4. ๏ Is the colourless , odourless and
tasteless gas.
๏ Oxidation โ it is the process of uniting
or of causing a substance to unite with
the oxygen.
5. ๏ Carl Wilhelm Schele โ a Swedish
chemist who discovered oxygen for the
first time in 1772.
7. ๏ Humans need it to breathe.
๏ Needed for decomposition of organic
waste.
๏ Water can dissolve oxygen and it is
this dissolved oxygen that supports
aquatic life.
13. ๏ The eastโs atmosphere consists of 21%
oxygen
๏ The earthโs lithosphere consists of
99.5% oxygen
๏ The earthโs hydrosphere consists of
46.60% oxygen.
๏ The earthโs biosphere consists of
0.01% oxygen.
23. ๏ถ Name-oxygen
๏ถ Symbol-O
๏ถ Atomic no.-8
๏ถ Uses-for oxidation reactions for the
respiration for the respiratory function
of humans, animals, plant, some types
of bacteria e.tc.
๏ถ Sources- photolysis, photosynthesis.
๏ถ Reservoir-biosphere, atmosphere,
lithosphere.