Question

1. Define melting point. 2. True or False. The melting point of a pure compound is a characteristic property of that compound and is independent of source and method of purification. 3. A.) Aldrich chemical company reports the melting point of a substance to be 82.0 °C. When you measure the melting point of this pure substance, you see the substance begin to melt at 79 °C and it finishes melting when the temperature reads 83 °C. What number(s) should you record in the notebook? B.) The melting point of an impure compound will always be (higher, lower, or the same) and occur over a (narrower, broader, or similar) temperature range when compared to its pure form. (CIRCLE THE PROPER ANSWERS) C.) What is the most likely explanation if the melting point of a known-to-be-pure substance is observed to be higher than its theoretical value? D.) List three observations that might be mistaken for melting. E.) Two unknown compounds (A and B) have the same melting point, but when the melting point of a mixture of A and B is determined, it occurs over a lower and broader temperature range than the individual m.p. measurements. What can you say about A and B?

          1. Define melting point.

2. True or False. The melting point of a pure compound is a characteristic property of that
compound and is independent of source and method of purification.

3.
A.) Aldrich chemical company reports the melting point of a substance to be 82.0 °C.
When you measure the melting point of this pure substance, you see the substance
begin to melt at 79 °C and it finishes melting when the temperature reads 83 °C.
What number(s) should you record in the notebook?

B.) The melting point of an impure compound will always be (higher, lower, or the same)
and occur over a (narrower, broader, or similar) temperature range when compared to
its pure form. (CIRCLE THE PROPER ANSWERS)

C.) What is the most likely explanation if the melting point of a known-to-be-pure
substance is observed to be higher than its theoretical value?

D.) List three observations that might be mistaken for melting.

E.) Two unknown compounds (A and B) have the same melting point, but when the
melting point of a mixture of A and B is determined, it occurs over a lower and
broader temperature range than the individual m.p. measurements. What can you
say about A and B?

1. Define melting point.

2. True or False. The melting point of a pure compound is a characteristic property of that
compound and is independent of source and method of purification.

3.
A.) Aldrich chemical company reports the melting point of a substance to be 82.0 °C.
When you measure the melting point of this pure substance, you see the substance
begin to melt at 79 °C and it finishes melting when the temperature reads 83 °C.
What number(s) should you record in the notebook?

B.) The melting point of an impure compound will always be (higher, lower, or the same)
and occur over a (narrower, broader, or similar) temperature range when compared to
its pure form. (CIRCLE THE PROPER ANSWERS)

C.) What is the most likely explanation if the melting point of a known-to-be-pure
substance is observed to be higher than its theoretical value?

D.) List three observations that might be mistaken for melting.

E.) Two unknown compounds (A and B) have the same melting point, but when the
melting point of a mixture of A and B is determined, it occurs over a lower and
broader temperature range than the individual m.p. measurements. What can you
say about A and B?

Added by Rebecca L.

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