Question

which method would you use first to separate sand from a mixture of sand, water, and salt? magnetic attraction filtration evaporation sifting

Explanation:

To separate sand from a mixture of sand, water, and salt, we analyze each method:

• Magnetic attraction: Sand, water, and salt are not magnetic, so this is ineffective.
• Filtration: Sand is insoluble in water, while salt dissolves. Filtration uses a filter (like filter paper) to trap solid sand while allowing the liquid (water with dissolved salt) to pass through. This is suitable for separating the insoluble sand from the liquid mixture first.
• Evaporation: This is used to separate dissolved solids (like salt) from water, not to separate sand initially.
• Sifting: Sifting is for separating solids of different particle sizes, but here we have a mixture with a liquid, so sifting isn’t applicable first.

So filtration is the correct first method.

Answer:

B. Filtration