| Physical Change | Chemical Change |
|---|---|
| 1. No new substance is formed. | 1. New substance is formed. |
| 2. It is a reversible change. | 2. It is irreversible change. |
| 3. The properties of constituents are retained. | 3. The properties of constituents are not retained. |
| 4. No new substance is formed. | 4. Completely new substance is formed. |
What is atomic mass unit?
Updated 1/12/2026
After a heavy rain, a group of students collected a sample of water from a nearby puddle. They observed that the water was cloudy and had some fine particles suspended in it. When they left the sample undisturbed for an hour, they noticed that some of the particles settled at the bottom of the container. When they tried to pass a beam of light through the sample, the path of light was visible. i. What type of mixture is the puddle water sample (solution, suspension, or colloid)? Give reasons for your answer based on the observations. ii. What would happen to the visibility of the light beam if the students filtered the sample and then passed the light through the filtrate? iii. Is the puddle water a pure substance or a mixture? Explain. iv. How could the students separate the suspended particles from the water?
Updated 1/12/2026
State the properties of a suspension.
Updated 1/12/2026
Give the applications of centrifugation.
Updated 1/12/2026
Riya prepares a salt solution by dissolving 20 grams of common salt in 180 grams of water. She wants to express the concentration of this solution. i. What is the mass of the solute in this solution? ii. What is the mass of the solvent in this solution? iii. What is the total mass of the solution? iv. Calculate the concentration of the solution in terms of mass by mass percentage. (Formula: (Mass of solute / Mass of solution) × 100)
Updated 1/12/2026
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