Question

What is rusting of iron? What conditions are required for rusting to take place?​

Answer 1

Answer:

Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Iron and steel rust when they come into contact with water and oxygen – both are needed for rusting to occur.

Answer 2

Answer:

Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Iron and steel rust when they come into contact with water and oxygen – both are needed for rusting to occur.

Explanation:

4. Why does the chest swell when we breathe in?

Ans: When we breathe in the outside air enters the body and hence the

chest swells.

5. Why is the brain situated in the casing of the skull?

Ans: The brain is the most important internal organ. If there is injury to the

brain, a person can become disabled or even die. Therefore , the brain is

situated in the casing of the skull.

IV) Give reason.

1. Blood must be kept flowing in the blood vessels throughout the body.

Ans: Blood carries air and nutrients from the digested food to every part of

the body. Hence, blood must be kept flowing in the blood vessels

throughout the body.

V) Match the following.

A ANSWER

1.Blood supply - Heart

2. Breathing - Lungs

3. Carrying food to the stomach- Alimentary canal

4. Controlling movements Brain