Answer:
(a) PbSO4 anode is reduced to Pb.
Explanation:
Cells which can be recharged are known as secondary cells. They can be recharged by passing a direct current through them. An example of a secondary cell is the lead storage battery used in motor cars.
During the process of recharging, the electrodes in the cell are reversed from what we have know to occur during discharging because it is electrolized.
At the anode: The lead (II) tetraoxosulphate (VI) absorbs two electrons to become reduced to Pb. Thus at the anode PbSO₄ is reduced to Pb.
![PbSO_4+2e^-\rightarrow Pb+SO_4^{2-}](https://tex.z-dn.net/?f=PbSO_4%2B2e%5E-%5Crightarrow%20Pb%2BSO_4%5E%7B2-%7D)
At the cathode:
The electrons from the anode are accepted at the cathode where the lead (iV) oxide is oxidised into lead (II) ions.
![PbSO_4+2H_2O\rightarrow PbO_2+SO_4^{2-}+4H^++2e^-](https://tex.z-dn.net/?f=PbSO_4%2B2H_2O%5Crightarrow%20PbO_2%2BSO_4%5E%7B2-%7D%2B4H%5E%2B%2B2e%5E-)
The charge is 2- (2 minus). This is because sodium ion has a charge of 1+ and 2 of them are there in the compound. Thus the charge is 2-
<span>74.9216 atomic mass units</span>
Wind<span> is the horizontal movement of air from an area of high pressure to an area of low pressure.</span>
<span>Winds are caused by differences in air pressure. </span>
These differences are caused by the uneven heating of the Earth’s surface.
<span>Winds are named by their direction (where they originate from) and speed.</span>
<span>Wind speed is measured by an anemometer.</span>
<span>v<span> </span></span>Local Winds:<span> winds that blow over short distances-caused by the uneven heating of Earth’s surface within a small area. They form only when large-scale winds are weak.</span>
<span>Ø<span> </span></span>Sea Breeze<span><span>: </span>a local wind that blows from an ocean or a lake.</span>
<span>§<span> </span></span> Occurs because land heats up faster than water – The warm air expands creating an area of low pressure over the land, so the cooler more dense air moves toward the low-pressure land area.
<span>Ø<span> </span></span>Land Breeze<span>: a local wind that blows from the land toward water</span>
<span>§<span> </span></span><span>Occurs because land cools faster than water – The low pressure (less dense) air is now over the water. The warm less dense air rises so the cooler air from the land moves toward that low pressure area by the water.</span>
Answer:
The water makes your individual hairs stick close together. ... When more light is absorbed by your wet hair, less light gets reflected back to your eyes. The result is that your hair appears darker than when it's dry.