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
Egyptian slaves were used to build them
Stone tools are more commonly found on archaeological sites thought to be associated with Homo habilis.
The ancient human species Homo habilis, also known as "handy man," lived in East and South Africa during the Early Pleistocene between 2.31 million and 1.65 million years ago (mya). When H. habilis was first described as a species in 1964, there was a lot of debate about it, and many scientists suggested that it be grouped with Australopithecus africanus—the only other early hominin species at the time—but as time went on and more significant discoveries were made, H. habilis gained more recognition. By the 1980s, it had been hypothesized that Homo habilis, which later gave rise to Homo erectus, was a direct ancestor of modern humans.
Learn more about Homo habilis here
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