Because neither can be created or destroyed
Answer:
Noble gases are the least reactive of all elements
Explanation:
because they have eight valence electrons, which fill their outer energy level
The given reaction is not spontaneous.
We must recognize changes in oxidation states that take place across elements in order to balance these equations. To accomplish this, keep in mind following guidelines:
A neutral element on its own has an oxidation number of zero.For a neutral molecule, the total number of oxidations must be zero.The net charge of an ion is equal to the sum of its oxidation numbers.In a compound: hydrogen prefers +1, oxygen prefers -2, fluorine prefers -1.In a compound with no oxygen present the other halogens will also prefer -1.
One of the mercury atoms is oxidized from +1 to +2 in the simple aqueous ion, for a loss of 1 electron.
Oxidation half-reaction:
→

The other mercury is reduced from +1 to zero in mercury metal, for a gain of 1 electron.
Reduction half-reaction:
→

This is a disproportionation redox reaction !
Net reaction:
→

The cell potential is negative so this reaction is NOT spontaneous.
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Answer:
The reason that the balloon shrinks is because when the temperature drops, helium becomes more dense then it already is. So what happens is that its molecules lose energy, slows down and moves closer together to conserve heat and this decreases the volume inside the balloon because the helium molecules are moving closer together, rather than outward toward the shell of the balloon which cause the balloon to swell then shrink. The gas law that causes this to happen is the Charles law.
Explanation: