Find free online Chemistry Topics covering a broad range of concepts from research institutes around the world. Hess's Law of Constant Heat Summation We have already seen that the heat changes in chemical reactions are equal to the difference in internal energy (ΔU) or heat content (ΔH) of the products and reactants, depending upon whether the reaction is studied at constant … [Read more...] about Hess’s Law of Constant Heat Summation
Chemistry
Measurement of ΔU and ΔH Using Calorimetry
Find free online Chemistry Topics covering a broad range of concepts from research institutes around the world. Measurement of ΔU and ΔH Using Calorimetry Calorimeter is used for measuring the amount of heat change in a chemical or physical change. In calorimetry, the temperature change in the process is measured which is inversely proportional to the heat change. By using … [Read more...] about Measurement of ΔU and ΔH Using Calorimetry
Thermochemical Equations:
Find free online Chemistry Topics covering a broad range of concepts from research institutes around the world. Thermochemical Equations: A thermochemical equation is a balanced stoichiometric chemical equation that includes the enthalpy change (ΔH). The following conventions are adopted in thermochemical equations: 1. The coefficients in a balanced thermochemical equation … [Read more...] about Thermochemical Equations:
Enthalpy (H)
Find free online Chemistry Topics covering a broad range of concepts from research institutes around the world. Enthalpy (H) The enthalpy (H), is a thermodynamic property of a system, is defined as the sum of the internal energy (U) of a system and the product of pressure and volume of the system. That is, H = U + PV ...................... (7.8) It reflects the capacity … [Read more...] about Enthalpy (H)
First Law of Thermodynamics
Find free online Chemistry Topics covering a broad range of concepts from research institutes around the world. First Law of Thermodynamics The first law of thermodynamics, known as the law of conservation of energy, states that the total energy of an isolated system remains constant though it may change from one form to another. When a system moves from state 1 to state … [Read more...] about First Law of Thermodynamics