Questions: 11) Which scientist found that "Chemical reactions occur when atoms are separated, joined, or rearranged:" A. Dalton C. Thomson B. Rutherford D. Democritus

11) Which scientist found that "Chemical reactions occur when atoms are separated, joined, or rearranged:" A. Dalton C. Thomson B. Rutherford D. Democritus
Transcript text: 11) Which scientist found that "Chemical reactions occur when atoms are separated, joined, or rearranged:" A. Dalton C. Thomson B. Rutherford D. Democritus
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Solution

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Solution Steps

Step 1: Understand the Question

The question asks which scientist discovered that chemical reactions involve the separation, joining, or rearrangement of atoms. This is a fundamental concept in chemistry related to atomic theory.

Step 2: Recall Historical Contributions
  • John Dalton is known for formulating the atomic theory, which includes the idea that chemical reactions involve the rearrangement of atoms.
  • J.J. Thomson is known for discovering the electron and proposing the plum pudding model of the atom.
  • Ernest Rutherford is known for his gold foil experiment, which led to the discovery of the atomic nucleus.
  • Democritus was an ancient Greek philosopher who theorized about the existence of indivisible particles called atoms but did not have a scientific basis for chemical reactions.
Step 3: Identify the Correct Scientist

Based on the historical contributions, John Dalton is the scientist who proposed that chemical reactions involve the rearrangement of atoms.

Final Answer

\(\boxed{\text{A. Dalton}}\)

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