Question

Part.c III. Answer in detail. 1. a) Explain the electrochemical reaction and thermo chemical reaction. b) Write down the chemical changes in the following: i) Spoilage of food and vegetables ii) Rancidity of fishes and meat iii) Apples and fruits turn brown when we cut. Part-D IV. Activity

Answer please​

Answer 1

Answer:

Part.c III. Answer in detail. 1. a) Explain the electrochemical reaction and thermo chemical reaction. b) Write down the chemical changes in the following: i) Spoilage of food and vegetables ii) Rancidity of fishes and meat iii) Apples and fruits turn brown when we cut. Part-D IV. Activity

Answer please​Part.c III. Answer in detail. 1. a) Explain the electrochemical reaction and thermo chemical reaction. b) Write down the chemical changes in the following: i) Spoilage of food and vegetables ii) Rancidity of fishes and meat iii) Apples and fruits turn brown when we cut. Part-D IV. Activity

Answer please​Part.c III. Answer in detail. 1. a) Explain the electrochemical reaction and thermo chemical reaction. b) Write down the chemical changes in the following: i) Spoilage of food and vegetables ii) Rancidity of fishes and meat iii) Apples and fruits turn brown when we cut. Part-D IV. Activity

Answer please​

Explanation:

Answer 2

Explanation:                            

1. a) Electrochemical reaction and thermochemical reaction

Electrochemical reaction      

• During an electrochemical reaction, electrons flow between a solid electrode and an electrolyte, causing an electric current to flow between the electrodes and a reaction to emit or absorb heat.

• For example, two electrodes in contact cause a reduction and oxidation (redox) reaction, resulting in a change in the oxidation numbers of all atoms involved in the reaction.    

Thermal decomposition reaction or thermal chemical reaction

• Thermochemical reactions are reactions where heat change takes place. If no conditions are given in a thermochemical reaction, the change in enthalpy is assumed to be ΔH₀.

There are two types of thermochemical reaction

1. Endothermic Reaction

• The thermochemical reaction that absorbs heat is called an endothermic reaction. This reaction has a positive change in enthalpy.
• An endothermic compound is a compound formed during an endothermic reaction.

2. Exothermic reaction

• Exothermic reactions are those in which heat or energy is released during the reaction. The enthalpy change for exothermic reactions is negative.
• An exothermic compound is a compound formed during an exothermic reaction.

b) Occurrence of Chemical changes

1. Spoilage of food and vegetables

• Food spoilage occurs when chemical reactions catalyzed by enzymes result in food quality degradation like the development of bad taste and smell, loss of nutrients, and deterioration.
• Oxidizing enzymes are naturally occurring enzymes found in food. These enzymes catalyze (increase the rate of) chemical reactions between oxygen and food components, resulting in food spoilage.
• Catalase and peroxidase are oxidizing enzymes that cause darkening in sliced and diced vegetables.  

2. Fish and meat rancidity:

• When exposed to the atmosphere or sunlight, fish and meat with high quantities of polyunsaturated fatty acids that oxidize produce a foul odor. This is referred to as rancidity.

3. Apples and fruits turn brown when cut

• When apples and some fruits are cut, they turn brown due to a chemical reaction with oxygen in the air. Browning is the name given to this chemical reaction.
• When the cells of apples, fruits, and vegetables react with oxygen, an enzyme present in fruits and vegetables called polyphenol oxidase or tyrosinase catalyzes a chemical reaction in which phenolic compounds are transformed into brown pigments known as melanins.