thermochemical
1. The system is everything studied energy changes. 2. The environment is everything that is around the system. 3. The change in enthalpy is the energy change in a reaction yangberlangsung at a constant pressure. 4. Various kinds of changes in the H formation enthalpy, Hpenguraian, H burning, and H neutralization. 5. Any chemical changes involving heat is always accompanied by the release or absorption of energy. Exothermic reaction is a reaction that liberates heat (H = -). Endothermic reaction is a reaction that absorbs heat (H =). 6. The amount of heat absorbed or released can be calculated by the formula; q = mxcx (t 7. H reaction can be determined: a. Experimentally b. Based c. Based on Hess's Law. D. Based bond energy 8. Reaction enthalpy change depends only on the state initial and final state of the reaction and does not depend on the stage of the reaction. 9. bond energy is the amount of energy needed to break the tie antaratom in 1 mole of gaseous molecules. 10. heat of combustion is the heat released when 1 mole of fuel burned completely in oxygen excess. 11. impact incomplete combustion will result in air pollution that would endanger health. Keyword • System • Environment • enthalpy • exothermic reaction enthalpy change • • • Changes endothermic reaction standard enthalpy of formation ((HRF) • standard enthalpy change of decomposition ((Hrd) • neutralization enthalpy change ((hRN) • Heat burning • greenhouse effect • Energy ties • combustion enthalpy change ((Hrc).
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