Question

General Chemistry

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Analysis Based: [Any 2 in less than 200 words]

1. The sun emits a lot of heat and light, what kind of reaction happens in the sun.

2. List out 5 activities/phenomenon where you see the influence of chemistry your daily life

3. Has Chemistry benefitted Human Life? Support your view with 2 important incidents from history.

4. Research and write the incident/scientist [less than 200 words] that led to the discovery of

 Pencillin

 Radioactivity

 Insulin

Answer 1

1) Answer

The sun emits a lot of light and heat. The nuclear reaction named proton proton cycle occurs in the sun. This cycle involves combination of 4 hydrogen atoms leads to formation of helium atom, in this process it leads to production of energy. This energy is mainly in the form of gamma rays. This cycle will happen in the central region that is core region. This is the hottest region of the sun. Produced energy in this core region is out by the process of radiation. Throughout the regions of the sun is not followed by this radiation process but it follows another process called convection. In addition to helium production, it also involves the formation of some particles called neutrinos, it supports the generation of energy.

2)

Heating of water : When we heat the water, it starts boiling when it reaches to 100 degree C. We know that Boiling point of water is 100 ^oC

Curd preparation: When we are preparing curd, It involves chemical reaction. That is between Casein in the milk and Lacto bacillus.

Checking body temparature: We will use thermometer to the check the temparature of the body. It involves the prcoess of thermal expansion. When mercury in the thermometer gets heat it will expanded by its volume. It give us reading of our body temparature.

Use of soaps: Soap contains both hydrophilic(water loving) and hydrophobic(water hating) molecules.Hydrophobic and hydrophilic ends react with oil to remove and cleans it.

Pickling: It involes adding extra salt to it this means addition sodium chloride. By the process of osmosis it works to preserve the Pickle from decomposition or degradation. Adding to this decomposition of pickles or vegetables are also a process of Chemical reaction.