It expresses as to how many times the molecule of a substance is heavier than 1/12th of the mass of an atom of carbon. (iv) Law of Gaseous Volume (Gay Lussac’s Law) The SI system has sevenbase units, Mass and Weight-- Mass of a substance is the amount of matter present in it while weight is the force exerted by gravity on an object. For example, 16.0 has three significant figures, while 16.00has four significant figures. then, 5 feet and 2 inch = 62 inch, 3. Constituents of mixtures can be separated by physical methods. 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For example- 5 feet and 2 inches (height of an Indian female) is to converted in SI 3. For example, e.g., the molecular mass of oxygen = 32 amu Chemistry Notes , Chemistry Assignment , Chemistry Quiz , NCERT Solution It is usually represented by NA: Molality is expressed as ’m’. There are two ways of classifying the matter: e.g. (a) Combination between hydrogen and chlorine: have the same composition throughout the sample. Volume percent is the number of units of volume of the solute per 100 units of the volume of solution. Chemistry Notes , Chemistry Assignment , Chemistry Quiz , NCERT Solution 7. have been prepared artificially. 3. Some other substances having tinting property were kamplcica, pattanga and jatuka. • All non-zero digits are significant. Weight of substance may vary from one place to another due to change in gravity. For example, decomposition of mercuric oxide. Chemical Properties: It requires a chemical change to occur. The different constituents of a heterogeneous mixture can be seen even with naked eye. Some examples of physical properties are colour, odour, melting point, boiling point etc. • Element: An element contains particles of only one type which may be atoms or molecules. = 16.043 u • Stoichiometry: The quantitative study of the reactants required or the products formed is called stoichiometry. The formula of the compound which gives the simplest whole number ratio of the atoms of yarious elements present in one molecule of the compound. Characteristics of Gases: Gases have neither definite volume nor definite shape. • All substances are made up of tiny, indivisible particles called atoms.Atoms of the same element are identical in shape, size, mass and other properties. Therefore, gram molecular mass of oxygen = 32 g. Sum of atomic masses of the elements present in one formula unit of a compound. Class 11 - Chemistry Video Lectures by DronStudy.com. SOME BASIC CONCEPTS OF CHEMISTRY 3 A number of classical texts, like Atharvaveda (1000 BCE) mention some dye stuff, the material used wer e tur meric, madder, sunflower , orpiment, cochineal and lac. 4. The mass of a substance can be determined accurately in the laboratory by using an analytical Mole is defined as the amount of a substance, which contains the same number of chemical units (atoms, molecules, ions or electrons) as there are atoms in exactly 12 grams of pure carbon-12. (B) In Health and Sanitation: This leads to y three types of [â¦] 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. In all physical and chemical changes, the total mass of the reactants is equal to that of the products. E.g. Mixtures: The combination of two or more elements or compounds which are not chemically combined together and may also be present in any proportion, is called mixture. 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. 2. These notes are prepared keeping in mind the level of preparation needed by the students to prepare for Class 11 exams. A balanced equation for this reaction is as given below: In 1808, Dalton published ‘A New System of Chemical Philosophy’ in which he proposed the following: do not consist of molecules i.e., single entities but exist “as ions closely packed together in a three dimensional space as shown in -Fig. Zeros at the end or right of a number are significant provided they are on the right side of the decimal point. The law was established by a French chemist, A. Lavoisier. known as fluid, They can diffuse per mol or millilitre per mol, The mass percentage of each constituent element present in any compound is called • Laws of Chemical Combinations are: In simple terms, atomic mass of an element expressed in grams is the gram atomic mass or gram atom. Inorganic compounds are those, which areobtained from non-living sources such as minerals. For example, 0.03 has one significant figure and 0.0052 has two significant figures. 8.375 is rounded off to 8.38 while8.365 is rounded off to 8.36. • Addition and Subtraction of Significant Figures Physics Chemistry à¤°à¤¾à¤¸à¥à¤¤à¥ à¤¬à¤¦à¤²à¥ à¤ªà¤° à¤®à¤à¤à¤¼à¤¿à¤² à¤¨à¤¹à¥à¤ CBSE Class 11 Chemistry , CBSE Class 11 Physics CBSE Class 12 Chemistry , CBSE Class 12 Physics JEE NEET Study Material : Notes , Assignment Physics Notes , Physics Assignment , Physics Quiz , HC Verma Solution , NCERT Solution Chemistryâ¦ Read more It is also known as unified mass. However, atoms of different elements are different in nature. We have discussed the physical and chemical classification of matter. Molecular mass is the sum of atomic masses of the elements present in a molecule. Class 11 Chemistry Chapter 1 notes are compiled by subject experts in compliance with the updated syllabus provided by CBSE.These notes for Class 11 Chemistry, are available online as free PDF downloads. According to this law equal volumes of gases at the same temperature and pressure should contain equal number of molecules. Mathematically, One atomic mass unit (amu) is equal to l/12th of the mass of an atom of carbon-12 isotope. For example, • Inorganic Chemistry-This branch deals with the study of compounds of all other elements except carbon. • Molecular mass: The molecular mass of a molecule is obtained by taking sum of atomic masses of different atoms present in a molecule. (C) Saving the Environment: 5. One mole of all gaseous substances at 273 K and 1 atm pressure occupies a volume equal to 22.4 litre or 22,400 mL. 2. (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. 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. Download Handwritten Notes on all the topics of Class XI Chemistry. Counting numbers of objects. • Differences between Compounds and Mixtures • Atom is the smallest unit that takes part in chemical combinations. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. The examples of chemical properties are characteristic reactions of different substances. 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. The quantity of an element whose mass in grams is numerically equal to its atomic • Matter Get Some Basic Concepts of Chemistry, Chemistry Chapter Notes, Questions & Answers, Video Lessons, Practice Test and more for CBSE Class 10 at TopperLearning. The mass of a substance can be determined very accurately by using an analytical balance, Volume-- Volume has the units of (length)3. Law of Definite Proportions or Law of Constant Composition: (ii) Disinfectants such as phenol are used to kill the micro-organisms present in drains, toilet, floors etc. SOME BASIC CONCEPTS OF CHEMISTRY. In terms of weight, molarity of the substance can be expressed as: To calculate the volume of a definite solution required to prepare solution of other The rapid industrialisation all over the world has resulted in lot of pollution. Chemical properties are characteristic reactions of different substances; these include acidity or basicity, combustibility etc.Many properties of matter such as length, area, volume, etc., are quantitative in nature. consist of two or more parts (phases), which have different compositions. molarity, the following equation is used: (i) Law of Conservation of Mass balance. (i) Skill and accuracy of the worker (ii) Limitations of measuring instruments. Compounds In simple terms, molecular mass of a substance expressed in grams is called gram molecular mass. Kilogram: It is the unit of mass. The law states that, under similar conditions of temperature and pressure, whenever gases combine, they do so in volumes which bear simple whole number ratio with each other and also with the gaseous products. Avogadro’s Number, NA = 6.022 × 1023 Hence, a convenient system of expressing the number in scientific notation is used. 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Thus, hydrogen, nitrogen and oxygen gases consist of molecules in which two atoms combine to give the respective molecules of the element. The smallest particle of an element, which may or may not have independent Moreover, the properties of a compound are altogether different from the constituting elements. Register online for Chemistry tuition on Vedantu.com to score more marks in your examination. (iii) Law of Multiple Proportions 1. In other words, matter can neither be created nor destroyed. • Mole Concept Free NCERT Solutions for Class 11 Chemistry Chapter 1 Some basic Concepts of Chemistry solved by expert teachers from latest edition books and as per NCERT (CBSE) guidelines.Class 11 Chemistry Some basic Concepts of Chemistry NCERT Solutions and Extra Questions with Solutions to help you to revise complete Syllabus and Score More marks. Chemistry Class 11: Syllabus and Important Notes. Often while calculating, there is a need to convert units from one system to other. 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