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Answers
Answer:
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Explanation:
((((1))))Polymorphism is the ability of a solid substance to crystallised into more than one different crystal structure. Different polymorphs have different arrangements of atoms within the unit cell, and this can have a profound effect on the properties of the final crystallised compound. The change that takes place between crystal structures of the same chemical compound is called polymorphic transformation.
The set of unique crystal structures a given compound may form are called polymorphs.... Calcium carbonate is dimorphous (two forms), crystallizing as calcite or aragonite. Titanium dioxide is trimorphous;.. its three formsare brookite, anatase, and rutile. The prevailing crystal structure depends on both the temperature and the external pressure...
Iron is a metal with polymorphism structure. Each structure stable in the range of temperature, for example, when iron crystallizes at 1 538 °C it is bcc , at 1 394 °C the structure changes to fcc (y-iron or austenite), and at 912 °C it again becomes bcc (a-iron or ferrite).
(((2)))A halogenation reaction is a chemical reaction between a substance and a halogen in which one or more halogen atoms are incorporated into molecules of the substance. ..... and this is extra knowledge.........
Halogenation of an alkane produces a hydrocarbon derivative in which one or more halogen atoms have been substituted for hydrogen atoms.