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3 years ago

The elements listed in the periodic table account

Chemistry

1 answer:

ddd [48]3 years ago

3 0

Answer:

Only 4 %

Explanation:

Just about 4 percent of the known universe overall mass consists of atomic nuclei and is therefore described by chemical components. This proportion is around 15 percent of the total mass, with dark energy becoming the majority of the material .

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88.5 mol of P4O10 contains how many moles of P?

ra1l [238]

This problem can be solved directly using stoichiometry. We can actually see that for every mol of P4O10, there are 4 moles of P. Therefore the total moles of P is:

moles P = 88.5 moles P4O10 * (4 moles P / 1 mole P4O10)

<span>moles P = 354 moles P</span>

3 0

4 years ago

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Which symbol in a chemical equation separates the reactants from the products?

andreev551 [17]

Answer:

B. →

Explanation:

This sign is used to show that the reactants yield the products, which also separates the two. Hope this helps and good luck on your assigment.

5 0

3 years ago

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When a certain powder is mixed into a solution of silver nitrate, a white precipitate forms. When the powder is added to a solut

atroni [7]

Answer:

Ammonium chloride

Explanation:

The powder is:- Ammonium chloride

When mixed with silver nitrate, white prescipitate of silver chloride is formed as:-

$NH_4Cl+AgNO_3\rightarrow NH_4NO_3+AgCl$

When mixed with sodium hydroxide, ammonia gas is formed which has noxious order.

$NH_4Cl +NaOH\rightarrow NH_3 + H_2O + NaCl$

Ammonia gas on reaction with nickel (II) hydroxide forms deep blue colored complex as shown below:-

$Ni(OH)_2(s) + 6NH_3(aq)\rightarrow [Ni(NH_3)_6]^{2+}(aq) + 2OH^{-}(aq)$

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3 years ago

The atoms of liquid Mercury are

KATRIN_1 [288]

Mercury atoms have 80 electrons and 80 protons with 122 neutrons in the most abundant isotope. Under standard conditions mercury is a shiny, heavy, silvery liquid. It is the only metal that is liquid at room temper

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3 years ago

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Lina20 [59]

Answer:

Please see attachment

Explanation:

Please see attachment

6 0

3 years ago