Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Increase in molecular size. Stronger the forces of intermolecular attraction (cohesive forces) greater is the surface tension. A gas consists of large number of tiny particles called molecules. NCERT Books. is directly proportional to absolute temperature. Boiling point varies linearly with external pressure. When the values of pressure, volume and temperature are expressed as fractions of the corresponding critical values we have. There is a continuous rapid random motion of gas molecules. :  The distance between the centers of the molecules at the point of their closest approach. Therefore Z = 1. Fraction of molecules having very small or very high velocities is very low. NCERT Class 11 Chemistry Revision Notes Download in PDF. It is symbol  γ (gamma); We measure it with the help of an apparatus,  stalagmometer. Or, The volume occupied by the gas molecules is negligible as compared to the total volume of the gas. The units of viscosity are poise (P) where 1P = g cm, . GRAPHICAL REPRESENTATION OF AVOGADRO’S LAW. where , and are termed, the reduced  pressure, the reduced volume and the reduced temperature respectively. This short notes on Mole concept and Stoichiometry will help you in revising the topic before the NEET Exam. It is sealed at both the […] Most probable velocity increases with the rise in temperature but fraction of molecules possessing such velocity decreases. These notes are entirely made by the allaboutnotes team. U = root mean square velocity = √3RT / M, Root mean square velocity (U): • cannot flow. If two gases are taken at different pressures, then, as greater the pressure, greater is the, Comparison of times taken for effusion/diffusion of the same volume of two different. Materials which we see in our daily lives such as ice-cream, chair, water etc. The greater the value of ‘a’, the greater the strength of van der Waals forces. As the work can be expressed in different systems of units, R will have different values. CO. show negative deviation at low pressure and positive deviation at high pressure. CBSE guide notes are the comprehensive notes which covers the latest syllabus of CBSE and NCERT. The physical state of the matter changes by changing temperature. The temperature at which the vapour pressure of liquid becomes equal to atmospheric pressure (or the external pressure) is termed as the boiling point of liquid. These notes offer students with the detailed explanation of important concepts, summary of the chapters, important points to remember, and derivations of formulae for better comprehension and retaining of the chapters. Thus matter is classified mainly into three categories depending upon its physical state namely solid, liquid and gaseous states. are made up of the matter. Out of these solid, liquid and gas are commonly found while remaining two are found only under specific conditions. Click here . The magnitude of vapour pressure depends upon the following two factors. Temperature: Vapour pressure increases with increasing temperature. A gas can be liquefied by. : It increases attraction among molecules. Click here. Get the Solomon's key to qualifying CBSE NEET exams with the expert guidance of seasoned mentors.        (a) nb                                                       (b) an2 /v2, (c)-an2/v2                                                 (d) – nb, 4. S.I. This interaction is stronger than the London forces but is weaker than ion-ion interaction because only partial charges are involved. Out of these solid, liquid and gas are commonly found while remaining two … From the above postulates, the kinetic gas equation derived is This category only includes cookies that ensures basic functionalities and security features of the website. but definite volume due to weaker intermolecular force of attraction than solids. The greater the value of ‘a’, the greater the strength of van der W. aals’ forces and greater is the ease with which a gas can be liquefied. The vapour pressures of a given liquid at two different temperatures may be compared using Clausius Clapeyron equation, are the vapour pressures at temperature T. ΔH is the heat of vapourisation and R is molar gas constant. The coefficients A,B,C,D, etc are known as first, second, third, fourth virial  coefficients. It states that equal volumes of all gases under the same conditions of temperature and pressure contain an equal number of molecules. They have mass and volume, and hence they can be regarded as matter. The effect of temperature is, however more important. The phenomenon of conversion of a gas into liquid is known as liquefaction. These notes will also help you in your IIT JEE & NEET preparations. V1/T1 = V2/T2  (T1 = 27 + 273 = 300 K)  These things occupy some space and have mass and volume. Full Course; ... is mixed with 11.2 L of Cl 2 (g), each at STP, the moles of HCl(g) formed is equal to. Important notes of Chemistry for NEET, JEE for Hydrocarbons are useful for all aspirants preparing for entrance exams including JEE, NEET. The liquids having weak intermolecular attraction have greater tendency of escaping from the liquid surface in comparison to liquids having stronger forces of intermolecular attraction. Hence at low pressure the gases show negative deviation. the plasma is neutral. 3. For gaseous state, a force of attraction << thermal energy. They may be the food we eat, the vehicles, the gadgets, the day-to-day materials that we use, the air we breathe or the water that we drink. The molecules collide with each other and with the walls of a container. h is the difference in the mercury levels in the two columns of density (d) (of a gas) Different gases have different value for ‘a’. We hope these Physics Notes for Class 11 will help you understand the important topics and remember the key points for the exam point of view. No molecule has zero velocity. NEET help on Whatsapp Chat . (i) increasing pressure. It is mandatory to procure user consent prior to running these cookies on your website. Revision Notes on States of Matter. There 2-3 questions are asked from Anatomy of Flowering Plants chapter every year in the exam of NEET, AIIMS, and JIPMER. Volume occupied by the gas molecules is negligible as compared to the total volume of gas. Become our.   = 1.987 or 2 cal K-1 mol-1. Important notes are also helpful for revision when you have less time and have to study many topics. Right from an adrenaline rush to brewing a base in a test tube… it is there in our own biological system and also in the external environment. :  It is expressed in grams or kg. Sarthaks eConnect uses cookies to improve your experience, help personalize content, and provide a safer experience.