Q1: Why benzoic acid or Naphthalene needs to be crushed?
Because naphthalene and benzoic acid are crystalline in nature, they must be crushed to obtain a fine powder.
Q2: How is the melting point of the compound determined?
The melting point of the substance is determined by the average temperature readings.
Q3: How is the determination of melting point useful?
It allows us to identify unknown chemicals and determine whether or not a compound is pure.
Q4: What is a sharp melting point?
If a solid melts completely within a 1°C range, it is said to have a sharp melting point.
Q5: Why do pure solids possess a sharp melting point?
Because a pure solid has the same force of attraction between particles at different locations, it melts at the same temperature.
Q6: Can we heat the capillary tube directly for the determination of the melting point?
No, because direct heating would result in uneven and fast heating.
Q7: Why do different solids have different melting points?
The intermolecular forces that exist in the solid-state determine the melting point. Different substances have different melting points due to the strength of their intermolecular forces.
Q8: Why is the melting point of benzamide more than that of acetamide?
Benzamide and acetamide both have the same functional group, however, benzamide has a higher molecular mass than acetamide. As a result, benzamide has a higher melting point due to its stronger intermolecular interactions.
Q9: Can any other liquid be used in place of liquid paraffin to determine the melting point?
To evaluate the melting point, concentrated H2SO4 or silicone oils might be utilised.
Q10: What is the effect of impurities on the melting point of solids?
Impurities lower the melting point of a solid.
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