Unit Test — Unit test

Question 1

Which statement about the physical change of liquid water boiling into steam is true?

Revolt · Accepted Answer

The heat added represents an energy change.

Question 2

What is the equation for density?

Revolt · Accepted Answer

D =

Question 3

Henry mixed salt and water together in a cup until he observed a clear solution. He measured the mass of the solution. Then he placed the cup outside for several sunny days during the summer. After a week, he observed that only solid salt remained in the cup and the mass had decreased. Henry concluded that a physical and chemical change occurred in this investigation.

Revolt · Accepted Answer

He is incorrect. Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.

Question 4

Brian made this table to organize his notes on changes of state.Which change of state has the wrong energy change listed?

Revolt · Accepted Answer

deposition

Question 5

Which statement best describes the energy changes associated with evaporation and boiling?

Revolt · Accepted Answer

Atoms gain energy during evaporation and boiling.

Unit Test — Unit test Answers

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