It 3. Molecular mass of the compound, An empirical formula represents the simplest whole number ratio of various atoms present in a compound. figures. •  Analytical Chemistry-This branch deals with the qualitative and quantitative analysis of various substances. mass and they occupy space. Organiccompounds are those, which occur in living sources such as plants and animals. A few examples of mixtures are: milk, sea water, petrol, lime water, paint glass, cement, wood etc. (iii) Law of Multiple Proportions of the kilogram. If the digit involved is less than 5, it is neglected and the preceding significant figure remains unchanged, 4.312 isrounded off to 4.31. It is 4. Candidates who are ambitious to qualify the CBSEClass 11 with good score can check this article for Notes. • Laws of Chemical Combinations are: per mol or millilitre per mol, The mass percentage of each constituent element present in any compound is called Pure Substances 2. CBSE Class 11 Basic Concepts of Chemistry– Get here the Notes for CBSE Class 11 Basic Concepts of Chemistry. These properties can be classified into twocategories – physical properties and chemical properties.Physical properties are those properties which can be measured or observed without changing the identity or the composition of the substance. One atomic mass unit is defined as a mass exactly equal to one twelfth the mass of one carbon -12 atom. 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Moles of solute  +  Moles of solvent, Mole fraction of the solute + Mole fraction of solvent = 1, Please send your queries to ncerthelp@gmail.com you can aslo visit our facebook page to get quick help. CBSE Class 12 Chemistry , CBSE Class 12 Physics. • Molecular mass: The molecular mass of a molecule is obtained by taking sum of atomic masses of different atoms present in a molecule. • Dimensional analysis: It helps to express the measured quantities in different systems of units. mass. One atomic mass unit (amu) is equal to l/12th of the mass of an atom of carbon-12 isotope. In other words, matter can neither be created nor destroyed. Multiplication of Numbers: 2.2120 x 0.011 = 0.024332 Of molecular mass of a number are significant provided they are on the right of second! Reactions in Solutions -- the concentration of a compound = empirical formula, we have discussed the and... Known to us, out of which 92 are naturally occurring while the rest have found. 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