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What is the critical point of a substance?

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Question: What is the critical point of a substance?

Options:

  1. The temperature at which a substance can exist as a solid
  2. The temperature and pressure at which gas and liquid phases are indistinguishable
  3. The point at which a substance boils
  4. The temperature at which a substance freezes

Correct Answer: The temperature and pressure at which gas and liquid phases are indistinguishable

Solution: 

The critical point is the temperature and pressure at which the gas and liquid phases of a substance become indistinguishable.

What is the critical point of a substance?

Practice Questions

Q1
What is the critical point of a substance?
  1. The temperature at which a substance can exist as a solid
  2. The temperature and pressure at which gas and liquid phases are indistinguishable
  3. The point at which a substance boils
  4. The temperature at which a substance freezes

Questions & Step-by-Step Solutions

What is the critical point of a substance?
  • Step 1: Understand that substances can exist in different states, like solid, liquid, and gas.
  • Step 2: Know that the critical point is a special condition for a substance.
  • Step 3: Learn that at the critical point, the temperature and pressure are very high.
  • Step 4: Realize that at this point, the gas and liquid forms of the substance cannot be told apart.
  • Step 5: Remember that beyond the critical point, the substance is in a supercritical state, which has properties of both gas and liquid.
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