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Digesting and assimilating food , synthesizing polymers that are used to make clothing , containers , cookware , and credit cards , and refining crude oil into gasoline and other products are just a few examples . As you proceed through this course , you will discover many different examples of changes in the composition and structure of matter , how to classify these changes and how they occurred , their causes , the changes in energy that accompany them , and the principles and laws involved . As you learn about these things , you will be learning chemistry , the study of the composition , properties , and interactions of matter . The practice of chemistry is not limited to chemistry books or laboratories : It happens whenever someone is involved in changes in matter or in conditions that may lead to such changes . Chemistry is a science based on observation and experimentation .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.