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Executing processes and controlling processes. Planning processes and executing processes. Planning processes and controlling processes. Controlling processes and closing processes.
The scientific revolution in the seventeenth century. Reasons that chemistry developed slowly as a science. The practical aspects of chemistry. Difficulties of organizing knowledge systematically.
Philosophers devised theories about chemical properties. A special symbolic language was developed. Experience led workers to revise their techniques. Experts shared their discoveries with the public.
recognized determined solved hindered
Chemical knowledge was limited to a small number of people. The symbolic language used was very imprecise. Very few new discoveries were made by alchemists. The records of the chemical processes were not based on experiments.
Problem. Material. Difficulty. System.
nor can it be destroyed not it be destroyed so can’t it not be destroyed either it cannot be destoryed
In addition to As a result of In spite of With regard to
the chemical should the chemical shouldn’t should the chemical should the chemical not
involve；damaging involved；damaged involving；damage involved；damage
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