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a process that takes energy into the system. This increases the internal energy of the system (increases the enthalpy of the system).
materials put into the soil to provide the required nutrients essential to plant life and growth...
a process that releases energy from the system. This decreases the internal energy of the system...
a new species or substance that exists after a chemical reaction has occurred. This excludes un-...
a solid network of atoms making up a large crystal with covalent bonds between the atoms.