Poor writing is hard to read.
Good writing communicates an idea with correct grammar, carefully chosen words, and wen connected sentences. Good writing in chemistry must describe to a reader, who will not necessarily have done an experiment like that which you are writing about, all the facts necessary for the reader to understand what was done and what data they could expect to duplicate should they reproduce the experiment in their own laboratory. Good writing in chemistry must also interpret the experimental results and present these interpretations in an understandable manner to the reader. All interpretations must be argued for by references to already known principles in chemistry. Therefore, good writing in chemistry is succinctly descriptive, logically interpretive, and coherently argumentative.