mattybacchetti
08.07.2019 •
Biology
How many flu pandemics have occurred since 1918? a. 4 b. 5 c. 6 d. 7
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Ответ:
There has been 4 flu pandemics.
Ответ:
The correct answer is option (b). combining a single oxygen atom (O) with an oxygen molecule (
).
The molecular formula of the ozone is
. the combination of the molecular oxygen with the oxygen atom can result in the formation of the ozone molecule.
As the ozone do not have chlorine in its structure, combining oxygen and chlorine cannot form ozone.
Combining two oxygen atom would form an oxygen molecule, not the ozone.
Breaking oxygen molecule would result in formation oxygen atom, not ozone.
Hence, the options (a), (c), and (d) are incorrect.