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    				| 1. | How do you observe the diffusion of coffee powder in water? Write your findings. | 
| Answer» 1. Take half bowl water. 2. Prepare a small ball of coffee powder. 3. Slowly put in water and observe. Observations: 1. The ball of coffee powder starts dissolving in water. 2. The water around the coffee powder will appear dark in colour. 3. As time progresses, all the water in the beaker becomes coloured. 4. Initially pale in colour and slowly all the water in the beaker becomes uniformly coloured. Coffee powder molecules diffuse into the water forming uniform colour. | |