A sealed glass flask contains a small pile of solid iodine at the bottom
CHEMISTRY · Multi-part · CBSE · Chemistry · Matter in Our Surroundings · Matter in Our Surroundings
Problem
A sealed glass flask contains a small pile of solid iodine at the bottom. A particulate-level sketch of the contents before heating shows regularly arranged purple spheres in contact with one another at the bottom of the container and no particles elsewhere in the flask. A second sketch made after the flask has been gently warmed shows the same number of purple spheres dispersed uniformly throughout the entire volume of the flask with none in contact with each other.
Answer the following about the process that occurred inside the flask.
(1) Describe the differences between the two particulate sketches in terms of particle arrangement and spacing.
(2) Classify the change that occurred as physical or chemical. Justify your classification by referring specifically to the presence or absence of chemical bond formation or cleavage.
(3) Predict whether the mass of the sealed flask changes during this process and explain your reasoning.
(4) Identify the type of intermolecular forces that must be overcome for this change to occur and describe how their strength compares with the strength of the intramolecular forces in iodine molecules.