Check chemical reactions (around 10) observed in kitchen ( like corrosion of copper vessels, oxidation of cut apples etc.) & write related word reactions or equations.
Answers
Chemical reaction observed in Kitchen :
1. Cut vegetables like apple turns to brown colour because apple cells contain an enzyme called polyphenol oxidase. When this comes in contact with oxygen present in the environment, it turns the phenolic compounds present in the apple tissues into brown-colored products, imparting a brownish colour to freshly cut apple.
2. Rusting of Iron :
The browning of iron, when left for sometime in moist air, is a process commonly known as rusting of iron. This process is basically oxidation reaction which requires both oxygen and water.
4Fe +3O₂+2H₂O---->2Fe₂O₃.H20
3. Tarnishing of silver : Silver articles turn to black colour.
4Ag + 2H₂S + O2 -> 2Ag₂S + 2H2₂O
4. Corrosion of Copper articles :
Corrosion is the oxidative deterioration of a metal. we can see Green coating on copper articles on exposure to air.
2Cu + O₂ +Co2+H2O--->Cu(OH)2+CuCO3
5. Baking of bread/cake:
Baking powder is added to added to bread mould so that it becomes spongy and puffy.
6. Baking soda is used for faster cooking.
2NaHCO3 → Na2CO3 + H2O + CO2
7.Burning of candle involves Chemical and physical change
Wax on heating will give two new products Co2 and light energy.
8. Combustion of fuel[ LPG stove]: LPG fuel contains propane and butane gas .
C3H8+5O2---->3 CO2 + 4H2O
9. Mixing of an acid and base like :
Vinegar + baking soda ---< salt + water
10.Burning of wood is an combustion reaction.