Question

6. Give reasons for the following.
(a) Aluminium foils are used to wrap food items.
(b) Immersion rods for heating liquids are made up of metallic substances.
(c) Copper cannot displace zinc from its salt solution
(d) Sodium and potassium are stored in kerosene.


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Answer 1

Answer:

The material used in wrapping food items should be flexible, foldable and non-reactive with the food.

Aluminum is a soft and malleable metal.

It can be easily beaten into thin sheets to form wrapping foils.

Also, aluminum does not react with food items.

Hence, aluminum foils are used to wrap food items.

(b) Immersion rods are used for heating liquids.

The conductivity of heat and electricity of these rods should be good.

Metallic substances are

Good conductors of heat and electricity

Available easily at affordable prices.

Hence, immersion rods for heating liquids are made up of metallic substances.

(c)

Copper is less reactive than zinc.

In a salt solution,a less reactive metal cannot displace a more reactive metal.

Hence, copper cannot displace zinc from its salt solution.

(d) Sodium and potassium are very reactive with water, including moisture in the atmosphere.

They can catch fire even when they come in contact with air.

Kerosene contains no water and protects these metals from being exposed to any moisture in the air that would cause these metals to react.

Hence, sodium and potassium are stored in kerosene.

Answer 2

Explanation:

The day-to-day conditions of the atmosphere at a location concerning elements such as humidity, temperature, wind intensity, rainfall, etc. are called the weather at that location.

Complete step by step solution:

Elements of Weather and Climate:

1. Humidity –

Humidity is another weather element that cannot be seen but can be felt.

It not only plays a big part in weather formation but also directly influence our physical comfort levels.

2. Temperature –

Temperature is a measure of the amount of kinetic energy contained in the air that expresses itself externally by the perception of heat or cold.

Wind speed –

Airflow (wind) is one of the major guiding forces of the atmosphere.

Many large and even severe weather phenomena, such as cold and warm fronts, showers, thunderstorms, and hurricanes, are all powered by wind

3. Visibility –

Visibility may sound like a very unlikely feature of weather, but it is highly critical when discussing and calculating weather conditions such as fog, mist, freezing drizzle, and smog.

4. Precipitation –

Rainfall, Snow, Hail, or graupel

Precipitation is water in its multiple forms, which form after condensation, converting water vapour into its liquid or solid form, which falls to the earth after it becomes too hot to remain floating in the air.

5. Clouds –

Clouds are one of the best ways to assess present and predicted weather patterns.

Clouds are water droplets or water in various states (like ice and snow crystals) that emerged after water vapour had reached the level of condensation and could no longer exist in gaseous form.

6. Air pressure -

Air pressure is another main aspect of weather, particularly when it comes to developing or altering atmospheric conditions

Note:

Climate refers to the sum-total of environmental patterns and fluctuations over a wide region over a long period (more than thirty years).

Weather refers to the state of the ambient e over the area at any moment.

The elements of nature and climate are the same, i.e. temperature, air pressure, wind, humidity, and rainfall.