Elements, Compounds, and Mixtures — Unit test Answers

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Which is a characteristic of mixtures?

They are chemically bonded together.

They can be classified as pure substances.

They have fixed ratios between their components.

They can be separated by physical processes.

Which of Dalton's ideas about the atom did J.J. Thomson's experiment disprove?

It disproved that atoms are divisible.

It disproved that atoms are indivisible.

It disproved that atoms contain protons.

It disproved that atoms contain electrons.

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