Chemistry is, briefly, the study of the transformation or various changes of matter. Chemistry deals primarily with the structure of the material, tangible world, and also with the intangible, the small, microcosmic world as well. Chemistry is a very difficult subject for those that have never taken it or do not have a general knowledge of it due to the proliferation of arcane terminology and mathematical formulas. If you are having trouble with your chemistry class then do some extra research. It will be both advantageous and rewarding. There are many boxed book sets on the subject but you should try to find one that both fits your level of understanding and level of reading comprehension.