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3 years ago

Which of the following is not included in John Dalton's modern theory of the atom?

Chemistry

1 answer:

Akimi4 [234]3 years ago

7 0

The answer for the following question is option "C".

Option C is not included in the John Dalton's modern theory of an atom.

"It states atoms of different elements combine to form new compound" but not new elements

Explanation:

According to John's Dalton's modern theory of an atom:

1. All matter is composed of atoms.

2. Atoms cannot be created,destroyed or subdivided in the ordinary chemical reactions.

3. Atoms of one element differ in the properties from atoms of an another element.

(i.e.)Each and every atom of the element has its own unique properties of their own.

4. Atoms of one element combine with the atoms of another element to form new compound.

5. Atoms that make up an element are identical to each other.

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Calculate [H3O+] and [OH−] for each of the following solutions at 25 ∘C given the pH. pH= 2.89

dimaraw [331]

Answer: The value of $[H_{3}O^{+}]$ is 0.0012 M and $[OH^{-}]$ is $1.02 \times 10^{-14}$ .

Explanation:

pH is the negative logarithm of concentration of hydrogen ion.

It is given that pH is 2.89. So, the value of concentration of hydrogen ions is calculated as follows.

$pH = - log [H^{+}]\\2.89 = - log [H^{+}]\\conc. H^{+} = 0.0012 M$

The relation between pH and pOH value is as follows.

pH + pOH = 14

0.0012 + pOH = 14

pOH = 14 - 0.0012 = 13.99

Now, pOH is the negative logarithm of concentration of hydroxide ions.

Hence, $[OH^{-}]$ is calculated as follows.

$pOH = - log [OH^{-}]\\13.99 = - log [OH^{-}]\\conc. OH^{-} = 1.02 \times 10^{-14} M$

Thus, we can conclude that the value of $[H_{3}O^{+}]$ is 0.0012 M and $[OH^{-}]$ is $1.02 \times 10^{-14}$ .

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3 years ago

How many liters of chlorine gas can react with 56.0 grams of calcium metal at standard temperature and pressure? Show all of the

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The balanced chemical reaction is:

Ca + Cl2 = CaCl2

We are given the amount of calcium metal to be used for this reaction. This will be the starting point for the calculations.

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netineya [11]

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3 years ago

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amm1812

Answer:

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Biosphere

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puteri [66]

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