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3 years ago

5

What is the electron configuration of the element in period 2 that has 5 valence electrons (valence electrons are the electrons

in the outermost shell) *

1 answer:

balu736 [363]3 years ago

8 0

Answer:

Nitrogen

Explanation:

N= is the symbol

electronic configuration

1s2 2s2 2p3

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The two classifications of all chemicals are organic and salts. <br> a. True<br> b. False

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Chemicals are never classified all depends upon it's physical and chemical properties so the answer is FALSE

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Read 2 more answers

How many molecules are in 1.2 moles of H20?

Otrada [13]

<h3>Answer:</h3>

7.226 × 10^23 molecules.

<h3>Explanation:</h3>

A compound is a substance that is made by two or more atoms from different elements.

A mole of a compound contains a number of molecules equivalent to Avogadro's number, 6.022 × 10^23.
That is, one mole of a compound contains 6.022 × 10^23 molecules.

In this case we are given;

Number of moles of H₂O as 1.2 moles

But, 1 mole of H₂O contains 6.022 × 10^23 molecules.

We are required to calculate the number of molecules present;

To calculate the number of molecules we are going to multiply the number of molecules in one mole by the number of moles.

Therefore;

Number of molecules = 1.2 moles × 6.022 × 10^23 molecules/mole

= 7.226 × 10^23 molecules.

Thus, 1.2 moles of water contains 7.226 × 10^23 molecules.

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3. What is the pairing arrangement of the nitrogenous bases? _____________ pairs with __________ and ____________ pairs with ___

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Balance the following reactions and identify the species that have been oxidized and the species that have been reduced.

marin [14]

Answer:

Balance the following reactions and identify the species that have been oxidized and the species that have been reduced.

CL2 +I- -------------> I2 +CL-

WO2 + H2 ---------------> W + H2O

CA + H2O -----------------> H2 + CA(OH)2

AL+ O2 --------------------> AL2O3

Explanation:

Oxidation is the process where an atom loses electrons.

During oxidation, the oxidation number of the atom increases.

Reduction is the process where an atom gains electrons.

During reduction, the oxidation number of the atom decreases.

The balanced chemical equations for the given reactions are shown below:

$Cl_2 +2I^- -> I_2 + 2Cl^-$

Iodine undergoes oxidation and chlorine undergoes reduction.

$WO_2 +2 H_2 -> W+ 2 H_2O\\$

In this reaction, W (tungsten) undergoes reduction and hydrogen undergoes oxidation.

$Ca+2 H_2O ->H_2+Ca(OH)_2\\$

Ca undergoes oxidation and hydrogen undergoes reduction.

$4Al+3O_2->2Al_2O_3\\$

Al undergoes oxidation and oxygen undergoes reduction.

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3 years ago