NCERT Class 9 Science Chapter 5 Exploring Mixtures and Their Separation Solutions
NCERT Class 9 Science Chapter 5 Exploring Mixtures and Their Separation Solutions Think It Over (Page No. 72) 1. Why do suspended particles settle in muddy water over time but not in milk? Answer: Muddy water is a suspension, where particles are large and heavy. Due to gravity, these particles settle down at the bottom when left undisturbed. Milk, on the other hand, is a colloid. Its particles are very small and remain evenly dispersed, so they do not settle even after a long time. 2. How is evaporation different from boiling? Answer: Evaporation: Happens at any temperature Occurs only at the surface of the liquid It is a slow process Boiling: Happens at a fixed temperature (boiling point) Occurs throughout the liquid It is a fast process 3. Why do you see bright rays of sunlight when it passes through small gaps between the leaves of a dense tree? Answer: This happens due to the Tyndall Effect. When sunlight passes through small gaps, it gets scattered by dust and tiny particles in ...