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A pure substance has a melting point which is always .......
- a)Higher than its freezing point
- b)Higher than its boiling point
- c)Different
- d)The same
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A pure substance has a melting point which is always .......a)Higher t...
Understanding Melting and Freezing Points
When discussing the properties of a pure substance, it's essential to understand the concepts of melting and freezing points. These two terms describe the same physical process but from different perspectives.
Definition of Melting Point
- The melting point of a substance is the temperature at which it transitions from a solid to a liquid state.
- At this temperature, the solid's particles gain enough energy to overcome the forces holding them together.
Definition of Freezing Point
- The freezing point is the temperature at which a liquid turns into a solid.
- It occurs when the particles lose energy and come close enough to form stable bonds.
Key Relationship
- For pure substances, the melting point and freezing point occur at the same temperature.
- This means that when a pure substance melts at a certain temperature, it will freeze at that exact temperature when cooled.
Implications of the Same Temperature
- This relationship is significant because it confirms that the phase transition is reversible.
- The energy changes during melting and freezing are equal in magnitude but opposite in direction.
Conclusion
Thus, the correct answer is option 'D': the melting point is the same as the freezing point for a pure substance. Understanding this concept is fundamental in the study of materials and their properties in science.
When discussing the properties of a pure substance, it's essential to understand the concepts of melting and freezing points. These two terms describe the same physical process but from different perspectives.
Definition of Melting Point
- The melting point of a substance is the temperature at which it transitions from a solid to a liquid state.
- At this temperature, the solid's particles gain enough energy to overcome the forces holding them together.
Definition of Freezing Point
- The freezing point is the temperature at which a liquid turns into a solid.
- It occurs when the particles lose energy and come close enough to form stable bonds.
Key Relationship
- For pure substances, the melting point and freezing point occur at the same temperature.
- This means that when a pure substance melts at a certain temperature, it will freeze at that exact temperature when cooled.
Implications of the Same Temperature
- This relationship is significant because it confirms that the phase transition is reversible.
- The energy changes during melting and freezing are equal in magnitude but opposite in direction.
Conclusion
Thus, the correct answer is option 'D': the melting point is the same as the freezing point for a pure substance. Understanding this concept is fundamental in the study of materials and their properties in science.
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Community Answer
A pure substance has a melting point which is always .......a)Higher t...
For a pure substance, the melting point is always the same across all samples of that substance, as it is a characteristic physical property.
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A pure substance has a melting point which is always .......a)Higher than its freezing pointb)Higher than its boiling pointc)Differentd)The sameCorrect answer is option 'D'. Can you explain this answer? for Class 8 2026 is part of Class 8 preparation. The Question and answers have been prepared according to the Class 8 exam syllabus. Information about A pure substance has a melting point which is always .......a)Higher than its freezing pointb)Higher than its boiling pointc)Differentd)The sameCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 8 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A pure substance has a melting point which is always .......a)Higher than its freezing pointb)Higher than its boiling pointc)Differentd)The sameCorrect answer is option 'D'. Can you explain this answer?.
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