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Heat and Enthalpy - Thermochemistry Video Lecture | Physical Chemistry

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FAQs on Heat and Enthalpy - Thermochemistry Video Lecture - Physical Chemistry

1. What is the difference between heat and enthalpy?
Ans. Heat refers to the transfer of energy between two objects or systems due to a temperature difference, while enthalpy is a measure of the total energy of a system, including both its internal energy and the energy associated with its surroundings.
2. How is heat related to enthalpy change?
Ans. Heat is directly related to enthalpy change. Enthalpy change, denoted as ΔH, is the heat exchanged between a system and its surroundings during a process occurring at constant pressure. It can be positive (endothermic) if heat is absorbed by the system or negative (exothermic) if heat is released by the system.
3. Can enthalpy be measured directly?
Ans. Enthalpy cannot be measured directly since it is a state function, meaning it depends only on the initial and final states of a system. However, changes in enthalpy (ΔH) can be measured experimentally using techniques like calorimetry.
4. How is enthalpy calculated?
Ans. Enthalpy change (ΔH) can be calculated using the equation ΔH = q + PΔV, where q is the heat exchanged between the system and surroundings, P is the constant pressure, and ΔV is the change in volume. If the reaction occurs at constant pressure, ΔH can be determined from the heat released or absorbed.
5. What is the significance of enthalpy in thermochemistry?
Ans. Enthalpy is a crucial concept in thermochemistry as it quantifies the heat flow in a chemical reaction or physical process. It helps determine whether a reaction is exothermic (releases heat) or endothermic (absorbs heat) and allows for the calculation of heat changes and reaction enthalpies.
83 videos|142 docs|67 tests
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