Question

some body plz solve this science question​

Answer 1

Answer:

1.

A mole fraction indicates the number of chemical elements. One mole of any substance is equal to the value of 6.023 x 1023 (Avagadro number).

2.The molecular mass is the mass of a given molecule: it is measured in daltons. Different molecules of the same compound may have different molecular masses because they contain different isotopes of an element.

3.Valency is the number of electrons at its outermost shell or its atomic charge, some elements have several charge like sulfur it has -2, +4, +6 And nitrogen +5 , -3 . ... The positive charge means how many electrons it wants to lose like sodium it has a charge of +1 so it wants to loses 1 electron.

4.Variable Valency. Certain elements combine with other atoms, donating, accepting or sharing electrons in different proportions depending on the nature of the reaction. For example, iron combines with oxygen to form ferrous oxide as well as ferric oxide. ... This is termed variable valency

5.a)Acidic radicals-Acidic radical are anions which are negatively charged. For example: SO42-, NO3¯, etc.

b)monovalent basic radicals-Basic Radicals are cations which are positively charged. For example: Na+, Fe++, etc

c)composite radicals-Composite radicals usually be found under methane, methyl, acetyl. Benzene, phenyl, or cyclohexane (for example, acetylimino, cyclohexanecarbonyl), but some other important examples as well as exceptions to the systematic rules are also listed.

Answer 2

$\huge\star\bold{Answer:-}$

[1] $No. of moles = \frac{Given\: mass}{Molar\: mass}$

[2] The molecular mass is the mass of a given molecule: it is measured in daltons.

The sum of the atomic masses of all atoms in a molecule, based on a scale in which the atomic masses of hydrogen, carbon, nitrogen, and oxygen are 1, 12, 14, and 16, respectively.

[3] The electrons present in outermost shell of an atom are called as valence electrons. The valence electron of an atom take part in a chemical reaction because they have more energy than all the inner electrons. The combining capacity of an atom of an element to form chemical bond is called its valency.

[4] Certain elements combine with other atoms, donating, accepting or sharing electrons in different proportions depending on the nature of the reaction. For example, iron combines with oxygen to form ferrous oxide as well as ferric oxide.This is termed variable valency.

[5] Acidic radicals => Hcl , H2SO4, KOH

Monovalent basic radicals => Na+, Ba2+, Fe3+

Composition radicals => alkyl, carbonyl, phenyl radicals