Question

give the correct answer..?​

Answer 1

11)

¡)Corrosion: It is the process in which metals are slowly eaten up by the action of air moisture or chemicals.eg:: .Rusting of iron and steel is perhaps the most common example of metallic corrosion. There are many well-known examples such as the rusting of exhaust systems and bodies of cars, water pipes and various types of structural steel-work. There are other examples of corrosion in everyday life.

¡¡) Rancidity: When the substance containing oils and fats are exposed to air they get oxidised and become rancid due to which their smell, taste and colour change. This process is known as rancidity.

eg:

An example of rancidity is when a chips pack is exposed to atmospheric air which results in a change in taste and odor.

12)

A reaction which has an equal no.of atoms of all elements on both sides of a chemical equation is called a balanced equation. The law of conservation of mass state that mass can neither created nor destroyed. hence in a chemical reaction, total mass of reactants should be equal to total mass of products. It means that total no.of atoms of each element should be equal on the both sides of a chemical equation that's why chemical should be balanced.

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Answer 2

Question:-

☞11. Explain the following terms with one example each

i) Corrosion

ii) Rancidity

☞12. What is balanced chemical equation? Why should chemical equation be balanced?

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Required Answer:-

11. i) Corrosion:

➝The gradual eating up of metals by action of air, moisture or a chemical reaction (such as an acid) on their surface is called corrosion.

➝The most commonly seen example of corrosion of metals is rusting of iron.

ii) Rancidity:

➝Rancidity is a condition in which the substance with oil and fats get oxidized when they are exposed to air. A substance is said to be rancid when there is a change in smell, taste, and colour.

➝An example of rancidity is when a chips pack is exposed to atmospheric air which results in a change in taste and odor.

12. ➝A balanced chemical equation has number atoms of each element equal on both left and right sides of the reaction.

➝A chemical equation must be balanced because the Law of Conservation of matter must be hold good during a chemical equation. Balancing of equation is necessary because atoms are neither created nor destroyed during a chemical equation.

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Hope it helps you!☺️.