1. • Balanced chemical equation: A balanced equation has the same number of atoms of each element on both sides of the equation. These Topper’s Class typed/scanned notes of Some Basic Concept of Chemistry Handwritten Notes in Pdf will help you to understand all key concepts. Anything which has mass and occupies space is called matter. For example, decomposition of mercuric oxide. Thus, formula mass of NaCl = Atomic mass of sodium + atomic mass of chlorine Since water contains hydrogen and oxygen, the percentage composition of both these elements can be calculated as follows: Metre: It is the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second. Limiting Reactant/Reagent The correct answer = 1.12 Chapter 1. Poisonous gases and chemicals are being constantly released in the atmosphere. There are two classifications of matter: physical and chemical. 4. 4 In a compound, constituents cannot be separated by physical methods VIEWS. Average Atomic Mass (iv) Gay Lussac’s Law of Gaseous Volumes 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. Its symbol is ‘mol’. Pure substances: A pure substance may be defined as a single substance (or matter) which cannot be separated by simple physical methods. It can vary -> Thermometres with Fahrenheit scale are calibrated from 32°F to 212°F. Free PDF download of Class 11 Chemistry revision notes & short key-notes for Chapter 12 - Organic Chemistry - Some Basic Principles and Techniques to score high marks in exams, prepared by expert Chemistry teachers from latest edition of CBSE(NCERT) books. The simplest whole number ratio of the atoms is 1:1 and the empirical formula is HO. www.free-education.in is a platform where you can get pdf notes from 6th to 12th class notes,… Volume: Volume means the space occupied by matter. Thus it … CBSE Class 11 Chemistry Notes : Basic Concepts of Chemistry. = 23.0 u + 35.5 u = 58.5 u. Cisplatin and taxol have been found to be very effective for cancer therapy and AZT (Azidothymidine) is used for AIDS victims. 3. (i) Inorganic Compounds: These are compounds which are obtained from non-living sources such as rocks and minerals. detergents, metal alloys and other inorganic and organic chemicals including new materials contribute in a big way to the national economy. Mole fraction It is an exponential notation in which any number can be represented in the form N x 10n where n is an exponent having positive or negative values and N can vary between 1 to 10. Ch 4: Chemical Bonding and Molecular Structure. Zeros at the end or right of a number are significant provided they are on the right side of the decimal point. Ch 5: States of Matter. E.g. Chapter 5. It has given units of all the seven basic quantities listed above. (B) Chemical Classification: 5, In a mixture, the constituents do not lose their identities i.e., a mixture shows the characteristics of all the constituents . Ch 3: Classification of Elements and Periodicity in Properties. • Units of Measurement Types of mixtures: Mixtures are of two types: It may be noted that the atomic masses as obtained above are the relative atomic masses and not the actual masses of the atoms. 5. (a) When matter undergoes a physical change. 4. Pure substances can be further classified as (i) Elements (ii) Compounds • Importance of Chemistry These are given below: -> Kelvin’scale of temperature is S.I. Mixtures. Reading Time: 11min read 0. Constituents of mixtures can be separated by physical methods. These are: “Some Basic Concepts of Chemistry” is the first chapter in the Class 11 Chemistry syllabus as prescribed by NCERT. Some basic laws and theories in chemistry such as Dalton’s atomic theory, Avogadro law, and the law of conservation of mass are also discussed in this chapter. For example, carbohydrates, proteins, oils, fats etc. The chemical equation is MCQ Questions for Class 11 Chemistry with Answers were prepared based on the latest exam pattern. Weight of substance may vary from one place to another due to change in gravity. The reactant which is not consumed completely in the reaction is called excess reactant. … (B) Chemical classification Some elements such as sodium . Examples: Na, K, Mg. Molality: It is defined as the number of moles of solute present in 1 kg of solvent. This reactant which reacts completely in the reaction is called the limiting reactant or limiting reagent. Some Basic Concepts of Chemistry Class 11 Revision Notes. But even if you are not, you must know some basic concepts of Chemistry. • Molecular Formula It is also known as unified mass. Video Lesson. Mole fraction: It is the ratio of number of moles of a particular component to the total number of moles of the solution. Moreover, the properties of a compound are altogether different from the constituting elements. These particles may be atoms or molecules. SI unit of mass is kilogram. (i) Calculation involving multiplication and division (ii) Calculation involving addition and subtraction: For these two operations, the first numbers are written in such a way that they have the same exponent. Weight is defined as the force exerted by the gravity on an object. Characteristics of liquids: Liquids have definite volume but not definite shape. Total number of the known elements is 118 out of which 98 elements occur naturally and 20 are formed by artificial transmutation. Chemical reactions involve reorganisation of atoms. I'm sure after learning these, you might become a fan of Chemistry. For example, book, pencil, water, air are composed of matter as we know that they have 4. Gases or copper contain single atoms held together as their constituent particles whereas in some others two or more atoms combine to give molecules of the element. Class 11 Chemistry handwritten Notes- Chapters Covered. Ch 6: Thermodynamics. It includes all the topics given in NCERT class 11 Chemistry text book. The different constituents of a heterogeneous mixture can be seen even with naked eye. (i) It has provided mankind with a large number of life-saving drugs. (iii) Law of Multiple Proportions Varähmihir’s Brihat Samhita gives references to perfumes and cosmetics. Division of Numbers: 4.2211÷3.76 = 1.12263 One can check the purity of a given sample by analysing this data. Kilogram: It is the unit of mass. In a mixture, or more elements or compounds are simply mixed and not combined chemically. It has greyish-yellow appearance and the two constituents, iron and sulphur, can be easily identified with naked eye. It is found that there is no change in weight though a physical change has taken place. Some Basic Concepts of Chemistry . Thermodynamics . FOR FREE DOWNLOAD . For example, • Scientific Notation Classification of Matter Chemistry is the branch of science that deals with the study of the composition, structure, properties of matter and changes it undergoes. Now let us see how calculations are carried out with numbers expressed in scientific notation. examples are: Common salt, marble, gypsum, washing soda etc. CBSE Class 11 Chemistry Notes are made strictly according to the NCERT Syllabus by our panel of highly experienced teachers. (ii) It has helped to protect the crops from insects and harmful bacteria, by the use ‘ of certain effective insecticides, fungicides and pesticides. 2. Ch 8: Redox Reactions. Solids 2. (i) Law of Conservation of Mass Some Basic Concepts of Chemistry Class 11 Notes- The chapter tells the importance of chemistry. These are stated below: All of them have been calibrated. • Addition and Subtraction of Significant Figures The value of n may be 1, 2, 3, 4, 5, 6 etc. • Laws of Chemical Combinations are: mass and they occupy space. In addition … Class 11 Chemistry Concepts of Chemistry: Mass & Weight: Mass & Weight. In a mixture the constituents are not present in fixed ratio. For example, in 285 cm, there are three significant figures and in 0.25 mL, there are two significant figures. • Stoichiometry: The quantitative study of the reactants required or the products formed is called stoichiometry. These include acidity, basicity, combustibility etc. CHEMISTRY NOTES FOR CLASS 11 CHEMISTRY DOWNLOAD IN PDF. • Significant Figures This number has been experimentally determined and found to be equal to 6.022137 x 1023 The value is generally called Avogadro’s number or Avogadro’s constant. There are certain rules for determining the number of significant figures. • Compounds are formed when atoms of two or more elements combine in a fixed ratio to each other. Avogadro’s Number, NA = 6.022 × 1023 Are you one of those who loves Chemistry? Share on Facebook Share on Twitter. Filed Under: Chemistry, Class 11, Some basic concepts of chemistry Tagged With: analgesics, antibiotics, antiseptic, chemistry, disinfectants, importance of chemistry, problems caused by progress in chemistry, synthetic fibres, tranquilizer. 1. The chapter touches upon topics such as the importance of chemistry, atomic mass, and molecular mass. In SI units, volume is expressed in metre3 (m3). (iii) A low concentration of chlorine i.e., 0.2 to 0.4 parts per million (ppm) is used ’ for sterilization of water to make it fit for drinking purposes. All non-zero digits are significant. (iii) The use of preservatives has helped to preserve food products like jam, butter, squashes etc. The mass of a substance is constant. Chapter 1: Some Basic Concepts of Chemistry; Chapter 2: Structure of Atom 1. The compounds have been classified into two types. For example, CNG (Compressed Natural Gas), a substitute of petrol, is very effective in checking pollution caused by automobiles. (ii) Law of Definite Proportions For example, • Avogadro number: The number of atoms, molecules or any other particles present in a given system are expressed in terms of Avogadro constant. 2. Some Basic Concepts of Chemistry Class 11 Notes Chapter 1 • Importance of Chemistry Chemistry has a direct impact on our life and has wide range of applications in different fields. Some other substances having tinting property were kamplcica, pattanga and jatuka. Candidates who are pursuing in the Class 11 are advised to solve the Question Paper and revised the notes from this post. For example, 2 balls or 20 eggs have infinite significant figures as these are exact numbers and can be represented by writing infinite number of zeros after placing a decimal. Characteristics of Gases: Gases have neither definite volume nor definite shape. The mass of a substance can be determined accurately in the laboratory by using an analytical NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. There are two ways of classifying the matter: (ii) Law of Definite Proportions (v) Avogadro’s Law If you have any Query or Doubt, Let us know in the comment sectionFollow us to stay updated with Education and Career related NewsFacebook | Twitter | Instagram| Youtube. BY JOYOSHISH SAHA. In the multiplication or division, the final result should be reported upto the same number of significant figures as present in the least precise number. 1. In such cases, the formula is used to calculate the formula mass instead of molecular mass. CBSE Guide Some Basic Concepts of Chemistry class 11 Notes. Mole: It is the amount of substance which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon -12. (B) In Health and Sanitation: • Percentage Composition Answers of assignment are given at the end of each assignment with complete solutions. 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. Assignment. Physicswallah Typed Notes. 4. Ionic compounds such as NaCl, KNO3, Na2C03 etc. (ii) Organic Compounds are the compounds which are present in plants and animals. (C) Saving the Environment: CHEMISTRY HANDWRITTEN NOTES CLASS 11 & 12 FOR NEET/JEE ASPIRANTS. (i) Elements: An element consists of only one type of particles. Temperature: There are three scales in which temperature can be measured. 2. (A) Physical Classification: Multiplication of Numbers: 2.2120 x 0.011 = 0.024332 (i) Law of Conservation of Mass The Shapes of Carbon Compounds: In organic or carbon compounds, s and p orbitals are involved in hybridisation. = 6.022 x 1023 (i) Skill and accuracy of the worker (ii) Limitations of measuring instruments. 1L = 1000 mL = 1000 cm3 = 1dm3. • All substances contain matter which can exist in three states — solid, liquid or gas. Their movement is easy and fast. Class 11th Chemistry – 1 Some Basic Concepts of Chemistry – Notes. These Some Basic Concept of Chemistry Handwritten Notes in Pdf will help you to prepare different competitive exams like GATE, PSUs and so on. 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