Why is it possible for a gas to take the shape of its container?
Molecules of a gas are stationary.
Molecules in a gas are shapeless.
Molecules in a gas are much farther apart than in a liquid or solid and move around more freely.
Molecules of a gas easily interact with one another.
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Which physical properties can be used to identify an unknown substance?
Choose all answers that are correct.
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For the first question, you can cross out A, and most likely C. I'd have to say it's option B, molecules in a gas are shapeless.
As for your second question, weight can change, but boiling point and density can be unique to a substance, helping you determine the identity of it. So your answer is A, boiling point, and D, density.