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Answered 2013-02-15 20:02:59

Because they are not pure compounds !

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in crystalline solids, the atoms are arranged in an ordered fashion and hence they have sharp melting points. amorphous solids, due to random arrangement of the atoms do not have sharp melting points.


Y,es the melting point of pure substances is always sharp. When unadulterated by impurities, the boiling point will always remain the same, or sharp.


Many fibers have sharp melting points due to their impurities. Many are impure mixes, so they may melt at various temperatures.


your hard cheeses such as bleu cheese, sharp cheddar, feta and so on have higher melting points


"As the atoms of Crystalline solids have specific shape and same distance,so they have same K.E,intermolecular forces of attraction and geometrical shape due to which Crystalline solids are blessed sharp melting points."


the melting point of pure substances is always being sharp. it means that the boiling point it have it will boil at that point not some up or down but on same temperature in other words we say that it has no impurities because of impurities it boiling point varies and it has many other components and boiling point of every component is different so that why the boiling point of impure compounds varies or it don t have exact value and the pure compounds have same elements combine together and every molecule boil at particular point so it has sharp melting point or exact point


Generally they are two types of solids 1. Crystalline solids 2. Amorphous solids. Amorphous solids are those solids which having different properties in different directions. They didnt have sharp melting and boiling points.


There is an increase in the melting point of elements from left to right but this increase is not very sharp and continuous because there are a number of exception.


The crystalline solids have a sharp melting point say 87oC but most of the amorphous solids do not have a sharp melting point they have a range of melting say they started melting at 87oC and continue till 89oC.



Urea is a pure crystalline compound so has a sharp melting point while glass is an amorphous mixture.


since most of the refractories are mixtures of metal oxides they donot have sharp melting points.so the refractoriness of arefractory is generally measured as the softening temperature and is expressed in terms of pyrometric cone equivalent (PCE)


evaporation occurs at every temperature but boiling occurs at a sharp temperature known as boiling point.


Applying heat to grass will not cause it to melt but to burn. Glass is a silica compound that due to the addition of soda softens at about 1500 °C (2700 °F) It is not a true "melting point" since amorphous solids do not have sharp melting points like crystalline solids do.


Thermosetting plastics do not have a sharp melting point they become decomposed on heating.


Rubber is a natural polymer and polymers usually don't have a sharp melting point on heating rubber becomes decomposed.


Sharp, dull, and broken.


They are two types of solid and i guess both are having different properties ...See,! their properties are different crystalline solids are having sharp melting and boiling point......and amorphous are having low melting and boiling point2. they are having a proper geometrical structure and as far as amorphous solids are concerned , they aren't having proper geometrical structures....and there are lot more ...... and i guess they both are not having any similarity........


Having rough, sharp points protruding.


Only PURE compounds have sharp, unique melting and freezing points of the same value.The substance of most waxes is not pure, but their melting point (or -trajectum) is about the same as its freezing 'point'/trajectum.Example:Beeswax is mainly composed of the ester myricyl palmitate.Its melting 'point' is 62-65 °C (= trajectum, range), and it's also freezing when cooling from 65 to 62 °C


Vinegar, like most liquids, can be boiled. Some recipes call for adding vinegar to boiling water. Boiling vinegar has a sharp smell.


Chocolate does not have a sharp melting point, it softens and melts over a range of temperature, this is true for amorphous solids, for example glasses.


I think is a prism. it is because it has no sharp points.


An impure sample will have a lower melting point, and will also have wider melting point range than that of a pure sample of the same substance. a sharp melting point range can also indicate a eutectic mixture


Glasses of all kinds do not have sharp melting points, they typically soften well below the melting point. The melting point is determined by the composition.There are many types of glass in use even round the home where borosilicate glases and soda glass are the most likely. Pure silica melts at arounf 16500C other silicate glasses melt lower than this. Borosilicate glases around 14000C



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