Which of the following statements is true regarding the melting and boiling points of pure substance

JAMB Chemistry 2023 63 views

Which of the following statements is true regarding the melting and boiling points of pure substances?

  1. The melting point is always higher than the boiling point.
  2. The boiling point directly affect the melting point.
  3. The melting and boiling points are always the same for all substances.
  4. The melting and boiling points can vary depending on the substance. ✓

Explanation

Different substances have different melting and boiling points based on their molecular structure and bonding. Ice melts at 0°C while iron melts at 1538°C.

The strength of forces between particles determines these temperatures. Stronger intermolecular forces require more heat to overcome, resulting in higher melting and boiling points.

Each pure substance has unique characteristic temperatures at which it changes state. These values help identify unknown substances and predict their behavior at different temperatures.

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