Answer:
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Answer:
Na on the periodic table is sodium.
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The water reaches its boiling point and turns into water vapor. This process is a physical change. The change is substance status. And the physical change will not destroy the molecular structure. So the molecular structure will not change.
Answer: (C) 30 times
Richter scale is used to determine the magnitude of an earthquake from the arrival time of P and S waves. It determines the total amount of energy released during an earthquake.
If Richter magnitude scale measures 6.5 then it produces 30 times more energy than 1 Richter scale magnitude during an earthquake. The magnitude of an earthquake is plotted on a logarithmic scale from 1 to 9 and increases 10 folds by one magnitude. If 6.5 is the magnitude, it means it is 10 times more than 5.5 magnitude earthquake. Similarly the amount of energy is calculated as 30 folds. So 6.5 magnitude will have 30 folds more energy released than that with 5.5 magnitude earthquake.
When the reaction equation is:
Cu 2+(aq) + 2 e- → Cu(S)
from the reaction equation, we can see that each 1 mole of Cu 2+ need 2 moles e-
So, the moles of e- when we have 5 moles copper = 5* 2 = 10 moles
by using this formula we can get the time directly:
time(per sec) = moles of e- * faraday's constant * current
= 10 moles * 96500 coul/mol * 1 sec / 50 coul
= 19300 sec
= 19300 /(60*60) = 5.36 Hours
∴ the answer will be a) 5.36 Hours
