A consumer observes the following sequence while making a hot beverage: • Ice cubes…
CHEMISTRY · Multi-part · CBSE · Chemistry · Is Matter Around Us Pure? · Is Matter Around Us Pure?
Problem
A consumer observes the following sequence while making a hot beverage:
• Ice cubes placed in a beaker of water gradually disappear as the mixture is heated.
• Sugar crystals are stirred into the warm liquid until the solution appears clear.
• The solution is allowed to cool; white crystals re-form on the inside walls of the beaker.
Answer the following questions about the three observable events.
(a) For each event, state whether the change is physical or chemical.
(b) Describe the macroscopic evidence that supports your classification for each event.
(c) Explain, at the particulate level, what happens to the substance(s) involved in each event, and justify how this explanation confirms your classification.