Explain the term 'Energy Changes in a chemical reaction'. Give an example
with balanced equation for each of the reactions:
1. Exothermic Reaction
2. Endothermic Reaction
3. Photochemical Reaction
4. Electrochemical Reaction
Answers
Explanation:
Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.
Some examples of Exothermic processes are:
1.Combustion of fuels such as wood, coal and oil petroleum.
2.Thermite reaction.
Endothermic Reaction Examples
These ions go on to form ammonium hydroxide (NH4OH) and nitric acid (HNO3) respectively (by reacting with the OH– and H+ ions in water).
The example of photochemical reaction is photosynthesis. ... The photons from the light energy split water and enable ATP production that drives the entire process.
Electrochemical Reaction
Iron supplies electrons at the edge of the droplet to reduce oxygen from the air - the iron surface inside the droplet acts as the anode for the process.
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