Martin mixed sulfur (a yellow solid) with iron filings (a black solid) in a ceramic dish called a crucible. then he separated them using a magnet. what kind of a change is this?
a.
change in state
b.
mixing and separation
c.
replacement
d.
synthesis

Separation of iron filings from its mixture with sulphur is an example of mixing and separation.

B.  mixing and separation

Explanation:

Separation techniques exploit various physical and chemical properties of substances. When a mixture undergoes separation it may result in two or more mixtures or even pure substances. Here separation of iron filings is achieved by making use of the magnetic property of iron.

Very few substances occur in pure form in nature. In order to obtain pure substances various separation techniques have to be employed. Examples of separation techniques are chromatographic separation, centrifugation, electrophoresis etc...

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Explanation: