Question

2.Identify and write the chemical reaction from the given reactions:
1.Photosynthesis
2. Boiling of water 3. Tearing of paper 4. Conversion of milk into curd.​

Answer 1

Answer:

The process of photosynthesis is commonly written as: 6CO2 + 6H2O → C6H12O6 + 6O2. This means that the reactants, six carbon dioxide molecules and six water molecules, are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules, the products.

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.

Paper makers must remove the lignin from the wood pulp. To accomplish this, one of the main chemical reactions used in industry is the Kraft process, in which wood chips are combined with a mixture of sodium hydroxide and sodium sulfide in water at high temperature and pressure.

When the bacterium Lactobacillus is added to milk, it breaks down the lactose present in the milk to lactic acid. This increases the acidity of milk and urges the casein to coagulate. Lactobacillus uses lactose to fulfill its energy requirements. Hence, this change is irreversible