The Progress of Scientific Knowledge

Question 1

Which of these discoveries contradict components of Dalton’s atomic theory? Check all of the boxes that apply.

Revolt · Accepted Answer

Atoms contain smaller particles: protons, neutrons, and electrons.; Atoms of a given element can have different numbers of neutrons.; Nuclear reactions can change an atom of one element into an atom of another element.

Question 2

Which of these statements is supported by the results of Thomson’s experiment? Check all of the boxes that apply.

Revolt · Accepted Answer

Cathode rays are made up of negatively charged particles.; Atoms contain negatively charged particles.

Question 3

The pictures to the right, show two different models of the atom. Type in the letter of your answer.Which model best represents Dalton’s atomic theory?

Revolt · Accepted Answer

B

Question 4

Which model best represents the modifications to the theory that Thomson’s results made necessary?

Revolt · Accepted Answer

A

Question 5

Question 5

Revolt · Accepted Answer

Atoms contain negatively charged particles.; The electron has a specific mass.

The Progress of Scientific Knowledge Answers

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