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Darina [25.2K]
3 years ago
11

Dalton's atomic theory stated?

Chemistry
1 answer:
kondaur [170]3 years ago
3 0
John Dalton in d year 1808 proposed d atomic theory.. 1.All elements are made up of small, indivisble particles called atoms. 2.Atoms can neither be created nor destroyed. 3.Atoms of d same element are alike in every aspect, &differ from atoms of all other elements. 4. When atoms combine with other atoms, they do so in simple ratios.
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Answer: Option (a) is the correct answer.

Explanation:

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Therefore, the statement at pH near the pI, nearly all the molecules carry no net charge, is true.

A buffer is composed of a solution of weak acid or base and salt of weak acid/base.So, when pH equals pI then there occurs no net charge. Hence, there will be no existence of conjugate acid-base pair.

Therefore, the statement when the pH is near the pI, the solution is near its maximum buffering ability, is false.

It is known that when pH is less than pI then there will be a net positive charge on the amino acid.

Hence, the statement at a pH near the pI, nearly all the molecules carry a net positive charge, is false.

When pH is greater than pI then amino acid will have a net negative charge. Hence, the statement at a pH near the pI, nearly all the molecules carry a net negative charge, is false.

Thus, we can conclude that out of the given options the statement at pH near the pI, nearly all the molecules carry no net charge, is true.

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3 years ago
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3 0
2 years ago
Which statements are true of precipitation reactions?
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Answer:

When published, each article expands the library of scientific literature available to all scientists and contributes to the overall knowledge base of the discipline of science. They report new research for the first time.

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2 years ago
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Mrac [35]

Answer:

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Explanation:

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3 years ago
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