some basic concepts of chemistry class 11 notes physics wallah
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. 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 detergents, metal alloys and other inorganic and organic chemicals including new materials contribute in a big way to the national economy. Metre: It is the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second. • 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. 3. The volume occupied by one mole of any substance is called its molar volume. Download Handwritten Notes on all the topics of Class XI Chemistry. This reactant which reacts completely in the reaction is called the limiting reactant or limiting reagent. • The properties of compounds are totally different from the elements from which they are formed. The mass of a substance can be determined accurately in the laboratory by using an analytical = 23.0 u + 35.5 u = 58.5 u. 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 ofâ¦ Read more Volume of the solution in litre V, The Molarity of the solution can also be expressed in terms of mass and molar mass, Molarity of the solution = Mass of the solute molarity, the following equation is used: These are given below: (A) In Agriculture and Food: (i) It has provided chemical fertilizers such as urea, calcium phosphate, sodium nitrate, ammonium phosphate [â¦] categories – physical properties and chemical properties. 3. C6H6 is the molecular formula of benzene. Where n is the common factor and also called multiplying factor. Mass percent: It is obtained by using the following relation: The mass of a substance is constant whereas its weight may vary from one place to another due to change in gravity. Accuracy is the agreement of a particular value to the true value of the result. If we consider the reaction of hydrogen and oxygen to produce water, we see that two volumes of hydrogen combine with one volume of oxygen to give two volumes of water without leaving any unreacted oxygen. Constituents of mixtures can be separated by physical methods. Chemistry has a direct impact on our life and has wide range of applications in different fields. It is denoted by m. All the organic compounds have been found to contain carbon as their essential constituent. , Air is an example of a mixture have been prepared artificially. • Classification of Matter Based upon the composition, matter can be divided into two main types: figures. There are 114 elements known to us, out of which 92 are naturally occurring while the rest So volume has units of m3 or cm3 or dm3.A common unit, litre (L) is not an SI unit, is used for measurement of volume of liquids. These are known as Celsius scale (°C), Fahrenheit scale (°F) and Kelvin scale (K). (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. CBSE Syllabus Class 12 Maths Physics Chemistry ... CBSE Syllabus Class 11 Mathematics biology chemistry ... CBSE Syllabus Class 10 Maths Science Hindi English ... CBSE Syllabus Class 9 Mathematics Science English Hindi ... Revised Syllabus for Class 12 Mathematics. For example, 0.03 has one significant figure and 0.0052 has two significant figures. It has given units of all the seven basic quantities listed above. Volume of liquids can be measured by different devices like burette, pipette, cylinder, measuring flask etc. 3. Types of mixtures: Mixtures are of two types: For example, the atomic mass of oxygen = 16 amu Therefore gram atomic mass of oxygen = 16 g. Molecular mass of a substance is defined as the average relative mass of its molecule The method used to accomplish this is called factor label method or unit factor method or dimensional analysis. The molecular formula shows the exact number of different types of atoms present in a molecule of a compound. • Percentage Composition initial volume and V2= volume of the new solution. (i) Inorganic Compounds: These are compounds which are obtained from non-living sources such as rocks and minerals. • Analytical Chemistry-This branch deals with the qualitative and quantitative analysis of various substances. For example, sodium, copper, silver, hydrogen, oxygen etc. for longer periods. Today, ‘amu’ has been replaced by ‘u’ which is known as unified mass. (D) Application in Industry: This law was proposed by Louis Proust in 1799, which states that: • Mass and Weight Mass: Mass of a substance is the amount of matter present in it. Characteristics of Gases: Gases have neither definite volume nor definite shape. Solids 2. the following ways. have the same composition throughout the sample. 1V 1V 2V • Atom is the smallest unit that takes part in chemical combinations. 1. These properties can be classified into twocategories â 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. The different constituents of a heterogeneous mixture can be seen even with naked eye. Metric System was based on the decimal system. Solids: The particles are held very close to each other in an orderly fashion and there is not much freedom of movement. Here, K is the SI unit. Today, dysentery and pneumonia are curable due to discovery of sulpha drugs and penicillin life-saving drugs. • Definitions of Basic SI Units • Molecular Formula He Provide The Education For Class 10th,Class 11th, Class 12th And For IIT Jee Students. A quantity of substance whose mass in grams is numerically equal to its molecular For example, scale and is very common these days.Temperature on this scale is shown by the sign K. ’x’. Homoatomic molecules are made up of the atoms of the same element and heteroatomic molecules are made • Significant Figures Mole fraction unit. (ii) Law of Definite Proportions 4. Organiccompounds are those, which occur in living sources such as plants and animals. 5, In a mixture, the constituents do not lose their identities i.e., a mixture shows the characteristics of all the constituents . CBSE Class 11 Basic Concepts of Chemistryâ Get here the Notes for CBSE Class 11 Basic Concepts of Chemistry. (i) Elements: An element consists of only one type of particles. i.e., 2 = 2.000000 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. The best app for CBSE students now provides Some Basic Concepts of Chemistry class 11 Notes Chemistry latest chapter wise notes for quick preparation of CBSE board exams and school based annual examinations. • Matter 2. For example, decomposition of mercuric oxide. In a compound, the constituents lose their identities i.e., i compound does not show the characteristics of the constituting elements. We can write 232.508 as 2.32508 x102 in scientific notation. Molarity of the solution = No. In all physical and chemical changes, the total mass of the reactants is equal to that of the products. 1. The ratio is = 1 : 2 : 1 The empirical formula of glucose = CH20 Volume: Volume means the space occupied by matter. The value of n may be 1, 2, 3, 4, 5, 6 etc. (i) Law of Conservation of Mass Chemistry Notes , Chemistry Assignment , Chemistry Quiz , NCERT Solution then, 5 feet and 2 inch = 62 inch, 3. The amount of products formed then depends upon the reactant which has reacted completely. Thus, hydrogen, nitrogen and oxygen gases consist of molecules in which two atoms combine to give the respective molecules of the element. SOME P- BLOCK ELEMENTS. --Every substance has unique or characteristic properties. Molality is expressed as ’m’. Such zeros indicates the position of decimal point. Temperature: There are three scales in which temperature can be measured. = 6.022 x 1023 Sometimes, in alchemical equation, the reactants present are not the amount as required according to the balanced equation. Mole fraction of the solute = Moles of the solute Mass percent or weight percent (w/w%) For example, 0.00045 isexpressed as 4.5 x 10-4 in terms of scientific notations. 2. • Element: An element contains particles of only one type which may be atoms or molecules. But it has to be reported only up to two decimal places, i.e., the answer would be 11.36. • Compounds are formed when atoms of two or more elements combine in a fixed ratio to each other. In case of even figure, the preceding digit remains unchanged. 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. Mixtures Molecular mass is the sum of atomic masses of the elements present in a molecule. (a) When matter undergoes a physical change. A balanced equation for this reaction is as given below: Topics Included are: Buy high quality CBSE video lectures as well as doubts solutions with complete technical support. For example, 16.0 has three significant figures, while 16.00has four significant figures. -> Thermometres with Celsius scale are calibrated from 0°C to 100°C. A compound is a pure substance made up of two or more elements combined in a definite proportion by mass, which could be split by suitable chemical methods. 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. 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. For example, the formula of hydrogen peroxide is H202. The mass of a substance can be determined very accurately by using an analytical balance, Volume-- Volume has the units of (length)3. These are neither created nor destroyed in a chemical reaction. balance. represent it. According to this law equal volumes of gases at the same temperature and pressure should contain equal number of molecules. abbreviated as SI) was established by the 11th General Conference on Weights and Measures (CGPM fromConferenceGenerale des Poids at Measures). Physical properties are those properties which can be measured or observed without changing the identity or the composition of the substance. 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. Law of Multiple Proportions Proposed by Dalton in 1803, this law states that:’ When two elements combine to form two or more compounds, then the differe nt masses of one element, which combine with a fixed mass of the other, bear a simple ratio to one another’. (In 1811, Given by Avogadro) Physics Notes , Physics Assignment , Physics Quiz , HC Verma Solution , NCERT Solution. • Properties of Matter and Their Measurements 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. e.g. They contain all thecertain digits plus one doubtful digit in a number. as compared to the mass of an atom of C-12 taken as 12. Pure substances: A pure substance may be defined as a single substance (or matter) which cannot be separated by simple physical methods. There are seven basic units of measurement for the quantities: length, mass, time, temperature, amount of substance, electric current and luminous intensity. (ii) Law of Definite Proportions All non-zero digits are significant. 2. In 1808, Dalton published ‘A New System of Chemical Philosophy’ in which he proposed the following: Zeros at the end of a number without decimal point are ambiguous. Get Some Basic Concepts of Chemistry, Chemistry Chapter Notes, Questions & Answers, Video Lessons, Practice Test and more for CBSE Class 10 at TopperLearning. Mixtures may be either homogeneous or heterogeneous in nature. It In a mixture, or more elements or compounds are simply mixed and not combined chemically. Significant Figures In simple terms, atomic mass of an element expressed in grams is the gram atomic mass or gram atom. These are given below: (i) Skill and accuracy of the worker (ii) Limitations of measuring instruments. The smallest particle of an element, which may or may not have independent Some elements such as sodium . The decimal place does not Chemical reactions involve reorganisation of atoms. 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 (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. (i) Law of Conservation of Mass • Physical Chemistry-The explanation of fundamental principles governing various chemical phenomena is the main concern of this branch. For example, common salt, marble and limestone. 1.5. Class 11 - Chemistry Video Lectures by DronStudy.com. There are two ways of classifying the matter: (b) Combination between nitrogen and hydrogen: The two gases lead to the formation of ammonia gas under suitable conditions. It is usually represented by NA: 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. of moles of the solute = n e.g.H2(g) + Cl2(g) ---→2HCl(g) 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. During the above decomposition reaction, matter is neither gained nor lost. per mol or millilitre per mol, The mass percentage of each constituent element present in any compound is called Physics Wallah Is India Favourite Youtube Channel Owned By Alakh Pandey Sir. In a compound, the elements are present in the fixed ratio by mass. We have discussed the physical and chemical properties: it helps to express the measured in. Fraction: it is the agreement of a particular amount of matter equal. 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Of preparation needed by the symbol m. Measurements in molarity can change with the qualitative and analysis.
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