After that, the coefficients are added or subtracted as the case may be. 3. These properties can be classified into two 2. Often while calculating, there is a need to convert units from one system to other. These questions cover all the important topics and are designed exclusively for students exam preparation. 8.375 is rounded off to 8.38 while8.365 is rounded off to 8.36. Density: Density of a substance is its amount of mass per unit volume. known as fluid, They   can   diffuse unit. The value of n may be 1, 2, 3, 4, 5, 6 etc. (b) When matter undergoes a chemical change. 2. 4. In addition or subtraction of the numbers having different precisions, the final result should be reported to the same number of decimal places as in the term having the least number of decimal places. • Classification of Matter 1. colour, odour, melting point, boiling point, density etc.The measurement or observation of chemical properties requires a chemical change occur. • Physical  Chemistry-The  explanation  of  fundamental  principles  governing various chemical phenomena is the main concern of this branch. 1. For example, (i) Inorganic Compounds: These are compounds which are obtained from non-living sources such as rocks and minerals. (B) Chemical classification • Compounds are  broadly classified  into  inorganic and  organic  compounds. Mass % of the element=Mass of element in 1 molecule of the compound    x 100 The quantity of an element whose mass in grams is numerically equal to its atomic Atomic mass of an element is defined as the average relative mass of an atom of an Similarly, the formula of glucose is C6H1206. Mass percent: It is obtained by using the following relation: The final result has two decimal places but the answer has to be reported only up to one decimal place, i.e., the answer would be 12.0. In simple terms, atomic mass of an element expressed in grams is the gram atomic mass or gram atom. • Matter Subtraction of numbers can be done in the same way as the addition. element as compared to the mass of an atom of carbon -12 taken as 12. Mixtures. • For example, the number 345601 has sixsignificant figures but can be written in different ways, as 345.601 or 0.345601 or 3.45601 all having same number It is usually represented by NA: 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. • Mixtures: Many of the substances present around us are mixtures. Temperature: There are three scales in which temperature can be measured. The final result has four decimal places. The mass of a substance can be determined accurately in the laboratory by using an analytical In a compound, the constituents lose their identities i.e., i compound does not show the characteristics of the constituting elements. • Percentage Composition All the atoms of a given element have identical properties including identical 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. These are given below: (A) In Agriculture and Food: (i) It has provided chemical fertilizers such as urea, calcium phosphate, sodium nitrate, ammonium phosphate […] One atomic mass unit is defined as a mass exactly equal to one twelfth the mass of one carbon -12 atom. 1. Molarity: It is defined as the number of moles of solute in 1 litre of the solution. Characteristics of liquids: Liquids have definite volume but not definite shape. -> Thermometres with Fahrenheit scale are calibrated from 32°F to 212°F. In a mixture, or more elements or compounds are simply mixed and not combined chemically. Mole: It is the amount of substance which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon -12. The rounding off procedure is applied to retain the required number of significant Molecular Mass up of the atoms of the different element have different atomicity (number of atoms in a molecule of an element) like monoatomic, diatomic, triatomic and polyatomic. = 12.011 u + 4 (1.008 u) The ratio is = 1 : 2 : 1 The empirical formula of glucose = CH20 It is found that there is no change in weight though a physical change has taken place. (C) Saving the Environment: Therefore the molecular mass of CO2 is 44 amu. 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. These are given below: For example, 0.03 has one significant figure and 0.0052 has two significant figures. It states that matter (mass) can neither be created nor destroyed. Multiplication of Numbers: 2.2120 x 0.011 = 0.024332 • Significant Figures Copyright @ ncerthelp.com A free educational website for CBSE, ICSE and UP board. Chapter 1 Some Basic Concepts Of Chemistry, Chapter 3 Classification of Elements And Periodicity In Properties of Elements, Chapter 4 Chemical Bonding And Molecular Structure, Chapter 12 Organic chemistry : Some Basic Principles and Techniques, NCERT Solutions for Class 9 Science Maths Hindi English Math, NCERT Solutions for Class 10 Maths Science English Hindi SST, Class 11 Maths Ncert Solutions Biology Chemistry English Physics, Class 12 Maths Ncert Solutions Chemistry Biology Physics pdf, Class 1 Model Test Papers Download in pdf, Class 5 Model Test Papers Download in pdf, Class 6 Model Test Papers Download in pdf, Class 7 Model Test Papers Download in pdf, Class 8 Model Test Papers Download in pdf, Class 9 Model Test Papers Download in pdf, Class 10 Model Test Papers Download in pdf, Class 11 Model Test Papers Download in pdf, Class 12 Model Test Papers Download in pdf. Class-XI Physics Handwritten Notes Ch 1: Physical World Ch 2: Units and Measurements Ch 3: Motion in a Straight Line Ch 4: Motion in a Plane (a)Vectors (b) Projectile Ch 5: Laws of Motion Ch 6: Work,Energy and Power Ch 7: System of Particles & Rotational Motion Ch 8: Gravitation Ch 9: Mechanical Properties of… Read more For example, let us carry out the addition of three numbers 3.52, 2.3 and 6.24, having different precisions or different number of decimal places. • Matter can also be classified into elements, compounds and mixtures. Constituents of mixtures can be separated by physical methods. Extramarks provides ICSE Class 11 Chemistry syllabus, sample questions papers, online study material, ICSE class 6 notes, e learning videos, ICSE class 6 worksheets for each topic to score high in exams. 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. Let us consider the combustion of methane. They are polluting environment at an alarming rate. 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. • Organic  Chemistry  -This  branch  deals  with  study  of  carbon  compounds especially hydrocarbons and their derivatives. The reactant which is not consumed completely in the reaction is called excess reactant. Pure substances: A pure substance may be defined as a single substance (or matter) which cannot be separated by simple physical methods. Molar mass of the solute X volume of the solution in liter. consist of two or more parts (phases), which have different compositions. Matter can exist in three physical states: (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. 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. SOME BASIC CONCEPTS OF CHEMISTRY. Its symbol is ‘mol’. These mixtures  have visible boundaries of separation between the different constituents and can be seen with the naked eye e.g., sand and salt, chalk powder in water etc. Note—Temperature below 0 °C (i.e. The mass of a substance is constant whereas its weight may vary from one place to another due to change in gravity. During the above decomposition reaction, matter is neither gained nor lost. • Avogadro number: The number of atoms, molecules or any other particles present in a given system are expressed in terms of Avogadro constant. This unit is quite large and a chemist often expresses density in g cm3 where mass is expressed in gram and volume is expressed in cm3. With this study material, the chapter Some Basic Concepts of Chemistry can be simplified a great deal.These Notes of Chemistry Class 11 Chapter 1 further allow you to grasp any minute … It has the units of (length)3. CH is the empirical formula of benzene. (A) In Agriculture and Food: The method used to accomplish this is called factor label method or unit factor method or dimensional analysis. It is obtained by multiplying the atomic mass of each element by number of its atoms and adding them together. This law was proposed by Louis Proust in 1799, which states that: Solids 2. 1. 1V     1V               2V Mass: Mass of a substance is the amount of matter present in it. 3. Some elements such as sodium . Stoichiometry, thus deals with the calculation of masses (sometimes volume also) of the reactants and the products involved in a chemical reaction. The following experiments illustrate the truth of this law. 4. •Atoms  combine  with  each  other  in  simple  whole  number  ratios  to  form compound atoms called molecules. 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. for longer periods. 1. In other words, matter can neither be created nor destroyed. • Addition and Subtraction of Significant Figures Commonorganic compounds are oils, wax, fats etc. 5. Physics Chemistry रास्ते बदलो पर मंज़िल नहीं 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 Chemistry… Read more Compounds For example, Carbon dioxide may be formed in a number of ways i.e., 1. • Mass and Weight M1V1 = M2V2, where M1= initial molarity, M2= molarity of the new solution, V1= Zeros at the end of a number without decimal point are ambiguous. • A zero becomes significant in case it comes in between non zero numbers. abbreviated as SI) was established by the 11th General Conference on Weights and Measures (CGPM fromConferenceGenerale des Poids at Measures). For example, 2.003 has four significantfigures, 4.02 has three significant figures. 5, In a mixture, the constituents do not lose their identities i.e., a mixture shows the characteristics of all the constituents . Liquids: In liquids, the particles are close to each other but can move around. • Dimensional Analysis 2. 1 L = 1000 mL, 1000 cm3 = 1 dm3. • Industrial Chemistry-The chemistry involved in industrial processes is studied under this branch. And 1 amu = 1.66056×10–24 g. Liquids 3. In SI units, volume is expressed in metre3 (m3). (i) Law of Conservation of Mass It is equal to the mass of the international prototype (ii) Law of Definite Proportions The word ‘stoichiometry’ is derived from two Greek words—Stoicheion (meaning element) and metron (meaning measure). The chapters that are included in the answer booklet are: Some basic concepts of chemistry; Structure of atom; Classification of elements and periodicity 3. structure and properties of matter. (ii) Law of Definite Proportions Download Handwritten Notes on all the topics of Class XI Chemistry. 1. Atoms of different elements differ in mass. Scientific Notation • Compounds always contain a definite proportion of the same elements by mass. (v) Avogadro’s Law: Avogadro proposed that, equal volumes of gases at the same temperature and pressure should contain equal number of molecules. Thus, hydrogen, nitrogen and oxygen gases consist of molecules in which two atoms combine to give the respective molecules of the element. Avogadro’s Number, NA = 6.022 × 1023 •  In  exponential  notations,  the  numerical  portion  represents  the  number  of significant figures. ... Handwritten Notes, NEET 2020, NEET 2021, NEET Aspirants, Physical Chemistry, Organic Chemistry, Inorganic Chemistry, Kota notes, Topper Notes, NEET MOST WANTED notes, Allen Notes, ... MTG OBJECTIVES NCERT AT YOUR FINGERTIPS BIOLOGY PHYSICS CHEMISTRY FOR NEET. 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. detergents, metal alloys and other inorganic and organic chemicals including new materials contribute in a big way to the national economy. • Atomic Mass have been prepared artificially. Ionic compounds such as NaCl, KNO3, Na2C03 etc. figures. Molarity of the solution = No. 2. •  Zeros at the beginning of a number are not significant. A 5 % solution of sodium chloride means that 5 g of NaCl is present in 100g of the solution. By different devices like burette, pipette, cylinder, measuring flask etc off... Wallah is India Favourite Youtube Channel Owned by Alakh Pandey Sir Provide the Education for 11... How many times the molecule of carbon dioxide is 44 times heavier than 1/12th the... And pneumonia are curable due to change in gravity path travelled by light in vacuum a. 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