When obtaining the melting point of a compound, describe the results that will be obtained if...

When obtaining the melting point of a compound, describe the results that will be obtained if a sample is heated at a rate of 5 degrees C/minute near the actual melting point of the sample

Expert Solution

Your melting range will be too broad, but this time on the high end! If a sample should melt at 130-131 ºC, but you are heating fast, it will still probably begin to melt at about 130 ºC, but the full sample won’t have time to absorb heat and finish melting by 131 ºC. Instead, the heating device may have warmed well above 131º before the interior liquefies, so the observed range may appear to be 130-136 ºC. Both the magnitude of the range and the high end of the range may be misleading. For doing routine samples, it is appropriate to be warming at 5 ˚C per minute around the temperature at which melting occurs. This broadens the range somewhat, but not badly. And it keeps the melting point experiment from taking forever.

queen_honey_blossom answered 2 years ago

The melting point of a solid compound is reported as a range of two temperatures. For...

The melting point of a solid compound is reported as a range of two temperatures. For example, the literature (known) melting point of benzamide is 125-128 °C. a.What does the first temperature in this range indicate? b.What does the last temperature in this range indicate?

1. Explain why impurities broaden the melting point of a compound. 2. In the recrystallization process,...

1. Explain why impurities broaden the melting point of a compound. 2. In the recrystallization process, when removing insoluble impurities why is it important to keep the filtration apparatus on the hot plate? 3. In the recrystallization process, why is it important to cool the solution slowly after heating?

5. What is the difference between the capillary melting point and true melting point?

What effect does polarity have on the melting point of a pure compound? Use electronegativity values...

What effect does polarity have on the melting point of a pure compound? Use electronegativity values to classify the bonds in each of the following compounds as ionic, polar covalent, or nonpolar covalent. (a) MgCl2 (select)nonpolar covalentionicpolar covalent (b) CO2 (select)ionicpolar covalentnonpolar covalent (c) H2S (select)polar covalentnonpolar covalentionic (d) NO2 (select)nonpolar covalentpolar covalentionic

When 27.2 g of solid A, at its melting point of 34.0 °C, was added to...

When 27.2 g of solid A, at its melting point of 34.0 °C, was added to 62.7 g of liquid A at 51.2 °C, the mixture cooled to 35.0 °C, with no solid remaining. Given the specific heat of liquid A (s = 0.798 J/g·°C), find the heat of fusion per gram of solid A. Assume that no heat enters or leaves the mixture. That is, assume that the mixture is an isolated system and therefore that q1 + q2...

1. When measuring the melting point of an unknown, why is it necessary to prepare two...

1. When measuring the melting point of an unknown, why is it necessary to prepare two samples for determination? (Hint: Included in the answer should be the RATE at which the temperature should be allowed to rise when determining an accurate melting point).

Understand the stability as it pertains to melting point

Define the term melting point range

When 27.2 g of solid A, at its melting point of 34.0 degree C, was added...

When 27.2 g of solid A, at its melting point of 34.0 degree C, was added to 62.7 g of liquid A at 51.2 degree C, the mixture cooled to 35.0 degree C, with no solid remaining. Given the specific heat of liquid A (s = 0.798 J/g degree C), find the heat of fusion per gram of solid A. Assume that no heat enters or leaves the mixture. That is, assume that the mixture is an isolated system and...

Melting point of ferrocene = 171.5-172.6 degrees Celcius Literature melting point of ferrocene = 172-174 degrees...

Melting point of ferrocene = 171.5-172.6 degrees Celcius Literature melting point of ferrocene = 172-174 degrees Celcius Melting point of acetylferrocene = 78.9-83.2 degrees Celcius Literature melting point = 81-81 degrees Celcius What do these melting points indicate about the purity and identity of the ferrocene and acetylferrocene samples?

Question