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12345 [234]
3 years ago
7

If motion starts and stops at the same place is this distance zero ?

Chemistry
1 answer:
Shtirlitz [24]3 years ago
8 0
Displacement is zero. Displacement is in reference to the starting and ending positions, so starting and ending in the same place would cause a net displacement of zero. Distance, however, is not zero. It is a measurement of the total amount moved, so if the object left the starting position, the distance is automatically not zero.
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4. a solution that is 0.025M in HCOOH and 0.025M in NaCOOH
saveliy_v [14]

KOH added : 7.5 ml

<h3>Further explanation</h3>

Buffer solution of weak acid HCOOH and strong base KOH

Reaction

initial = 100 ml 0.1 M HCOOH = 10 ml mol HCOOH, and x mlmol of KOH

KOH + HCOOH ⇒ COOHK + H₂O

  x           10

  x            x                 x              x

  -            10-x             x              x

[HCOO - ] = 3[HCOOH]

\tt \dfrac{x}{x+100~ml}=3\dfrac{10-x}{x+100}\\\\x=3(10-x)\\\\x=30-3x\\\\4x=30\rightarrow x=7.5~ml

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