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Questions and Answers
What is the condition for a solid to be considered pure based on its melting range?
What is the condition for a solid to be considered pure based on its melting range?
- The melting range is sharp (correct)
- The solid does not melt at all
- The melting point is extremely high
- The melting range is broad
What happens to the melting point of a substance as molecular weight increases?
What happens to the melting point of a substance as molecular weight increases?
- The melting point remains constant
- The melting point decreases
- The melting point fluctuates randomly
- The melting point increases (correct)
Why does a higher molecular weight molecule have a higher melting point?
Why does a higher molecular weight molecule have a higher melting point?
- Because it requires less energy to break the bond
- Because it requires more energy to break the bond (correct)
- Because it has higher acidity
- Because it is less reactive
What indicates that a solid substance is impure?
What indicates that a solid substance is impure?
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What condition describes the melting point of a substance?
What condition describes the melting point of a substance?
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Study Notes
Determination of Melting Points
- A solid undergoes a phase transition to a liquid at a specific temperature, where the solid and liquid states coexist in equilibrium.
Factors Affecting Melting Points
- Purity of the Chemical:
- A sharp melting range indicates a pure solid.
- A large melting range indicates an impure solid, which does not represent the true melting point.
Molecular Weight and Melting Points
- The greater the molecular weight of a molecule, the stronger the bond between molecules.
- Stronger bonds require high energy to break, resulting in higher melting points.
- Examples:
- CRR - CH3: 15°C
- CH3-CH3: 30°C
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Description
Learn about the temperature at which a solid turns into a liquid and the factors that affect melting points, including the purity of the chemical.
