the labatory preparation of oxygen

Oxygen - Oxygen is very essential for the existence of human life on Earth. It is the most abundant element on the surface of the Earth. In a free state, it is present in the Earth's atmosphere to an extent of about 21% by volume, (23.15% by mass) In the combined form, it consti..

In the dormant condition the seeds respiratory rate is very low and so oxygen is required in very small quantities. But for germination, oxygen is needed in large quantities. The seeds obtain this oxygen from the air contained in the soil. Seeds sown deeply in soil, fa..

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 animals in aq..

The energy requirements of metabolic processes are met with to a larger degree by aerobic respiration. Thus the quantity of oxygen available to plants governs their growth ra..

Lithium tarnishes slowly in moist air while dry air has no effect. When heated in air or oxygen at about 200C, it burns with a brilliant white light forming lithium monoxide. ..

An example of sharing of two pairs of electrons (Double bond). Two atoms of oxygen share two pairs of electrons to form one molecule of oxygen (Fig. 3.5). Note :..

Oxygen Molecule (O 2 ) - Therefore, oxygen molecule has 16 electrons. In the formation of molecular orbitals, the electrons in the inner shells are expressed as KK denoting ( s 1s) 2 ( s *1s) 2 .The remaining 12 electrons are filled in mol..

Oxygen is the element, which is essential for the life survival system i.e., respiration. Molecular oxygen (O 2 ) combines with atomic oxygen (O) to produce ozone (O 3 ) layer in the atmosphere, which screens off most of the ultr..

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 source of oxy..

Metals such as silver, gold and platinum adsorb oxygen gas at 500 o C. Molten silver absorbs ten times its mass of oxygen and expels it rapidly on cooling. This phenomenon is called the spitting of silve..