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4 June, 00:52

Which of the following is a chemical change?

A.) A mixture of sulfur and iron filings are heated until the contents glow red and the appearance of the mixture changes. A magnet can no longer remove iron filings.

B.) A mixture of sulfur and iron filings are placed in carbon disulfide, the sulfur dissolves, leaving iron behind in the bottom of the beaker.

C.) Sulfur and iron filings are mixed together and the iron is removed with a magnet.

D.) Sulfur and iron filings are mixed together in a beaker at room temperature.

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  1. 4 June, 01:34
    0
    A) A mixture of sulfur and iron filings are heated until the contents glow red and the appearance of the mixture changes. A magnet can no longer remove iron filings.

    Explanation:

    Chemical change is a change which brings a change in the composition of the substance.

    When sulphur and Iron fillings are heated a chemical reaction takes place which leads to the formation of FeS.

    FeS is a new substance which has completely a different property than that of Iron.

    Iron has magnetic property gets attracted to the magnet.

    FeS formed is no longer attracted to the magnet. A magnet can no longer remove iron filings because all the iron have been converted to FeS.
  2. 4 June, 02:10
    0
    A.

    Explanation:

    A. The heating instigates a chemical reaction in which the compound Iron Sulphide has been made.
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