Question

1. Distinguish between physical and chemical changes.
2. Write the worded chemical reaction that occurs during rusting.
3. Describe tinning of iron sheets.
4. Iron rusts, whereas stainless steel which contains large quantity of iron does not. Explain.​

Answer 1

Answer:

• 1)Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

• 2)Rust is formed when iron reacts with oxygen in moist air. The following chemical equation represents the reaction: 4Fe + 3O2 → 2Fe2O3. Water is necessary for the oxidation reaction to occur and to facilitate transport of the electrons.

• 3)Tinning is the process of thinly coating sheets of wrought iron or steel with tin, and the resulting product is known as tinplate. The term is also widely used for the different process of coating a metal with solder before soldering. ... They are now made of steel, either Bessemer steel or open-hearth.

1. 4)Iron is completely made of the iron compound so it rusts whereas stainless steel is an alloy, i.e, homologous mixture of various metals . So the other elements in the alloy doesn't allow it to rust.

Answer 2

Answer:

Physical changes only change the appearance of a substance, not its chemical composition.

Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

Rust is formed when iron reacts with oxygen in moist air. The following chemical equation represents the reaction: 4Fe + 3O2 → 2Fe2O3. Water is necessary for the oxidation reaction to occur and to facilitate transport of the electrons.

Tinning is the process of thinly coating sheets of wrought iron or steel with tin, and the resulting product is known as tinplate. The term is also widely used for the different process of coating a metal with solder before soldering. ... They are now made of steel, either Bessemer steel or open-hearth.

Iron is completely made of the iron compound so it rusts whereas stainless steel is an alloy, i.e, homologous mixture of various metals . So the other elements in the alloy doesn't allow it to rust.

Step-by-step explanation:

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