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notsponge [240]
3 years ago
15

How did Wegener explain why fossils of land animals were found on continents that are across oceans from one another?

Chemistry
2 answers:
slamgirl [31]3 years ago
8 0
He explained that with continental drift
levacccp [35]3 years ago
5 0

Answer:

Alfred Wegener gave the continental drift theory. On the basis of his theory, the world was a solitary compressed protocontinent at the beginning, which afterward got drifted away into distinct continents as seen today. He named this protocontinent as Pangaea that means all the lands. In order to support this theory, he further stated that a land bridge once prevailed between Africa and Brazil, and thus, one can witness identical fossilized animals and plants in the two parts of the planet.

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Consider the following scenario
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Answer:

See explaination

Explanation:

Going by the clues that it is between Silver Flouride (AgF) and Sodium Fluoride (NaF) and since it is an aqueous solution , the 1 liter bottle is likely to be Sodium Chloride( NaCl). Going by the reaction,

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Determination of NaCl

Determination of NaCl can be done by Mohr's Method or Volhard's method. But results in Volhard's method are more accurate . Its uses the method of back titration with Potassium Thiocynate which forms a AgCl precipitate . Prior to titration,excess AgNO3 ( The problem also has a clue that excess reagents are present in the lab ) is added to the NaCl solution so that all the Cl- ions react with Ag+. Fe3+ is then added as an indicator and the solution is titrated with KSCN to form a silver thiocyannite precipitate (AgSCN). Once all the silver has reacted, a slight excess of SCN- reacts with Fe3+ to form Fe(SCN)3 dark red complex. The concentration of Cl- is determined by subtracting the titer findings of Ag+ ions that reacted to form AgSCN from the Ag NO3 moles added to the solution. This is used because pH of the solution is acidic. If the pH of solution is basic, Mohr's method is used.

Reactions

Ag+ (aq)+ Cl-(aq) = AgCl(aq)

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