Because they are not pure compounds !
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.
"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."
Fiber typically has a lower melting point compared to metals and other high-temperature materials. The melting point of fiber can vary depending on the type of material it is made from, such as glass, carbon, or polymer fibers. Generally, synthetic polymer fibers have lower melting points than natural fibers like wool or silk.
Urea has a sharp melting point because it undergoes a crystalline-to-liquid phase transition at a specific temperature. In contrast, glass does not have a sharp melting point because it is an amorphous solid with a disordered atomic structure, resulting in a gradual softening and melting process over a range of temperatures.
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.
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.
The melting and boiling points of a substance are characteristic physical properties that can be used to assess purity. A pure substance will have a sharp melting or boiling point, occurring at a specific temperature range. Impurities tend to disrupt the orderly arrangement of particles in the substance, leading to a broader or lower melting/boiling point compared to the pure form. By comparing the experimental melting or boiling point of a sample to the literature values for the pure substance, one can determine the level of purity.
No, amorphous solids do not have sharp melting points like crystalline solids. Instead, amorphous solids soften over a range of temperatures as they transition into a more fluid state, making their melting behavior less well-defined.
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.
"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."
When we heat up a crystalline solid so it starts melting.During melting the temprature does not rises until or unless the whole solid is changed into liquid.after changing into liquid it will start increasing temprature.
no but ou can eat te sharp points
In general, a sharp melting point for a crystalline organic substance can suggest a pure single compound. However, impurities or different polymorphs can also affect the sharpness of the melting point. Additional analysis, such as TLC or NMR, may be needed to confirm the purity of the compound.
Fiber typically has a lower melting point compared to metals and other high-temperature materials. The melting point of fiber can vary depending on the type of material it is made from, such as glass, carbon, or polymer fibers. Generally, synthetic polymer fibers have lower melting points than natural fibers like wool or silk.
Urea has a sharp melting point because it undergoes a crystalline-to-liquid phase transition at a specific temperature. In contrast, glass does not have a sharp melting point because it is an amorphous solid with a disordered atomic structure, resulting in a gradual softening and melting process over a range of temperatures.
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