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Doing chemistry involves attempting to answer questions and explain observations in terms of the laws and theories of chemistry , using procedures that are accepted by the scientific community . There is no single route to answering a question or explaining an observation , but there is an aspect common to every approach : Each uses knowledge based on experiments that can be reproduced to verify the results . Some routes involve a hypothesis , a tentative explanation of observations that acts as a guide for gathering and checking information . We test a hypothesis by experimentation , calculation , and/or comparison with the experiments of others and then refine it as needed . Some hypotheses are attempts to explain the behavior that is summarized in laws .
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.