Dalton's experiments advanced our understanding of the atom without


A. carefully observing and measuring events.

B. discovering the internal structure of the atom.

C. examining the ratios of elements involved in chemical reactions.

D. testing a hypothesis.

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It would be B

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To determine the correct answer, let's examine each option and see if it aligns with Dalton's experiments and their impact on our understanding of the atom.

A. Carefully observing and measuring events: This option is not entirely accurate because while Dalton did conduct experiments, his contributions were not solely based on observation and measurement. Therefore, we can eliminate Option A.

B. Discovering the internal structure of the atom: Dalton's experiments did not provide direct evidence for the internal structure of the atom. While he proposed the atomic theory, which explained the behavior and properties of elements, he did not have knowledge about the specific internal structure of atoms. Therefore, we can eliminate Option B.

C. Examining the ratios of elements involved in chemical reactions: This option aligns well with Dalton's experiments and contributions. Dalton analyzed the ratios of elements involved in chemical reactions and formulated the concept of atomic masses and proportions in chemical compounds based on these ratios. This formed a vital aspect of his atomic theory. Therefore, Option C appears to be the correct choice.

D. Testing a hypothesis: While Dalton did construct hypotheses and conduct experiments, the specific act of testing hypotheses is not explicitly mentioned as a key aspect of his experiments. Therefore, we can eliminate Option D.

Based on the analysis, the most appropriate answer would be:

C. Examining the ratios of elements involved in chemical reactions.