dissolved oxygen sources

Main source of oxygen are the plants which evolve oxygen as a by-product of photosynthesis. It is used chiefly by most of the living organisms in their aerobic respiration except certain anaerobics. Oxygen acts as a limiting factor in the distribution of ani..

Oxygen is the most abundant of all elements in the crust of the earth. It is present in sand and rocks in the form of silicon dioxide, and in most of the common compounds like oxides, carbonates, nitrates, etc. It is also present in air, water and land as organic compounds like carbohydra..

Sewage that includes organic matter, animal and human excreta-one of the major pollutants of water in the urban and rural areas is the sewage. The sewage most often contains the organic matter that encourages the growth of microorganisms. These organisms besides spreading diseases also consume the..

Oxygen Cycle - Oxygen is another essential element for living organisms. It is present in large quantities (20.95% v/v) in the atmosphere and is also seen in bound state in water and as oxides and carbonates in rocks. Dissolved oxygen in water is the sou..

Experiment 2: Place some crystals of potassium permanganate at the bottom of a beaker. Slowly transfer water into the beaker with the help of a pipette. After sometime a dense purple solution is formed at the bottom and you will notice that it gradually spreads with the rest of water...

Distribution of various elements in the Earth's crust Water is one of the most abundant compounds on Earth, hence sea water is a vast source of a large number of elements. The Earth's atmosphere contains mainly nitrogen (78%), oxygen (21%), and other gases e.g., CO 2 ,..

1) Major source of carbon for the living world is carbon dioxide. Atmosphere contains about 700 x 10 9 metric tonnes of carbon dioxide while ocean water contains about 35,000 x 10 9 metric tonnes of carbon dioxide. 2) Carbonates of earth's crust derived from rocks, which by c..

1) Greatest reservoirs of phosphate are the insoluble ferric and calcium phosphates in rocks (rock phosphate) in combination with calcium, iron and aluminium. Slow process of weathering releases phosphates to the soil. 2) Phosphates are also added to the soil by man in the form of artific..

Source of Electricity - Electrons in different metals can have different energies. If two of these metals are placed in a conducting liquid (electrolyte) a difference in electrical potential is set up between them. A pair of different metals arranged in this way is an electrochemical cell..

When salt is added to boiling water the temperature of boiling water is raised above 100 o C. This is because the salt absorbs heat energy from the water for dissolving in it and its average kinetic energy decreases. When gases dissolve in water it lowers the boiling ..