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Lunna [17]
3 years ago
5

What percentage of geologic time is represented by recorded history? (Assume 5000 years for the length of recorded history.)

Geography
1 answer:
Ray Of Light [21]3 years ago
3 0

Answer:

only about 20% - 35%

Explanation:

We do not know that much about the earth itself, and people just recently started discovering the earth for what it truly is. Though, we have been recording earthquakes and tsunamis since the early 19th century.

This makes up anywhere from 20% to 35%. It is hard to know the exact percentage for sure.

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Answer:

The hydrogen gas is prepared in the laboratory required zink granules, dilute sulphuric acid or dilute hydrogen chloride, flask or woulfe’s bottle, and thistle funnel. by the downward displacement of water because it is a gas lighter than water

Reaction:

Zn  (s)+2HCl  (aq)  →ZnCl2(aq)+H2(g)

​Zn (s)+H2SO4(aq)→ZnSO4(aq)+H2(g)

The zinc granules are taken in a flask or Woulfe’s bottle and It is connected with the delivery tube to a water trough containing water. Dilute sulphuric acid is poured slowly from the thistle funnel. The hydrogen gas is released and collected in a gas jar by by the downward displacement of water as H2 gas lighter than water

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