Question

2. Explain the process of Soil Treatment

3. Explain chemical and Physical changes?

4. Explain Rusting of Iron

5. Explain the planning required in advance to deal with a cyclone.

6. Explain with example how air expands on heating.​

Answer 1

Explanation:

2.Options for treating soil includes:

Biological treatment/bioremediation uses bacteria to break down substances in the soil. Chemical oxidation converts contaminated soils into non-hazardous soils. Soil stabilisation involves the addition of immobilizing agents to reduce a contaminants' leachability.

3.physical and chemical changes:

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.

4.Rusting of iron:

Rusting of iron is an example of a redox reaction. During rusting, iron combines with oxygen in the presence of water. This is an oxidation reaction where oxygen acts as an oxidising agent. Since oxygen also combines with the metal iron, this is a reduction reaction, where the metal iron acts as a reducing agent.

5.To deal with cyclone, it is important to follow the following points.

(i) Carefully listening the warnings transmitted on T.V. and radio.

(i) Carefully listening the warnings transmitted on T.V. and radio.(ii) Moving to the safer places.

(i) Carefully listening the warnings transmitted on T.V. and radio.(ii) Moving to the safer places.(iii) Keeping an emergency kit ready.

(i) Carefully listening the warnings transmitted on T.V. and radio.(ii) Moving to the safer places.(iii) Keeping an emergency kit ready.(iv) Store food in waterproof bags.

(i) Carefully listening the warnings transmitted on T.V. and radio.(ii) Moving to the safer places.(iii) Keeping an emergency kit ready.(iv) Store food in waterproof bags.(v) Not venturing into sea.

(i) Carefully listening the warnings transmitted on T.V. and radio.(ii) Moving to the safer places.(iii) Keeping an emergency kit ready.(iv) Store food in waterproof bags.(v) Not venturing into sea.(vi) Keeping all the emergency numbers.

6. As air warms up, the molecules start to vibrate and bump into each other, increasing the space around each molecule. Because each molecule uses more space for motion, the airexpands and becomes less dense (lighter). ... The opposite effect happens when air cools.

example:

When the bottle is placed in hot water, the balloon expands. When the bottle is placed in cold water, it contracts. Inference: This happens because when the bottle is placed in hot water, the air in it becomes warm and expands due to which balloon also expands.