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13 December, 23:41

You are building a shelf at home. As you sand the wood dust floats into the air. The air and dust from sanding create which of the following.

a. a solution

b. a pure substance

c. a colloid

d. a suspension

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Answers (2)
  1. 14 December, 00:08
    0
    Solution, colloids and suspension are different kind of mixtures.

    Air and dust are not solutions, because the dust can be observed (using light).

    There is a doubt about whether air and dust form a colloid or a suspension.

    Colloids do not separate, while suspension's components do separate. If the dust is small enough it will remain on the air long enough to be considered a colloid for all efects.

    Then, the most acceptable opinion is that the mixture of air and dust is a colloid.

    So, option c. a colloid.
  2. 14 December, 03:28
    0
    A colloid and a suspension are the same thing so it rules out c and d because the dust is heavier than air causing it to float down but not float constantly. a pure substance is one solid substance. so its be A. a solution. a solution is a homogenous mixture of 2 or more substances because it wouldn't only compose of wood dust because of the air oxygen and carbon dioxide keeping it from falling faster.
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