn + CuO → ZnO + C

Metal oxides can be reduced by organic compounds. This redox process is the basis for many important transformations in chemistry, such as the detoxification of drugs by the P450 enzymes and the production of ethylene oxide, which is converted to antifreeze. In such systems, the metal center transfers an oxide ligand to the organic compound followed by regeneration of the metal oxide, often by oxygen in the air.

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Micro-hydropower systems are small hydropower plants that have an installed power generation capacity of less than 100 kilowatts (kW). Many micro-hydropower systems operate “run of river,” which means that no large dams or water storage reservoirs are built and no land is flooded.

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Explanation:Micro hydro is a type of hydroelectric power that typically produces from 5 kW to 100 kW of electricity using the natural flow of water. Installations below 5 kW are called pico hydro. These installations can provide power to an isolated home or small community, or are sometimes connected to electric power networks, particularly where net metering is offered. There are many of these installations around the world, particularly in developing nations as they can provide an economical source of energy without the purchase of fuel. Micro hydro systems complement solar PV power systems because in many areas water flow, and thus available hydro power, is highest in the winter when solar energy is at a minimum. Micro hydro is frequently accomplished with a pelton wheel for high head, low flow water supply. The installation is often just a small dammed pool, at the top of a waterfall, with several hundred feet of pipe leading to a small generator housing. In low head sites, generally water wheels and Archimedes screws are used.

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