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Rufina [12.5K]
3 years ago
9

Why might it be important in a real life situation, to know if a chemical or physical change occurred?

Chemistry
1 answer:
Roman55 [17]3 years ago
6 0
There are four signs<span> that a chemical reaction has occurred: a </span>change<span> in color, a </span>change<span> in temperature, formation of a gas or formation of a precipitate. A precipitate is a solid that forms when two liquid solutions are mixed. As matter </span>changes<span> in a chemical reaction, it can either absorb or release energy.</span>
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Which atom would tend to gain 1 valence electrons from another atom in order to become stable
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Answer: Option (D) is the correct answer.

Explanation:

Atomic number of chlorine is 17 and its electronic distribution is 2, 8, 7.  

So, in order to attain stability it tends to gain one electron from a donor atom. Therefore, a chlorine ion is formed as Cl^{-1}.

As it gains only one electron that is why, -1 charge occurs.

Whereas Ar is a noble gas with atomic number 18. As it has completely filled octet so it will be unreactive in nature as it is already stable.

Similarly, He is also a noble gas so it is unreactive in nature.

Atomic number of boron (B) is 5 with electronic distribution 2, 3. So, in order to attain stability it needs to lose 3 electrons.

Thus, we can conclude that Cl is the atom which tends to gain 1 valence electron from another atom in order to become stable.

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3 years ago
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Answer:

Compound

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Soda itself is a mixture made out of compounds.

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