answer me question no. 3,4,5 please don't spam
Answers
Answer:
3) Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust.
Here is the word equation for the reaction:
iron + water + oxygen → hydrated iron(III) oxide
Iron and steel rust when they come into contact with water and oxygen – both are needed for rusting to occur.
4)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.
5) 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:
1. LPG undergoes a phase change from liquid to gas during combustion.
2. Physical changes are reversible and do not involve a change in chemical composition, while chemical changes result in the formation of new substances.
3. The chemical reaction for rusting is: Iron (Fe) + Oxygen (O2) + Water (H2O) → Iron(III) oxide (Fe2O3) + Hydrogen gas (H2).
4. Tinning of iron sheets involves coating the surface with a layer of tin to protect it from corrosion.
5. Stainless steel contains a high amount of chromium, which forms a protective oxide layer that prevents the iron from reacting with oxygen and rusting.