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Introduction of Thermochemistry and System (in Hindi)
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Introduction of the system and surrounding

Vishwa Vivek Sharma
verified & star educator|| IIT-JEE NEET|| 5+ year experience|| hindi & English medium ||Chemistry || youtube- "Sharmaji education"

U
Unacademy user
impressive lectures sir!
Sumit Kapoor
2 years ago
Thanks do review the course too
  1. 58.3k 4.9 views 2 unacadem Vishwa Vivek Sharma Educator since April 2017 chemical engineer |I IIT-JEE NEET Mentorll 5+ year experiencell chemistry guru || youtube- "Sharmaji education 9.9k 8 Followers Following Courses 56 Edit Profile


  2. Live classes IT JEE NEET Chemistry


  3. CHEMISTRY EE MAIN/NEET THERMOCHEMISTRY E = Efinal-Einitial Activated complex Surroundings Energy out of system to surroundings:-sign 400 Products 300 200 100 otential Energy Energy into system from surroundings: + sign System Reactants Reaction Pathway Follow me for Advance Chemistry Er. Vishwa Vivek Sharma


  4. CHEMISTRY JEE MAIN/NEET In this chapter, we will study the heat changes that take place when a chemical process occurs. Heat (a form of energy) is either evolved or absorbed in the course of chemical reaction. The study of energetic considers the relationship between thermodynamical functions heat (q), work (W) and internal energy (U or E). Follow me for Advance Chemistry Er. Vishwa Vivek Sharma


  5. CHEMISTRY EE MAIN/NEET Definitions System: A nfine our study ofenergy changes is called as a system. Surroundings: The remainder ofthe universe (i.e., apart from the system), which can interact with the system is called as surroundings small portion of the universe with-n which we co Follow me for Advance Chemistry Er. Vishwa Vivek Sharma


  6. CHEMISTRY EE MAIN/NEET Surroundings Open System This type ofsystem can exchange matter as well as energy with surroundings. The boundary is not sealed and not insulated. Sodium reacting with water in an open bea ker is an example of open system. Matter System (Heat+ Work) Energy Follow me for Advance Chemistry Er. Vishwa Vivek Sharma


  7. CHEMISTRY EE MAIN/NEET Closed System: This type of system can exchange energy in the form of heat, work or radiations but not matter with its sur roundings. The boundary between system and srround ings is sealed but not insulated. For example, liquid incon tact with vapour in a sealed forms a closed system. Heat can be transferred through the walls of the tube to the su roundings but total amount of matter remains the same as vapours cannot escape. Surroundings Matter energy as Systemheat Follow me for Advance Chemistry Er. Vishwa Vivek Sharma


  8. CHEMISTRY EE MAIN/NEET Isolated System Surroundings This type of system has no interaction with its sur roundings. Neither matter nor energy can be exchanged with suroundings. A substance contained in an idealther mos-flask is an example of an isolated system. Matter 9-0 Energy Follow me for Advance Chemistry Er. Vishwa Vivek Sharma


  9. CHEMISTRY EE MAIN/NEET Thermodynamics Properties: (i) Intensive Properties The properties which do not depend upon the quantity ofmatter present in the system are called Intensive properties. Pressure, temperature, specific heat, surface tension, refractive index, viscos- ity, melting point, boiling point, volume per mole (molar volume), concentration, colour potential electrical field electrical resistivity, specific energy, etc. are examples of intensive properties of the system. Follow me for Advance Chemistry Er. Vishwa Vivek Sharma


  10. CHEMISTRY EE MAIN/NEET (ii) Extensive Properties: The properties whose magnitude depends upon the quantity of matter present in the system are called Extensive Properties. Internal energy, total moles, volume, enthalpy, entropy, Gibbs en- ergy, length, mass, electrical resistance etc. are examples of extensive properties. Follow me for Advance Chemistry Er. Vishwa Vivek Sharma


  11. CHEMISTRY JEE MAIN/NEET First law of Thermodynamics Energy can neither be created nor destroyed, although it can be transformed from one form to another. Ifwe supply an amount ofheat)to the system in state l, the system does a work w and goes to achieve the state 2. The heat supplied to the system gets converted into two parts: (a) Work done by the system (b) Change in intermal energy ofthe system. From law ofconservation ofEnergy, we have: This equation is known as First Law of Thermodynamics. Follow me for Advance Chemistry Er. Vishwa Vivek Sharma


  12. CHEMISTRY JEE MAIN/NEET Enthalpy: It is a thermodynamic function (H) defined to study heat changes in chemicalreactions. It is also known as heat content ofthe stem defined as: H-U+PV where P: Pressure V: Volume Ifthe change ofstate takes place at constant pressure, q is denoted as qp (heat transfer at constant pres- sure). It is also known as change in enthalpy of the system, represented as AH (H Enthalpyof the system) In such a process, volume ofthe system will change and work done is given as: 11'--PAV ": change m volume AU+PAV [Using first law ofthermodynamics] Follow me for Advance Chemistry Er. Vishwa Vivek Sharma