Answer: During winter the Northern Hemisphere leans away from the sun, there are fewer daylight hours and the sun hits us at an angle. This makes it appear lower in the sky. In equatorial regions the length of days and the directness of sunlight don't change as much.
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Answer:
Sugar, sodium chloride, and hydrophilic proteins are all substances that dissolve in water. Oils, fats, and certain organic solvents do not dissolve in water because they are hydrophobic.
And, water is called the "universal solvent" because it dissolves more substances than any other liquid. ... Water molecules have a polar arrangement of the oxygen and hydrogen atoms—one side (hydrogen) has a positive electrical charge and the other side (oxygen) had a negative charge.
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Answer: The half-reactions represents reduction are as follows.
Explanation:
A half-reaction where addition of electrons take place or a reaction where decrease in oxidation state of an element takes place is called reduction-half reaction.
For example, the oxidation state of Cr in
is +6 which is getting converted into +3, that is, decrease in oxidation state is taking place as follows.
![Cr_{2}O^{2-}_{7} + 3 e^{-} \rightarrow Cr^{3+}](https://tex.z-dn.net/?f=Cr_%7B2%7DO%5E%7B2-%7D_%7B7%7D%20%2B%203%20e%5E%7B-%7D%20%5Crightarrow%20Cr%5E%7B3%2B%7D)
Similarly, oxidation state of Mn in
is +7 which is getting converted into +2, that is, decrease in oxidation state is taking place as follows.
![MnO^{2-}_{4} + 5 e^{-} \rightarrow Mn^{2+}](https://tex.z-dn.net/?f=MnO%5E%7B2-%7D_%7B4%7D%20%2B%205%20e%5E%7B-%7D%20%5Crightarrow%20Mn%5E%7B2%2B%7D)
Thus, we can conclude that half-reactions represents reduction are as follows.