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FCAT Grade 8 Science Assessment Practice Questions

Category - FCAT Science Assessment Grade 8

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Which of the following is true at the triple point in the phase diagram of a compound?
  1. It is the point at which the gas phase of the compound has triple its normal volume.
  2. It is the point at which the compound is a solid, liquid, and a gas.
  3. It is the point at which the compound turns into plasma.
  4. It is the point at which the compound is able to sublimate from solid to gas.
  5. None of the above are true.
Explanation
Answer: B - At the triple point, the compound can exist as a solid, liquid, and a gas at the same time. The point at which the compound turns into plasma is called the critical point, and there isn’t really a name for the point at which sublimation occurs, because it occur at a variety of pressures and temperatures.
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