Q9 of 33 Page 22

What happens chemically when quicklime is added to water?

When calcium oxide [quicklime] is added to water, it reacts vigorously with water to form calcium hydroxide [also known as slaked lime] with the liberation of large amount of heat.



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7

Classify the following chemical reactions as exothermic or endothermic:

A. Electrolysis of water


B. Burning of natural gas


C. Decomposition of calcium carbonate


D. Burning of magnesium ribbon in air

 8

What change will you observe if white silver chloride is placed in sunlight? Write an equation for the reaction and the type of the reaction.

 10

Explain the following terms:

Corrosion

 10

Explain the following terms:

Rancidity