Question

1 point
30. Iron filings and sulfur
powder are mixed thoroughly,
then the mixture is heated
strongly to produce iron
sulfide. The changes involved
are respectively *
O physical and physical
O physical and chemical
O chemical and physical
O chemical and chemical​

Answer 1

Answer:

When iron filings and sulphur powder are mixed, both retain their properties. It means they have not undergone any chemical reaction. Therefore, mixing of iron and sulphur is a physical change. When iron filings and sulphur powder are mixed and heated they undergo a chemical reaction and form ferrous sulphide (FeS).

Answer 2

Answer:

The changes involved are physical and chemical changes.