the effect of impurities on the melting point?why?

Answer 1

The melting point is the same as the freezing point, usually. The freezing/melting point is usually lowered to a lower temperature by impurities due to the impurities "messing up" the crystal lattice of the solid phase. The crystal lattice cannot form as easily with a lot of garbage present, so it requires a lower temperature to accomplish freezing. Likewise, the polluted crystal lattice will melt easier and thus it will melt at a lower temperature. This is why we put anti-freeze into our car radiators, to keep your engine block from cracking from the freezing of the coolant water during freezing weather. I hope this helps

Answer 2

If X and A are not the same substance (even though they separately have the same melting point), then a mixture of the two will usually show a lower melting point and a broader melting point range than either substance alone. This is because each substance acts as an impurity in the other. Miscible or partially miscible impurities, even when present in small amounts, usually lower the melting point and broaden its range.

Please read "Theory of Melting Point Depression "

Answer 3

The impurties have a higher melting point then the melting point of the substance of intretes will go up because the impurity will have the ability to absorb more heat.

If the impurity is lower than the melting point of the intrests will go down because the impurity will start to melt and look like the whole thing is melting

Answer 4

Impurities causes a decrease in melting points of any substance. It also brings about a broad melting point range for the substance usually about 3 - 10oC. For example, a pure sample of a compound might melt at 138-140oC whereas an impure sample might show a depressed melting point range of 116-122oC.

I'll have to propose an idea: because of the presence of impurities in a substance/compound, the concentration of the compound decreases, thus reducing its melting point

Goodluck with your research

Answer 5

An impurity the two lowers the melting element and will enhance the melting element variety. this permits you to the two inspect the purity of a compound, as properly as make a very good id of an unknown compound. enable's say for occasion which you have only synthesized cinnamic acid interior the lab, for which the organic compound has a melting factor to 133 stages. if your compound has a melting factor to 128-a hundred thirty stages, it maximum probable isn't overly organic. besides, you may mixture a small quantity of organic cinnamic acid with your synthesized compound. If this has no effect on the melting element variety, your synthesized compound is in certainty cinnamic acid. If including organic cinnamic acid reduces the melting element to 124-127 stages, the compound isn't cinnamic acid.