Question

Identify and write the chemical reaction from the given reaction:
(1) photosynthesis
(2) Boiling of water
(3) Tearing of paper
(4) conversion of milk into curd.​

Answer 1

Answer:

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Explanation:

1. The photosynthesis chemical equation states that the reactants (carbon dioxide, water and sunlight), yield two products, glucose and oxygen gas. The single chemical equation represents the overall process of photosynthesis. ... Chlorophyll is a pigment that absorbs sunlight energy.
2. First, as seems obvious, chemical reactions are linked to change but not all change involves a chemical reaction. When liquid water boils or freezes it undergoes a change of state (a phase change), but the water molecules remain intact - they are still discrete water molecules, H2O.
3. Tearing of paper is an example of physical change. Before and after the tearing of paper its composition is still the same although it changes in size and shape. Meanwhile, the burning of paper is an example of a chemical change. Before and after the burning the composition of paper changes into ashes.
4. Milk is converted into curd or yogurt by the process of fermentation. Milk consists of globular proteins called casein. Here curd forms because of the chemical reaction between the lactic acid bacteria and casein. During fermentation, the bacteria use enzymes to produce energy (ATP) from lactose.

Answer 2

Answer: (1) photosynthesis and (4) conversion of milk into curd are two chemical reactions from the given options.

Explanation:

• The process of photosynthesis is commonly written as:

                       6CO2 + 6H2O → C6H12O6 + 6O2.

Carbohydrates are produced  by the application of external energy, light, and chlorophyll with the involvement of oxygen through the process of carbon assimilation performed by the combination of water and carbon dioxide. The complete chemical reaction is called photosynthesis. It converts six carbon dioxide molecules and six water molecules, which are reactants, into one sugar molecule and six oxygen molecules (products) by the light energy captured by chlorophyll .

• Boiling water is a physical change in that the resulting gaseous water  is chemically identical to  liquid water. That is, both  have the same water molecular structure.

• Tearing  paper is an example of physical change. Before and after tearing the paper, the size and shape change, but the composition is  the same.

• Milk is fermented into quarks or yogurt. Milk is made up of globular proteins called casein. Quarks are made here by the chemical reaction of lactic acid bacteria and casein. During fermentation,  bacteria use enzymes to convert lactose into energy (ATP).

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