Sand and gravel in a mixture have the same properties as sand and gravel when they are not mixed.Since gravel is bigger than sand, A. the mixed sand and gravel have a lower volume. B. the sand and gravel can be separated with a sieve. C. the mixed sand and gravel will stick together. D. the sand and gravel can never be separated.
Question
Sand and gravel in a mixture have the same properties as sand and gravel when they are not mixed.Since gravel is bigger than sand, A. the mixed sand and gravel have a lower volume. B. the sand and gravel can be separated with a sieve. C. the mixed sand and gravel will stick together. D. the sand and gravel can never be separated.
Solution
The correct answer is B. The sand and gravel can be separated with a sieve. This is because the gravel particles are larger than the sand particles. When the mixture is poured onto a sieve, the smaller sand particles will fall through the holes in the sieve, while the larger gravel particles will remain on top. This is a physical property of the materials and does not change when they are mixed. The other options are incorrect. The volume of the mixture would not be lower than the individual volumes of the sand and gravel (A), the sand and gravel would not stick together as they are not adhesive materials (C), and as explained, they can be separated using a sieve (D).
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