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- https://chem.libretexts.org/Courses/Lubbock_Christian_University/LCU%3A_CHE_1305_-_Introductory_Chemistry/11%3A_Energy/11.6%3A_Phase_ChangesFusion, vaporization, and sublimation are endothermic processes, whereas freezing, condensation, and deposition are exothermic processes. Changes of state are examples of phase changes, or phase trans...Fusion, vaporization, and sublimation are endothermic processes, whereas freezing, condensation, and deposition are exothermic processes. Changes of state are examples of phase changes, or phase transitions. All phase changes are accompanied by changes in the energy of a system. Changes from a more-ordered state to a less-ordered state (such as a liquid to a gas) are endothermic. Changes from a less-ordered state to a more-ordered state (such as a liquid to a solid) are always exothermic.
- https://chem.libretexts.org/Courses/Los_Angeles_Trade_Technical_College/Chem_51/19%3A_Nuclear_Chemistry/19.07%3A_FissionNuclear fission is a process in which a very heavy nucleus splits into smaller nuclei of intermediate mass. Because the smaller nuclei are more stable, the fission process releases tremendous amounts ...Nuclear fission is a process in which a very heavy nucleus splits into smaller nuclei of intermediate mass. Because the smaller nuclei are more stable, the fission process releases tremendous amounts of energy. Nuclear fusion is a process in which light-mass nuclei combine to form a heavier and more stable nucleus. Fusion produces even more energy than fission. In the sun and other stars, four hydrogen nuclei combine at extremely high temperatures & pressures to produce a helium nucleus.
- https://chem.libretexts.org/Courses/University_of_Missouri/MU%3A__1330H_(Keller)/11%3A_Liquids_and_Intermolecular_Forces/11.4%3A_Phase_ChangesFusion, vaporization, and sublimation are endothermic processes, whereas freezing, condensation, and deposition are exothermic processes. Changes of state are examples of phase changes, or phase trans...Fusion, vaporization, and sublimation are endothermic processes, whereas freezing, condensation, and deposition are exothermic processes. Changes of state are examples of phase changes, or phase transitions. All phase changes are accompanied by changes in the energy of a system. Changes from a more-ordered state to a less-ordered state (such as a liquid to a gas) are endothermic. Changes from a less-ordered state to a more-ordered state (such as a liquid to a solid) are always exothermic.
- https://chem.libretexts.org/Courses/Prince_Georges_Community_College/CHEM_2000%3A_Chemistry_for_Engineers_(Sinex)/Unit_7%3A_Nuclear_Chemistry/Chapter_18%3A_Nuclear_Chemistry/Chapter_18.4%3A_Thermodynamic_Stability_of_the_Atomic_NucleusThe minimum mass capable of supporting sustained fission is called the critical massThe minimum mass of a fissile isotope capable of supporting sustained fission.. This amount depends on the purity of...The minimum mass capable of supporting sustained fission is called the critical massThe minimum mass of a fissile isotope capable of supporting sustained fission.. This amount depends on the purity of the material and the shape of the mass, which corresponds to the amount of surface area available from which neutrons can escape, and on the identity of the isotope.
- https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Nuclear_Chemistry/Fission_and_Fusion/Fission_and_FusionThe energy harnessed in nuclei is released in nuclear reactions. Fission is the splitting of a heavy nucleus into lighter nuclei and fusion is the combining of nuclei to form a bigger and heavier nucl...The energy harnessed in nuclei is released in nuclear reactions. Fission is the splitting of a heavy nucleus into lighter nuclei and fusion is the combining of nuclei to form a bigger and heavier nucleus. The consequence of fission or fusion is the absorption or release of energy.
- https://chem.libretexts.org/Courses/Nassau_Community_College/Principles_of_Chemistry/15%3A_Nuclear_Chemistry/15.06%3A_Nuclear_EnergyNuclear energy comes from tiny mass changes in nuclei as radioactive processes occur. In fission, large nuclei break apart and release energy; in fusion, small nuclei merge together and release energy...Nuclear energy comes from tiny mass changes in nuclei as radioactive processes occur. In fission, large nuclei break apart and release energy; in fusion, small nuclei merge together and release energy.
- https://chem.libretexts.org/Bookshelves/General_Chemistry/Chemistry_1e_(OpenSTAX)/21%3A_Nuclear_Chemistry/21.04%3A_Transmutation_and_Nuclear_EnergyIt is possible to produce new atoms by bombarding other atoms with nuclei or high-speed particles. The products of these transmutation reactions can be stable or radioactive. A number of artificial el...It is possible to produce new atoms by bombarding other atoms with nuclei or high-speed particles. The products of these transmutation reactions can be stable or radioactive. A number of artificial elements, including technetium, astatine, and the transuranium elements, have been produced in this way. Nuclear power as well as nuclear weapon detonations can be generated through fission (reactions in which a heavy nucleus is split into two or more lighter nuclei and several neutrons).
- https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Physical_Chemistry_(LibreTexts)/21%3A_Entropy_and_the_Third_Law_of_Thermodynamics/21.03%3A_The_Entropy_of_a_Phase_Transition_can_be_Calculated_from_the_Enthalpy_of_the_Phase_TransitionThis page discusses phase transitions, including melting, which occur under constant temperature and pressure, leading to enthalpy and entropy changes. It highlights first-order transitions, character...This page discusses phase transitions, including melting, which occur under constant temperature and pressure, leading to enthalpy and entropy changes. It highlights first-order transitions, characterized by discontinuities in first-order derivatives, and notes that all phase transitions involve changes in entropy. Additionally, it mentions that second-order derivatives, such as heat capacity, exhibit singularities at transition points.
- https://chem.libretexts.org/Courses/Los_Angeles_Trade_Technical_College/Chem_51/19%3A_Nuclear_Chemistry/19.02%3A__The_History_and_Basics_of_FissionNuclei that are larger than iron-56 may undergo nuclear reactions in which they break up into two or more smaller nuclei. This releases large amounts of energy in the form of heat, light, and gamma ra...Nuclei that are larger than iron-56 may undergo nuclear reactions in which they break up into two or more smaller nuclei. This releases large amounts of energy in the form of heat, light, and gamma radiation.
- https://chem.libretexts.org/Courses/University_of_Kentucky/UK%3A_General_Chemistry/21%3A_Nuclear_Chemistry/21.4%3A_Transmutation_and_Nuclear_EnergyIt is possible to produce new atoms by bombarding other atoms with nuclei or high-speed particles. The products of these transmutation reactions can be stable or radioactive. A number of artificial el...It is possible to produce new atoms by bombarding other atoms with nuclei or high-speed particles. The products of these transmutation reactions can be stable or radioactive. A number of artificial elements, including technetium, astatine, and the transuranium elements, have been produced in this way. Nuclear power as well as nuclear weapon detonations can be generated through fission (reactions in which a heavy nucleus is split into two or more lighter nuclei and several neutrons).
- https://chem.libretexts.org/Bookshelves/General_Chemistry/Chemistry_2e_(OpenStax)/21%3A_Nuclear_Chemistry/21.04%3A_Transmutation_and_Nuclear_EnergyIt is possible to produce new atoms by bombarding other atoms with nuclei or high-speed particles. The products of these transmutation reactions can be stable or radioactive. A number of artificial el...It is possible to produce new atoms by bombarding other atoms with nuclei or high-speed particles. The products of these transmutation reactions can be stable or radioactive. A number of artificial elements, including technetium, astatine, and the transuranium elements, have been produced in this way. Nuclear power as well as nuclear weapon detonations can be generated through fission (reactions in which a heavy nucleus is split into two or more lighter nuclei and several neutrons).
