Shan was observing a construction work in his neighbourhood. Labourers were whitewashing the walls. He also, noticed that a man was painting the Iron railing and door latches. It remained Shan such of a chemical reaction,
a. Which type of reaction is involved in whitewashing?
b. The wall becomes Shans after whitewashing. Why?
c. Which reaction would have come to Shans mind when he saw Iran railing and door latches being
painted?
d. What is the associated life skill?
Answers
Answer:
a.Chemical Reactions and Equations. When we white-wash the walls, then first calcium oxide (oxide) is made to react with water to form calcium hydroxide. The calcium hydroxide is then applied to the walls, which slowly reacts with the carbon dioxide gas present in air to form a thin shining layer on the walls.
b.In whitewash Calcium hydroxide is present. Calcium hydroxide reacts slowly with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls. Calcium carbonate is formed after two to three days of white washing and gives a shiny finish to the walls.
c. l don't know the answer
d.Life skills' are defined as psychosocial abilities for adaptive and positive behaviours that enable individuals to deal effectively with the demands and challenges of everyday life.