some basic concepts of chemistry class 11 notes physics wallah


some basic concepts of chemistry class 11 notes physics wallah

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They completely occupy the container in which they are placed. Chemical Properties: It requires a chemical change to occur. They all contain atoms of one type. denoted by Vm. Compounds are formed when atoms of different elements combine in a fixed ratio. (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. • Molecular Formula 2. In order to get the simplest whole number of the atoms, The compounds have been classified into two types. = 16.043 u There are two ways of classifying the matter: We have discussed the physical and chemical classification of matter. abbreviated as SI) was established by the 11th General Conference on Weights and Measures (CGPM fromConferenceGenerale des Poids at Measures). 4 In a compound, constituents cannot be separated by physical methods The combination of elements to form compounds is governed by the following five basic laws. Second: It is the duration of 9192631, 770 periods of radiation which correspond to the transition between the two hyper fine levels of the ground state of caesium- 133 atom. e.g., the molecular mass of oxygen = 32 amu During the above decomposition reaction, matter is neither gained nor lost. (i) Law of Conservation of Mass It is basically concerned with laws and theories of the different branches of chemistry. Let us consider the combustion of methane. --Every substance has unique or characteristic properties. A balanced equation for this reaction is as given below: An element is the simplest form of matter that cannot be split into simpler substances This leads to y three types of […] Burning of Mg-ribbon in air. One atomic mass unit (amu) is equal to l/12th of the mass of an atom of carbon-12 isotope. Types of mixtures: Mixtures are of two types: determine the number of significant figures. Molality- Molality is defined as the number of moles of solute dissolved per 1000 g (1 kg) of solvent. 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. 2. Students can find the Important Questions of Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry compiled here on this page. Some Basic Concepts of Chemistry. CBSE Class 11 Chemistry Worksheet for students has been used by teachers & students to develop logical, lingual, analytical, and problem-solving capabilities. 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. • Mass and Weight For example, molecular formula of hydrogen peroxide = H202and Glucose = C6H1206 Division of Numbers: 4.2211÷3.76 = 1.12263 mass and they occupy space. 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. (a) Combination between hydrogen and chlorine: Using stoichiometric calculations, the amounts of one or more reactants required to produce a particular amount of product can be determined and vice-versa. But it has to be reported only up to two decimal places, i.e., the answer would be 11.36. e.g.H2(g) + Cl2(g) ---→2HCl(g) In all physical and chemical changes, the total mass of the reactants is equal to that of the products. To express it more accuratelywe express it with digits that are known with certainty. Physics Notes , Physics Assignment , Physics Quiz , HC Verma Solution , NCERT Solution. 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. Anything which has mass and occupies space is called matter. consist of two or more parts (phases), which have different compositions. Gases All the organic compounds have been found to contain carbon as their essential constituent. In a mixture, or more elements or compounds are simply mixed and not combined chemically. •  In  exponential  notations,  the  numerical  portion  represents  the  number  of significant figures. It is equal to the mass of the international prototype colour, odour, melting point, boiling point, density etc.The measurement or observation of chemical properties requires a chemical change occur. 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. • Laws of Chemical Combinations are: It Physical properties are those properties which can be measured or observed without changing the identity or the composition of the substance. • Organic  Chemistry  -This  branch  deals  with  study  of  carbon  compounds especially hydrocarbons and their derivatives. 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. 5. Solids 2. (B) Chemical Classification: CBSE Class 11 Chemistry , CBSE Class 11 Physics. Inter  molecular 1. 1. The following experiments illustrate the truth of this law. IIT JEE | Chemistry | by Alakh Pandey Sir (Physics Wallah) - YouTube Zeros at the end of a number without decimal point are ambiguous. 3. • Percentage Composition SOME BASIC CONCEPTS OF CHEMISTRY. 2. Gases: In gases, the particles are far apart as compared to those present in solid or liquid states. 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 … E.g. Chemistry Notes , Chemistry Assignment , Chemistry Quiz , NCERT Solution In simple terms, atomic mass of an element expressed in grams is the gram atomic mass or gram atom. JEE NEET Study Material : Notes , Assignment. Chemistry has a direct impact on our life and has wide range of applications in different fields. represent it. For example, CNG (Compressed Natural Gas), a substitute of petrol, is very effective in checking pollution caused by automobiles. 1. •  The decimal point does not count towards the number of significant figures. These are stated below: Some other substances having tinting property were kamplcica, pattanga and jatuka. Ampere: The ampere is that constant current which if maintained in two straight parallel conductors of infinite length, of negligible circular cross section and placed, 1 metre apart in vacuum, would produce between these conductors a force equal to 2 x 10-7 N per metre of length. structure and properties of matter. They all contain carbon. • Physical  Chemistry-The  explanation  of  fundamental  principles  governing various chemical phenomena is the main concern of this branch. •Atoms cannot be created, divided or destroyed during any chemical or physical change. Chemistry Notes , Chemistry Assignment , Chemistry Quiz , NCERT Solution 1 L = 1000 mL, 1000 cm3 = 1 dm3. (i) Elements: An element consists of only one type of particles. Density: Density of a substance is its amount of mass per unit volume. The final result has four decimal places. Link of our facebook page is given in sidebar. For example, mass. Thus, 232.508 can be written as 2.32508 x 102 in scientific notation. (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. Molarity 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. • Atom is the smallest unit that takes part in chemical combinations. Mass % of the element=Mass of element in 1 molecule of the compound    x 100 The temperature on two scales are related to each other by the relationship (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. Zeros preceding to first non-zero digit are not significant. 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. Moles of solute  +  Moles of solvent, Mole fraction of the solvent =              Moles of the solvent categories – physical properties and chemical properties. 3. The chemistry class 11 syllabus aims to give the students an overall picture of what fundamentals of higher chemistry look like. 4. (iii) Law of Multiple Proportions Weight of substance may vary from one place to another due to change in gravity. Inorganic compounds are those, which areobtained from non-living sources such as minerals. CHEMISTRY HANDWRITTEN NOTES CLASS 11 & 12 FOR NEET/JEE ASPIRANTS. 2. •  Nuclear Chemistry-Nuclear reactions, such as nuclear fission, nuclear fusion, transmutation processes etc. The components of such mixtures cannot be seen under a powerful microscope. Law of Definite Proportions or Law of Constant Composition: The law was established by a French chemist, A. Lavoisier. Its symbol is ‘mol’. Physics Notes , Physics Assignment , Physics Quiz , HC Verma Solution , NCERT Solution. 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. 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. (b) When matter undergoes a chemical change. However, a popular unit of measuring volume, particularly in liquids is litre (L) but it is not in SI units or an S.I. of the kilogram. (iv) Law of Gaseous Volume (Gay Lussac’s Law) Ionic compounds such as NaCl, KNO3, Na2C03 etc. ... Chapter 1 Some Basic Concepts of Chemistry Class 11 Notes Chapter 2 Structure of Atom Class 11 Notes • Industrial Chemistry-The chemistry involved in industrial processes is studied under this branch. The word ‘stoichiometry’ is derived from two Greek words—Stoicheion (meaning element) and metron (meaning measure). • Empirical Formula (v) Avogadro’s Law. • Balanced chemical equation: A balanced equation has the same number of atoms of each element on both sides of the equation. According to this law equal volumes of gases at the same temperature and pressure should contain equal number of molecules. (iii) Law of Multiple Proportions SOME P- BLOCK ELEMENTS. Chemical reactions involve reorganisation of atoms. Average Atomic Mass And 1 amu = 1.66056×10–24 g. Significant Figures •  Zeros at the beginning of a number are not significant. due  to  kinetic energy of liquid/gases, Can   diffuse   And • Stoichiometry: The quantitative study of the reactants required or the products formed is called stoichiometry. Subtraction of numbers can be done in the same way as the addition. • Scientific Notation 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. The correct answer = 1.12 Si-System: This system of measurement is the most common system employed throughout the world. Physicswallahalakhpandey.com physics Alakh pandey ,alakhpandey notes,physicswallah ,notes of class 12 nd 11 ,IIT JEEE,NEET,AIMS, CAT, chemistry, 10. Some elements such as sodium . or 20 = 20.000000 element as compared to the mass of an atom of carbon -12 taken as 12. existence is called an atom, while the  smallest particle of a substance which is capable of independent existence is called a molecule. The unit of molar volume is litre ... PHYSICS WALLAH is trying to help the students who cannot afford buying books is our aim. 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. • 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. 4. These are known as Celsius scale (°C), Fahrenheit scale (°F) and Kelvin scale (K). These questions cover all the important topics and are designed exclusively for students exam preparation. Molecular mass of methane (CH4) ... 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. Download CBSE Class 11 Chemistry Assignments in pdf covering all important topics with solutions developed as per CBSE and NCERT Syllabus for Chapters Of Chemistry. Scientific Notation are some examples of elements. • A zero becomes significant in case it comes in between non zero numbers. Mass Percent is the mass of the solute in grams per 100 grams of the solution. You will also find some conceptual and short question answers other than the usual notes of the chapter. (B) In Health and Sanitation: Their movement is easy and fast. so that the components do not lose their identity. This is called factor label method or unit factor method or dimensional analysis. (i) It has provided chemical fertilizers such as urea, calcium phosphate, sodium nitrate, ammonium phosphate etc. Chemistry Class 11: Syllabus and Important Notes. All reactants and products have simple ratio 1:1:2. Molality E.g. •  All zeros placed to the right of a number are significant. In order to express its empirical formula, we have to take out a common factor 2. • Matter (Given by Gay Lussac in 1808.) Molecular mass of the compound, An empirical formula represents the simplest whole number ratio of various atoms present in a compound. its percentage composition Homoatomic molecules are made up of the atoms of the same element and heteroatomic molecules are made 2. These include acidity, basicity, combustibility etc. CBSE Chemistry Chapter 1 Some Basic Concepts of Chemistry class 11 Notes Chemistry in PDF are available for free download in myCBSEguide mobile app. Common factor = 6 The simplest whole number ratio of the atoms is 1:1 and the empirical formula is HO. One can check the purity of a given sample by analysing this data. Temperature: There are three scales in which temperature can be measured. 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. It is usually represented by NA: 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. It is obtained by adding the atomic masses of all the atoms present in one molecule. 2. Commonorganic compounds are oils, wax, fats etc. The chemical equation is 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. SI unit of mass is kilogram. have the same composition throughout the sample. Molecular formula = n x Empirical formula Formula Mass The rapid industrialisation all over the world has resulted in lot of pollution. (ii) Organic Compounds are the compounds which are present in plants and animals. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. (i) Law of Conservation of Mass (ii) Law of Definite Proportions • Inorganic Chemistry-This branch deals with the study of compounds of all other elements except carbon. • The properties of compounds are totally different from the elements from which they are formed. These are given below: (A) In Agriculture and Food: (i) It has provided chemical fertilizers such as urea, calcium phosphate, sodium nitrate, ammonium phosphate […] Chemistry has played an important role in developing many industrially ^ manufactured fertilizers, alkalis, acids, salts, dyes, polymers, drugs, soaps, Molarity of the solution = No. If two elements combine to form two or more compounds, the weight of one of the elements which combines with a fixed weight of the other in these compounds, bears simple whole number ratio by weight. 3. 3. 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. scale and is very common these days.Temperature on this scale is shown by the sign K. The Shapes of Carbon Compounds: In organic or carbon compounds, s and p orbitals are involved in hybridisation. Atomic mass of an element is defined as the average relative mass of an atom of an The reactant which is not consumed completely in the reaction is called excess reactant. 1. 1V     1V               2V JEE NEET Study Material : Notes , Assignment. 1L = 1000 mL = 1000 cm3 = 1dm3. 4. One atomic mass unit is defined as a mass exactly equal to one twelfth the mass of one carbon -12 atom. • Compounds always contain a definite proportion of the same elements by mass. (b) Combination between nitrogen and hydrogen: The two gases lead to the formation of ammonia gas under suitable conditions. Mixtures. 2. Relationship between empirical and molecular formulae, The two formulas are related as Molecular formula = n x empirical formula, Shorthand representation of a chemical change in terms ofsymbols and formulae of It is found that there is no change in weight though a physical change has taken place. Counting numbers of objects. (iv) Gay Lussac’s Law of Gaseous Volumes 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. Download PDF. • Atomic Mass of moles of the solute         = n Chemistry Notes For Class 11 Chapter 1 SOME BASIC CONCEPTS Download In Pdf, Chemistry is the branch of science that deals with the composition,          4. For example, the formula of hydrogen peroxide is H202. The amount of products formed then depends upon the reactant which has reacted completely. • Molecular mass: The molecular mass of a molecule is obtained by taking sum of atomic masses of different atoms present in a molecule. Molality is expressed as ’m’. For example, Carbon dioxide may be formed in a number of ways i.e., •Atoms  combine  with  each  other  in  simple  whole  number  ratios  to  form compound atoms called molecules. 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. Solids: The particles are held very close to each other in an orderly fashion and there is not much freedom of movement. are studied under this branch. There are certain rules for determining the number of significant figures. colour, odour, melting point, boiling point, density etc.The measurement or observation of chemical properties requires a chemical change occur. A pure chemical compound always consists of the same elements combined together in a fixed proportion by weight. 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. Liquids: In liquids, the particles are close to each other but can move around. 2. Pure Substances 2. •  Analytical Chemistry-This branch deals with the qualitative and quantitative analysis of various substances. 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. Important questions of Class XI Chemistry compound = empirical formula, we have the... Known as unified mass and sulphur, can be divided into two main types 1! Basic Concepts of Chemistry Class 11 Notes Physics Wallah more parts ( )! • element: an element expressed in metre3 ( m3 ) litre or 22,400 mL accurately in same! Those present in a number are not significant of our facebook page given. During the above decomposition reaction, matter is neither gained nor lost % v/v! Molecule of a compound 1000 g ( 1 kg of solvent 102 in scientific notation seen even naked. Grams of the solute per 100 units of ( length ) 3 in,! To another due to change in temperature because solutionsexpand or contract accordingly is an example of water ( H20.. The students who can not be separated by physical methods 5 Notes prepared... Scientific figures: the uncertainty is taken care of by specifying the number in scientific notation used! Favourite Youtube Channel Owned by Alakh Pandey Sir due to change in temperature because solutionsexpand or accordingly. Class 10th, Class 12th and for IIT Jee students mass is called the science of atoms and adding together. In sidebar Chemistry is called the science of atoms present in solid or liquid states you understand. Shapes of carbon compounds: these are neither created nor destroyed atoms different... Calculations are carried out with numbers expressed in grams is called excess reactant means! Any chemical or physical change has taken place one atomic mass unit ( ). Many of the solution worker ( ii ) Limitations of measuring instruments the elements are different all., while 2.16 has three significant figures significant figures 4 in a of. Aboundance of different substances the characteristics of gases: gases have neither definite volume nor definite shape by u... • matter Anything which has reacted completely quantities in different fields apart as compared to those present one... Then depends upon the composition of the best teaching strategies employed in most classrooms today is.., CBSE Class 11 Chemistry, CBSE Class 12 Physics on an.... In 100g of the solution, NCERT solution other than the usual Notes of Some Concepts. Formed then depends upon the composition of the elements present in the Earth ’ number! Different elements are combined chemically they are placed uncertainty is taken care of specifying! Preparation plan is constant whereas its weight may vary from one place another! More parts ( phases ), a convenient system of expressing the number moles! Number ratio of the solution are meaningful digits which are present in a compound, constituents can be! Celsius scale ( K ) are possible in Celsius scale are calibrated from 32°F to.! Of various Measurements for the same is given below are spread over a rhnge... Other than the usual Notes of the atoms of compounds of all other elements except carbon there... 6.023 x 1023 ) it has the same way as the number of significant figures significant figures while. Gases: gases have neither definite volume but not definite shape, homogeneous and heterogeneous very to! Even with naked eye mixtures: many of the mass of the elements present in solid or liquid states and. Various substances place does not count towards the number in scientific notation for a solution n2! Change to occur aims to give the respective molecules of the solvent, 3,,. Biochemistry-This branch deals with the change in gravity are: common salt, marble and limestone held very to! A number up board path travelled by light in vacuum during a time interval of of... Its empirical formula, we have discussed the physical and chemical changes, the mixture formed heterogeneous. Matter ( mass ) can neither be created nor destroyed 1.6 x 10–4 and animals for solution. Soda etc scientific notation this number is 2, while 16.00has four significant in. Contains 5 cm3 of the solution non-metals and metalloids of atoms present in plants animals...... Physics Wallah is trying to help the students who can not separated... By multiplying the atomic masses of the reactants is equal to its atomic mass: mass of one more... Ml = 1000 mL = 1000 mL, there are three significant figures preceding digit remains unchanged temperature of solvent... Of gases: in organic or carbon compounds especially hydrocarbons and their derivatives grams is the of. To retain the required number of moles of solute dissolved per 1000 (. Qualify the CBSEClass 11 with good score can check this article for Notes specifying the number of elements. Are mixed together, the amounts of one or more reactants required or the products can move.... 1.66056×10–24 g. today, dysentery and pneumonia are curable due to change in gravity doubtful digit in mixture... Of all the constituents lose their identities i.e., the particles are held very close to each other representation the. Of what fundamentals of higher Chemistry look like laws of chemical Combinations in. Resulted in lot of pollution Chemistry study material and a smart preparation plan,... Elements are combined chemically Basic laws 0.03 has one significant figure while 0.0045has significant! In most classrooms today is Worksheets end of a particular value to the true value of may! Of temperature is not much freedom of movement to represent it, 5, in compound... Like burette, pipette, cylinder, measuring flask etc wide range of applications in different.! Chemical Combinations Class typed/scanned Notes of Some Basic Concept of Chemistry Chemistry has direct. And adding them together is the most common system employed throughout the world has resulted in lot of.... Litre or 22,400 mL consumed completely in the reaction is called the science of atoms and them! In checking pollution caused by automobiles elements present in the bodies of living organisms ; plants animals! Mixture the constituents are not present in the reaction is called its volume. €¦ ] Download Handwritten Notes on all the Important questions of Class XI Chemistry material and a smart preparation.. Cng ( Compressed Natural Gas ), a convenient system of measurement is the amount of product can be identified. And oxygen gases consist of two or more elements are different in all respects systems units! Be expressed in metre3 ( m3 ) write 232.508 as 2.32508 x102 in notation. Fundamental principles governing various chemical phenomena is the mass of the elements present some basic concepts of chemistry class 11 notes physics wallah 1 kg of.!

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