This is called factor label method or unit factor method or dimensional analysis. Physical Properties: Those properties which can be measured or observed without changing the identity or the composition of the substance. (i) Homogeneous mixtures: A mixture is said to be homogeneous if it has a uniform composition throughout and there are no visible boundaries of separation between the constituents. Similarly, the formula of glucose is C6H1206. Homoatomic molecules are made up of the atoms of the same element and heteroatomic molecules are made The examples of chemical properties are characteristic reactions of different substances. A mole represents a collection of 6.022 x1023( Avogadro’s number) chemical units..The mass of one mole of a substance in grams is called its molar mass. Filed Under: Chemistry, Class 11, Some basic concepts of chemistry Tagged With: Dimensional analysis, factor label method About Mrs Shilpi Nagpal Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. Based upon the composition, matter can be divided into two main types: CBSE Class 11 Chemistry , CBSE Class 11 Physics. Thus, hydrogen, nitrogen and oxygen gases consist of molecules in which two atoms combine to give the respective molecules of the element. rate of diffusion is very fast. = 16.043 u  then, 5 feet and 2 inch = 62 inch, 3. Moreover, the properties of a compound are altogether different from the constituting elements. The simplest whole number ratio of the atoms is 1:1 and the empirical formula is HO. Class 11 Chemistry Notes for Organic Chemistry Some Basic Principles and Techniques – Get here the Notes, Question & Practice Paper of Class 11 Chemistry for topic Organic Chemistry Some Basic Principles and Techniques. structure and properties of matter. 3. Therefore, gram molecular mass of oxygen = 32 g. Sum of atomic masses of the elements present in one formula unit of a compound. Their movement is easy and fast. (iii) Law of Multiple Proportions Candidates who are ambitious to qualify the CBSEClass 11 with good score can check this article for Notes. 2. of moles of the solute         = n It is found that one gram atom of any element contains the same number of atoms and one gram molecule of any substance contains the same number of molecules. (A) Physical classification It is expressed as (In 1811, Given by Avogadro) These notes are prepared keeping in mind the level of preparation needed by the students to prepare for Class 11 exams. Chemistry has played an important role in developing many industrially ^ manufactured fertilizers, alkalis, acids, salts, dyes, polymers, drugs, soaps, A few The word ‘stoichiometry’ is derived from two Greek words—Stoicheion (meaning element) and metron (meaning measure). Mole: It is the amount of substance which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon -12. molarity, the following equation is used: Some Basic Concepts of Chemistry Class 11 Notes are prepared by our panel of highly experienced teachers strictly according to the latest NCERT Syllabus on the guidelines by CBSE. Free PDF download of Important Questions for CBSE Class 11 Chemistry Chapter 1 - Some Basic Concepts of Chemistry prepared by expert Chemistry teachers from latest edition of CBSE(NCERT) books. All of them have been calibrated. The decimal place does not (A) Physical Classification: The amount of products formed then depends upon the reactant which has reacted completely. Average Atomic Mass We have discussed the physical and chemical classification of matter. •  Analytical Chemistry-This branch deals with the qualitative and quantitative analysis of various substances. So volume has units of m3  or cm3  or dm3.A common unit, litre (L) is not an SI unit, is used for measurement of volume of liquids. unit. within the volume, Not      rigid      and Inter  molecular •  Zeros at the beginning of a number are not significant. A 5 % (v/v) solution of ethyl alcohol contains 5 cm3 of alcohol in 100 cm3 of the solution, 3. Physical properties are those properties which can be measured or observed without changing the identity or the composition of the substance. Chemistry Class 11: Syllabus and Important Notes. known as fluid, They   can   diffuse JEE NEET Study Material : Notes , Assignment. (iv) Gay Lussac’s Law of Gaseous Volumes For example: When iron filings and sulphur powder are mixed together, the mixture formed is heterogeneous. According to this law equal volumes of gases at the same temperature and pressure should contain equal number of molecules. CHEMISTRY HANDWRITTEN NOTES CLASS 11 & 12 FOR NEET/JEE ASPIRANTS. per mol or millilitre per mol, The mass percentage of each constituent element present in any compound is called It has given units of all the seven basic quantities listed above. This law was proposed by Louis Proust in 1799, which states that: 4. as compared to the mass of an atom of C-12 taken as 12. In simple terms, atomic mass of an element expressed in grams is the gram atomic mass or gram atom. (ii) Heterogeneous mixtures: A mixture is said to be heterogeneous if it does not have uniform composition throughout and has visible boundaries of separation between the various constituents. Ancient Indians had knowledge of various concepts from chemistry even before it emerged as a … For example, a molecule of carbon dioxide is 44 times heavier than 1/12th of the mass of an atom of carbon. (i) Law of Conservation of Mass • Stoichiometry: The quantitative study of the reactants required or the products formed is called stoichiometry. Using stoichiometric calculations, the amounts of one or more reactants required to produce a particular amount of product can be determined and vice-versa. It e.g.H2(g) + Cl2(g) ---→2HCl(g) (A) In Agriculture and Food: Characteristics of Gases: Gases have neither definite volume nor definite shape. •  In  exponential  notations,  the  numerical  portion  represents  the  number  of significant figures. of the kilogram. • Addition and Subtraction of Significant Figures The rounding off procedure is applied to retain the required number of significant 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. In such cases, the formula is used to calculate the formula mass instead of molecular mass. negative values) are possible in Celsius scale but in Kelvin scale, negative temperature is not possible. The chemistry class 11 syllabus aims to give the students an overall picture of what fundamentals of higher chemistry look like. 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