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  Some Basic concepts  of Chemistry  #13 Avogadro's Number : The number of particles in one mole of a substance  is known as Avogadro's number.it is equal to  6.023 × 10²³ Mole concept.  Mole : the amount of any substance which contains 6.023 × 10²³ number of atoms or molecules or ions etc. is called one mole. • thus a mole is a unit of counting particles such as molecules, atoms, ions, electrons,  protos, etc, thus we can say that  ---

Some Basic Concepts of chemistry  #12 to watch in hindi explanation👆👆 https://youtu.be/ePw5eg9Vf4o Avogadro's Hypothesis: "Under the same conditions of temperature and pressure, equal volumes of all gases contain the same number of molecules. "  Avogadro's Hypothesis 

some basics concepts of chemistry #11 Must subscribe this channel 👆👆 Molecule: a molecule is the ultimate particle of an elements or compound which can  exist in free state and possesses all characteristic  properties of that substance. Atom:   An atom is the ultimate particle of an element of an element which can take part in a chemical reaction.  Atom          Molecules are of  two  types 1. Elementary                       2. Compound  1. Elementary molecules are  composed of atoms of same elements,  e.g., hydrogen(H 2 )  chlorine(Cl 2 )...  etcetera  Oxygen (O 2 ) 2. Compound molecules are composed of atoms of more than one type of element   e.g., HCL, CO 2 ,  NH 3  ... etcetera  NH 3  molecules  Note:  The Atoms of noble gases and  metals can exist in free state.

some Basics concepts of chemistry  #10 Modern Atomic theory. 👇👇To watch video hindi lecture. 👇👇 https://youtu.be/GtoszO3Mm9Q The main points of modern atomic theory are--- (1)  According to modern atomic theory, An Atom is no longer indivisible. ---Atom is composed of number of subatomic particles of which protons, electrons and neutrons are important. (2). Atom of the same elements may not be Identical in mass.  After the discovery of Isotopes  has been proved that Atoms of same elements may have Atoms of different  masses. e.g    (3). Atom of different elements usually combine together in a fixed simple whole number  to form molecules,  But several of compounds are known in which atoms do not combine together in a fixed simple whole number ratio, called non-stoichiometric compound.  e.g FeO 0.93 (4).Atoms are no longer considered indestructible.

  Some Basic  concepts of chemistry  #09 To watch video  https://youtu.be/IR-2s_w6kEY Postulates of Dolton's atomic theory : 1. Matter is composed of a large number of minute discrete particles Called Atoms 2. Atoms can neither be created nor be destroyed in a physical change or chemical reactions.  3. Atoms of the same element are Identical with each other in mass, size,  shape, and other properties.  4. Atoms  of different elements are different in all respects  i.e, they differ in mass, size, shape and properties.  5. when atoms of different elements combine with  one another to form  a compound Atom ( later on called molecules),  they do so in simple whole number ratios. Limitations of Dolton's Atomic theory: Atom is no longer considered to be  indivisible.  It has now  been proved that an atom is composed of smaller particles like electrons, protons,  neutrons, positrons  etcetera. Also  ...

Some Basic concepts of chemistry  #08 Gay Lussac's law of gaseous volumes:       " when gases react together to form gaseous chemical compound,  the volumes of the reacting gases and those of the products bear a simple ratio of whole numbers to one another, measured under the same conditions of temperature and pressure.  it is known as the Law of combining volumes of gases." To watch video👇👇👇 https://youtu.be/MR29Hzk-fes e.g

some basic  concepts  of chemistry #07 Laws of chemical combination. 4 . The law of reciprocal or equivalent proportions:   It's stated as    " The ratio in which two elements combine separately with a fixed mass of the third element is either the same or is a simple whole number multiple of the ratio in which these elements combine with each other." let's understand this law simply, that the ratio of masses of B and C which combine separately with a fixed mass of third element A, is either the same as or some simple multiple  of the ratio of masses of B and C combine with each other. 

 Some Basic concepts of chemistry  #06 law of chemical combination  3.  Law of multiple proportions:  the law states that--        "when two elements combine to form two or more compounds,  the different masses of one of the elements, which combine with a fixed mass of the other elements, bear a simple ratio of whole numbers to one another."  To watch lecture https://youtu.be/SCTVr1woAjU  example👇👇👇 Limitations: the law of multiple proportions doesn't  apply to such compounds, e.g in butane( C 4 H 10 ), pentane (C 5 H 12 ) and hexane(C 6 H 14 ), it is found that 12 parts by mass of carbon in each case combine with 2.5 : 2.4 : 2.33 parts by mass of hydrogen respectively.  The mass ratio of hydrogen is not bear a simple ratio. 

Some basic concepts of chemistry #05   Law of chemical Combination.  2. Law of definite or constant proportions : it's states that ,   "  The same compound always contains the same elements combined together in the same fixed (definite) proportion by mass and its composition is independent of the method by which it is prepared. "   To understand this law simply, you have to remember the things that is  - No matter what is  the source of the compound, rather it matter only about the elements of the compound. yess dude😂😂, there is also limitations of the law of constant proportions. Limitations:-    let's see the  example,  ethyl alcohol and dimethyl ether are found to contain the same elements( like carbon, hydrogen,  and oxygen) which are combined in the same mass ratio.        C 2 H 5- OH  👉👉👉        C:H:O = 12:3:8        CH 3 -O-CH 3  👉👉👉  ...

Some basic concepts of chemistry  #04 Laws of  chemical combination . Law of conservation of mass :   It states  that,    " Matter can neither be created nor destroyed as a result of any chemical or physical  change "            but this law  is not absolutely true,  there is limitations of the law of conservation  of mass. Limitations :   according to modern theory of Radiation, the thing is  mass and energy are inter convertible  according to einstein equations ( E=mc²).           A  chemical reaction which is accompanied by an emission of energy  usually in the form of heat, will be attend with loss of mass=E/c².   As c is very large, the loss of mass becomes insignificantly small. thus the law of conservation of mass holds good for ordinary chemical reactions.  but in nuclear fission/fusion enormous amounts of energy  is...

  M i x t u r e Comp ound     (1)   A mixture results when two or more  elements or compound or both  are mixed in any proportion  by mass.  (1)  In a compound the ingredients are present in a fixed proportion by mass.   (2)  A mixture the ingredients  may lose their physical properties but chemical properties remains same.  (2) The chemical properties of the constituents are totally changed, and new properties  are developed.    (3) A mixture may be homogeneous or heterogeneous.   (3) A compound  is always homogeneous.    (4) During the preparation of mixture, thermal change may or may not occur.  (4)  During the formation of compound,  there is always a thermal change.   https://youtu.be/v1I3wi3lBYk          watch on YouTube to understand                 I know you guys  so...

Some Basic concepts of chemistry  #02 From chemical classification of matter point of view:-  to watch, tap 👉👉  https://youtu.be/r24jhgNLC4c     (a) Element                                            (b) Compound          The Elements Can further  be classified As follows:- Metal :  A metal is defined as elements which are typically hard, lustrous, ductile, malleable, with good electrical and thermal conductivity. e.g, Iron (fe), gold(Au), silver(Ag), etcetera.  Non-metal :   A Non-metal is defined as Elements which do not possess lustre (except Iodine), poor conductor of heat and electricity (except graphite), and are brittle.  e.g, sulpher(S), carbon(C), etcetera  Metalloid/ semi-metal :  The Elements which exhibits more or less the properties of both metals and no-metals, is called metalloi...

Basic Concept Of chemistry.  #01 Anything that occupies space, and having mass and inertia is called Matter. classification of matter:- [A] physical classification        [B] chemical classification [A] physical classification:- Solid state :    In solid state, matter has definite shape and definite volume.  e.g, metal, salt, suger etcetera  Solid state Liquid  state : In liquid state, matter does not have definite shape but  have definite volume. e.g, water, milk, oil, etcetera  Gaseous state : In gaseous state,  matter does not have a definite volume or definite shape. It can be compressed and takes the shape of container where it is kept.   e.g, hydrogen, oxygen,  etcetera  https://youtu.be/olxIcjnwFNE