Question

think critically *81. apply concepts devise a way to separate sand from a mixture of charcoal, sand, sugar, and water.

Explanation:

Step1: Filter out charcoal

Use a filter paper to separate the charcoal (solid) from the liquid - solid mixture. The charcoal will be trapped on the filter paper, and the filtrate will contain sand, sugar, and water.

Step2: Evaporate the filtrate

Heat the filtrate (containing sand, sugar, and water) gently. The water will evaporate, and we will be left with a mixture of sand and sugar.

Step3: Dissolve in water (again)

Add water to the mixture of sand and sugar and stir. The sugar will dissolve in water, but the sand will not.

Step4: Filter to get sand

Use a filter paper to filter the mixture. The sand will be trapped on the filter paper, and the filtrate will be a sugar - water solution.

Answer:

1. First, use filtration to remove charcoal from the mixture (charcoal, sand, sugar, water). The charcoal is trapped on the filter paper, and the filtrate contains sand, sugar, and water.
2. Then, evaporate the filtrate to remove water, leaving a mixture of sand and sugar.
3. Next, add water to the sand - sugar mixture and stir to dissolve the sugar.
4. Finally, filter the mixture. The sand will be on the filter paper, thus separating sand from the original mixture.