Question

Rahul and manav each were given a mixture of iron filings and sulphur powder .rahul heated the mixtre strongly and a new substance was formed .write three points of difference the two

Answer 1

Rahul's case: 1. Mixture of iron fillings and sulphur power forms compound FeS on heating sulphur has lost its original properties after reaction with Fe. 2.A black mass, ferrous sulphide (FeS) is obtained which is homogeneous. 3. Compound FeS does not show any reaction on heating..
Manav's case: 1. Iron fillings cling to magnet sulphur and iron retain its properties. 2. Appears as yellow powder in which some iron fillings is visible, i.e.,heterogeneous. 3. The mixture can be sepreted by magnetic seperation

Answer 2

Answer:

Chemical change occurs when a substance mixes with another and forms a new substance and physical change takes place without changing the composition of substances. The properties which can be measured or observed without changing the composition of the substance are known as physical properties.

Explanation:

• Both properties are kept when iron filings and sulphur powder are mixed together. It indicates that they haven't undergone any chemical alterations. A chemical reaction takes place when this combination is heated, producing ferrous sulphide (FeS).
• When iron filings and sulphur powder are combined and heated to a high temperature, iron sulphide is created.
• Sulfur has a lower melting point than iron. As a result, the sulphur melts first when we heat the mixture of iron filings and sulphur powder. Iron sulphide, a chemical compound with a dark colour, is created when the molten sulphur reacts with the iron fillings in the combination.
• $Fe + S === > FeS$

• Iron filings and sulphur powder are two reactants in the chemical reaction that occurs when they are combined and heated. This reaction results in the formation of ferrous sulphide, which is a single product.
• Sulfur powder and iron filings retain their characteristics when combined. Therefore, combining iron with sulphur is considered to be a physical alteration. But when sulphur powder and iron filings are combined and heated, chemical reactions occur that result in the creation of ferrous sulphide. Thus, heating the combination of sulphur powder and iron filings is considered to be a chemical change.
• When a combination of iron filings and sulphur powder is heated vigorously, ferrous sulphide will result.
• The mineral pyrite, often known as iron sulphide, is created. Because it frequently occurs in conjunction with gold deposits and has duped several eager miners with its brilliant golden look, it is known as "fool's gold" in nature.
• Iron sulphide may form fairly big cubic crystals when it crystallises underground from hot, pressurised water. This one isn't particularly large, but it is extraordinarily perfect and has a diameter of around one inch. The edges are razor sharp, just as they were when it emerged from the earth, and it hasn't been cut or polished.

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