11. After isolation of a pure substance , the task of elucidating its chemical structure can be addressed. 12. Most often, the solvent is a liquid, which can be a pure substance or a mixture. 13. Then a process is possible in which that pure substance is transferred between system and surroundings. 14. By suitable thermodynamic operations, the pure substance reservoir can be dealt with as a closed system. 15. Pure substances that are liquid under normal conditions include water, ethanol and many other organic solvents.16. By cleaning the possible side effects could be limit to the effects of the pure substance . 17. "It is a very pure substance known as Peruvian flakes, " police spokesman Ales Svoboda said Monday. 18. :: I suspect one could almost certainly find pure substances that a normal car would happily run on. 19. Some APIs may be tableted as pure substances , but this is rarely the case; most formulations include excipients. 20. Metallic bonding is not the only type of chemical bonding a metal can exhibit, even as a pure substance .
