Chapter 5. For example, carbohydrates, proteins, oils, fats etc. (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. Chapter 2. 2. The rapid industrialisation all over the world has resulted in lot of pollution. 5. Characteristics of liquids: Liquids have definite volume but not definite shape. Ch 5: States of Matter. 55. These are stated below: Chemical reactions involve reorganisation of atoms. of the kilogram. Ch 7: Equilibrium. Chapter 6. Are you one of those who loves Chemistry? • Significant Figures (b) When matter undergoes a chemical change. … (iv) Gay Lussac’s Law of Gaseous Volumes 3. The different constituents of a heterogeneous mixture can be seen even with naked eye. Candela: It may be defined as the luminous intensity in a given direction, from a source which emits monochromatic radiation of frequency 540 x 1012 Hz and that has a radiant intensity in that direction of 1/ 683 watt per steradian. One atomic mass unit (amu) is equal to l/12th of the mass of an atom of carbon-12 isotope. scale and is very common these days.Temperature on this scale is shown by the sign K. In a mixture the constituents are not present in fixed ratio. Mixtures This article has highlighted some basic concepts of chemistry in the form of notes for class 11 students in order to understand the chapter with ease. (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. Thus, 232.508 can be written as 2.32508 x 102 in scientific notation. Mixtures. Stoichiometry, thus deals with the calculation of masses (sometimes volume also) of the reactants and the products involved in a chemical reaction. • Percentage Composition 7. Density: Density of a substance is its amount of mass per unit volume. VIEWS. Molecular mass is the sum of atomic masses of the elements present in a molecule. “Some Basic Concepts of Chemistry” is the first chapter in the Class 11 Chemistry syllabus as prescribed by NCERT. Multiplication of Numbers: 2.2120 x 0.011 = 0.024332 0. (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. Ch 1: Some Basic Concepts of Chemistry. • All substances contain matter which can exist in three states — solid, liquid or gas. • Laws of Chemical Combinations (A) Physical Classification: (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. 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. 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. colour, odour, melting point, boiling point, density etc.The measurement or observation of chemical properties requires a chemical change occur. For example, molecular formula of hydrogen peroxide = H202and Glucose = C6H1206 1. • Units of Measurement In addition … • Importance of Chemistry It is the branch of science which deals with the composition, structure and properties of matter. 4. are some examples of elements. (ii) Law of Definite Proportions We have discussed the physical and chemical classification of matter. (v) Avogadro’s Law. These particles may be atoms or molecules. Organic Chemistry Some Basic Principles and Techniques Chemistry Chapter 12 • Organic Chemistry Organic chemistry is the branch of chemistry that deals with the study of hydrocarbons and their derivatives. (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 . CompoUnds are always homogeneous i.e., they havethe same composition throughout. Video Lesson. (i) Law of Conservation of Mass During the above decomposition reaction, matter is neither gained nor lost. SI unit of mass is kilogram. Click here. A balanced equation for this reaction is as given below: For example, The formula of a compound which gives the actual ratio of the atoms of various elements present in one molecule of the compound. Let us consider the combustion of methane. Click here. The temperature on two scales are related to each other by the relationship • Properties of Matter and Their Measurements Examples: Na, K, Mg. One can check the purity of a given sample by analysing this data. Cisplatin and taxol have been found to be very effective for cancer therapy and AZT (Azidothymidine) is used for AIDS victims. Join Our Telegram Channel... Users. Kilogram: It is the unit of mass. MCQs. It includes all the topics given in NCERT class 11 Chemistry text book. (C) Saving the Environment: RD Sharma Class 11 Solutions Free PDF Download, NCERT Solutions for Class 12 Computer Science (Python), NCERT Solutions for Class 12 Computer Science (C++), NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Micro Economics, NCERT Solutions for Class 12 Macro Economics, NCERT Solutions for Class 12 Entrepreneurship, NCERT Solutions for Class 12 Political Science, NCERT Solutions for Class 11 Computer Science (Python), NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Entrepreneurship, NCERT Solutions for Class 11 Political Science, NCERT Solutions for Class 11 Indian Economic Development, NCERT Solutions for Class 10 Social Science, NCERT Solutions For Class 10 Hindi Sanchayan, NCERT Solutions For Class 10 Hindi Sparsh, NCERT Solutions For Class 10 Hindi Kshitiz, NCERT Solutions For Class 10 Hindi Kritika, NCERT Solutions for Class 10 Foundation of Information Technology, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 9 Foundation of IT, PS Verma and VK Agarwal Biology Class 9 Solutions, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, Periodic Classification of Elements Class 10, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10. Liquids: In liquids, the particles are close to each other but can move around. • Mixtures: Many of the substances present around us are mixtures. (iii) Law of Multiple Proportions It has greyish-yellow appearance and the two constituents, iron and sulphur, can be easily identified with naked eye. Let's learn about what Chemistry actually is and it's basic concepts that will help you understand Chemistry … • Element: An element contains particles of only one type which may be atoms or molecules. These are known as Celsius scale (°C), Fahrenheit scale (°F) and Kelvin scale (K). Class 11 Chemistry Printed Notes will be provided in by Speed Post. CBSE Class 11 Chemistry Notes are made strictly according to the NCERT Syllabus by our panel of highly experienced teachers. • Dimensional Analysis States of Matter . Kelvin: It is the unit of thermodynamic temperature and is equal to 1/273.16 of the thermodynamic temperature of the triple point of water. (i) Calculation involving multiplication and division 3. 2. • Uncertainty in Measurements It can vary Volume of liquids can be measured by different devices like burette, pipette, cylinder, measuring flask etc. Refer the revision notes to shine in Chemistry. • Mole Concept The chemical equation is Also, it studies the properties and structure of substances. • Compounds are formed when atoms of two or more elements combine in a fixed ratio to each other. These are given below: Mole: It is the amount of substance which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon -12. 2. • Definitions of Basic SI Units Some Basic Concepts of Chemistry . Notes will be delivered asap. Similarly, the formula of glucose is C6H1206. (ii) Compounds: It may be defined as a pure substance containing two or more elements combined together in a fixed proportion by weight and can be decomposed into these elements by suitable chemical methods. You can practice the questions and check your answers from the solutions given after question. By practicing this resources candidates definitely get the idea of which his/her weak areas and how to prepare well for the examination. Pure Substances 2. Class 11 Chemistry Notes for Some Basic Concepts of Chemistry – Get here the Notes, Question & Practice Paper of Class 11 Chemistry for topic Some Basic Concepts of Chemistry. balance. About Mrs Shilpi Nagpal Formula Mass Avogadro’s Number, NA = 6.022 × 1023 The method used to accomplish this is called factor label method or unit factor method or dimensional analysis. What do you understand by Some Basic Concepts of Chemistry? Thus, 2.005 has four significant figures. 4. • Atomic Mass In all physical and chemical changes, the total mass of the reactants is equal to that of the products. Metre: It is the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second. Most of the elements exist as isotopes which are different atoms of the same element with different mass numbers and the same atomic number. In 1808, Dalton published ‘A New System of Chemical Philosophy’ in which he proposed the following: Chemical Bonding and Molecular Structure. 3. To get fastest exam alerts and government job alerts in India, join our Telegram channel. Candidates who are pursuing in the Class 11 are advised to solve the Question Paper and revised the notes from this post. Class 11 Chemistry notes on Chapter 1 Some Basic Concepts of Chemistry class 11 Notes Chemistry are also available for download in CBSE Guide website. These include acidity, basicity, combustibility etc. Solids: The particles are held very close to each other in an orderly fashion and there is not much freedom of movement. For example, in 285 cm, there are three significant figures and in 0.25 mL, there are two significant figures. The mass of a substance can be determined accurately in the laboratory by using an analytical (B) In Health and Sanitation: Weight of substance may vary from one place to another due to change in gravity. (i) Law of Conservation of Mass Pure substances can be further classified as (i) Elements (ii) Compounds When the reactions are carried out in solutions, the amount of substance present in its given volume can be expressed in any of the following ways: All non-zero digits are significant. For example, 0.03 has one significant figure and 0.0052 has two significant figures. Subtraction of numbers can be done in the same way as the addition. A pure chemical compound always consists of the same elements combined together in a fixed proportion by weight. We have provided Some Basic Concepts of Chemistry Class 11 Chemistry MCQs Questions with Answers to help students understand the concept very well. 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