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Standard 4.0 Chemistry

Topic C. States of Matter

Indicator 1. Provide evidence from investigations to identify the processes that can be used to change materials from one state of matter to another.

Objective a. Observe and describe the changes heating and cooling cause to the different states in which water exists.

Selected Response Item

Seawater contains a number of different salts. The water can be separated by a process called distillation. A simple distillation setup is shown below.

Question Image

The water in the flask evaporates. Water vapor (gas) rises, leaving the salt in the flask. The water vapor is cooled in the condensing tube and drips into the beaker.

During the process shown in the diagram, water vapor (gas) changes into liquid water by

  1. cooling
  2. evaporating
  3. freezing
  4. warming
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Correct Answer:
A