Anything containing two separate entities is a mixture. Sand and water is a heterogeneous mixture because it is not the same throughout.
Because you mixed sand and water together in the beaker.
No. It would be a mixture containing not just the compound water, but dissolved salts and other minerals.
A useless mixture is obtained.
No. Oil and water would form a heterogeneous mixture. A solution is a homogeneous mixture.
Water is a compound. Seawater is a mixture containing salts as well as water.
Pour the sand, salt, water mixture through a filter into beaker 1. The sand will be left behind. Pour this into beaker 2. Evaporate the liquid, condensing the vapor into beaker 3. This will be pure water, leaving the salt in beaker 2.
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A mixture containing water and insoluble impurities suspended.
a homogeneos solution
Concrete is a mixture containing cement, sand, gravel and water.
Salt is the solute, and water is the solvent.
Hard water is a mixture: water containing calcium and magnesium carbonates, also some sulfates or chlorides.