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3. A sample taken on a Gallenkamp melting point apparatus was found t0 melt at 127.2-130.3 *C. The compound contains either Compound B, which melts at 135.3-136.1 *...

Question

3. A sample taken on a Gallenkamp melting point apparatus was found t0 melt at 127.2-130.3 *C. The compound contains either Compound B, which melts at 135.3-136.1 *C. Or Compound which melts at 121.2-122.3 *C as pure compounds Which compound does the sample contain? Explain your reasoning based on what you know about melting points.

3. A sample taken on a Gallenkamp melting point apparatus was found t0 melt at 127.2-130.3 *C. The compound contains either Compound B, which melts at 135.3-136.1 *C. Or Compound which melts at 121.2-122.3 *C as pure compounds Which compound does the sample contain? Explain your reasoning based on what you know about melting points.



Answers

Explain the difference in the melting points of the following compounds:

A higher melting point is the result of stronger in America forces. Government interactions are stronger poses and solid than non government. More inter molecular interactions. Silicon carbide is a carbon solid held together by an extended or by a network rob medium is an alkali metal and Erica limiters have relatively low melting point 15 and I owe Dean are non polar molecules, hence their only experiences London forces. So the compounds saw the highest median point is silicon carbide done. Louis melting point is due to the weakest inter american forces. A comparisons will be made between Irene and butane for that was my point molecular mass of I. A deal is 2 54 grandpa more. And that for right detainees. Yeah, is 54 gram five more due to the large site Irene experiences greater London forces than that. Off beauty from this discussion, it can be concluded that Newton has the lowest melting point hence of sensi. So you can start by and someday. Butane. Right panic option. The reason for incorrect option of C. And we are option C. Rubidium is an al Qaeda murder, and or carry matters have predictable law. Meeting what option B I owe, Dean, mm. Do you do large sites Irene expenses get around on forces than their talk? Beauty and right. Also see and be our intellect.

Okay, so we have a laundry list of melting points for various elements for this question. Um, I'm gonna try my best to assign them to each element, and then we can take a look at what trends we have. So for aluminum, uh, that is 6 60 for beryllium. It's I'm sorry for our gun. It is minus 1 89 Really? Um, Well, 78 or on 20. 300. Carbon 33. 50. Corinne minus 11 with him. Florian. Sorry. Minus 2 20 Lithium 1 79 Magnesium. That is 6 51 Me on minus 2 49 Oxygen. I'm sorry. Nitrogen minus 2 10 Oxygen minus 2 18 Phosphorous 5 90 Silicon 14. 10 sodium 98 and sulfur 1 19 Okay, so taking a look at the trends here. So we start out, um, fairly close to zero compared to some other elements over on the left hand side of the periodic table. And then it looks like we jump up precipitously. Uh, and this trend upward trend continues until about carbon. And then suddenly, um, it starts to it falls precipitously at nitrogen. Um, where it continues to drop further towards inert gases such as noble gases of me on and are gone. Um, this trend is a little more subdued for the next period, down from the second period. Um, however, we are still seeing the same trend of a significant climb between the second and fourth elements of the period and then a steep drop after that, from the fifth to hey, Element. Uh, so we can clearly see that the melting point in each group begins with a positive figure. There's a steep rise followed by a steep fall and then ending with a negative value as we approach a sui approach. The inert element in this period, uh thus we can conclude that melting point is a periodic property.

Answered apart. A with due to the presence of impurities lowers the melting points as the lattice points are occupied by the impurities. For most compounds, the pure compounds has a higher melting points than the impure sample Part B. Are there any instances where the melting point could be higher? Um, there is a case where let's suppose compound A is present as an impurity in a simple compound B. The melting points compound B is much higher, then compound A in this case, the melting point of the sample, maybe higher than that of Compound A, depending upon the composition.

Okay. The melting points me differ slightly yeah. From sample to sample. Okay. Mhm. And colour may also vary slightly. Mhm. Mhm. Since these depend yeah on the amount of impurities in each sample. Mhm. Mhm. According to the law of constant proportion. Yeah. Mhm. Yeah. Mhm. Yeah. Okay. Mhm. Yeah. A compound has the same composition of elements. Yeah. Yeah. Yeah. Before yeah. So we can expect the elemental composition. Mhm. Yeah. Mhm. Yeah. Mhm. Okay. For each sample to be the same. Mhm. Yeah. Mhm.


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