Question

hii guya plz tell fast
define following
(1) law of conservation of mass
(2) law of constant proportion
(3) atom
(4) molecule
(5) atomicity
(6) relative atomic mass
(7) relative molecular mass
(8) one a.m.u
(9) one mole
(10) valency
(11) electro valency
(12) covalency
(13) polyatomic ion
(14)cation
(15) anion
(16) formula mass
(17) chemical formula
(18) molar mass

Answer 1

1.The law of conservation of mass or principal of mass conservation states that for any system closed to all transfers of matter and energy.
2.law of constant composition states that a given chemical compound always contains it's component elements in fixed ratio and does not depend on its source and method of preparation.
3.An atom a fundamental piece of matter.
4.molecule is the smallest particle in chemical compound that has the chemical properties of that element.
5.The number of atoms in the molecules of an element.
6.The ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon 1-2
7.the ratio of the average mass of one molecule of an element to one twelfth of the mass of an atom of carbon 1-2.
8.A unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon 1-2.
9.one mole is defined as the amount of substance containing as many elementary entities.
10.the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with.
11.The valence of an ion,equal to the number of positive and negative charges acquired by an atom through a loss or gain of electrons.
12.covalency is a valence characterized by the sharing of electrons in a chemical compound,the number of pairs of electrons an atom can share.
13.A polyatomic ion,also known as a molecular ion,is a charged chemical species composed of two or more atoms covalently bonded or of metal complex that can be considered to be acting as a single unit.
14.A positively charged ion,i.e.one that would be attracted to the cathode in electrolysis.
15.A negatively charged ion,i.e.one that would be attracted to the anode in electrolysis.
16.Formula mass is the sum of the atomic weights of atoms in a molecule.
17.A mathematical relationship or rule expressed in symbols.
18.In chemistry,the molar mass M is a physical property defined as the mass of a given substance divided by the amount of substance

Hope it helps u...
mark me as brainlist


please...

Answer 2

$\underline\bold\pink{\huge{HELLo\:DEAR?}}$

1) This law was given by Antoni Lavoisier in 1774. According to this law matter is neither created nor destroyed in a chemical reaction.

2)This Law was given by Joseph Proust in1779. According to this law- A chemical compound always consists of the same element combined together in the same proportion by mass.

3)An atom is the smallest partical of an element that can take part in a chemical reaction.

4)The group of two or more atoms which are chemically bounded by each other is called molecules.

9) mole is a link between the mass of atoms and the number of atoms.

1mole= 6.022×10^23

10) The no. of electrons of an element which takes part in a chemical reaction is called valency.

11) The no. of electrons present in the outermost orbit of an element is called valence electrons or electronic valency.

12)Valency characterized by the sharing of electrons in a chemical compound.

13)Two atoms are commonly refferd to as polyatomic.

$<b>[\tex][tex]$ i hope it's helps you..⭐❤⏪✌