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Iodine is often seen as an example of a substance
that changes directly from a solid to a gas. However,
data books that give the standard physical
measurements for substances show values for the
melting point (114 °C) and boiling point (184 °C) of
iodine at atmospheric pressure.
a
Explain why iodine seems to miss out the
liquid stage if crystals are heated strongly in a
boiling tube.
b Suggest how you could demonstrate that iodine
can melt to form a liquid at atmospheric pressure.

Sagot :

The correct answer is :

a) The van der Waals forces are easily overcome and the molecule easily transitions into the gas phase when iodine crystals are heated. They dissolve into a dense cloud of purple colour.

London dispersion forces are another name for van der Waals forces.

Actually, the non-polar molecule is subject to these weak electrostatic forces. Or, to put it another way, since these are the only forces that interact with non-polar molecules, we can say that they are accountable for the neutral atom's existence.

The transitory or temporary dipoles produced in the non-polar elements are attracted to one another by these Van der Waals forces.

b) Iron nail (Ferrum) reacts with copper sulphate (CuSO 4) when it is dipped in it, changing the substance's colour from blue to pale green. This demonstrates that iron is more reactive than copper since it may take the place of copper in CuSO4.

To learn more about Van der Waals forces refer the link:

https://brainly.com/question/13201335

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