A student heated a mixture of Iron filings and Sulphur strongly. She saw a red glow spread through the mixture
as the reaction continued. In the end a black solid has been formed according to the following reaction -
Fe +S → FeS
a) Write a word equation for the reaction mentioned above.
b)What does the red glow indicate. Define the term used for it.
c) State two differences between Mixture (Iron and sulphur) and the black solid Compound formed in
the given reaction
Answers
Answer:
When sulphur and iron filings are mixed and heated they form FeS (ferrous sulphide). The FeS is in black colour.
Fe+S⟶FeS
Black colour compound.
So, the correct option is (B)
Explanation:
a) The word equation is
Iron and Sulphur react to give Ferrous Sulphide.
b) The red glow indicates that it is an exothermic reaction.
An exothermic reaction is a reaction that proceeds with the release of a large amount of heat energy.
c) => The mixture Iron + Sulphur can easily be separated using a magnet or a solvent such as Carbon Disulphide.
=> The elements in the compound Iron Sulphide cannot be separated by any physical means and only by chemical means such as electrolysis.
=> When Hydrochloric acid is poured over the mixture, an odourless gas is evolved (Hydrogen that burns with a characteristic pop sound, this happens when the acid reacts with iron metal, which is not chemically combined with sulphur in the mixture.
=> When Hydrochloric acid is poured over the black solid that is formed, a rotten egg smelling gas is liberated (Hydrogen Sulphide).