(a) What happens chemically when quicklime is added to water? Write chemical equation of the reaction involved.
(b) What is 'Baking Powder'? How does it make the cake soft and spongy?
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Answer:
When quicklime (calcium oxide- CaO) is added to water, it reacts vigorously with water to produce slaked lime (calcium
hydroxide) and releases a large amount of heat.
The reaction that takes place is:
CaO + H2O → Ca(OH)2
Quick lime Slaked lime
The above reaction is an example of combination reaction in which calcium oxide and water combined together to form a single
product, calcium hydroxide.
B. Baking powder is mixed with the flour. When water is added to this flour to make dough, baking powder undergoes a chemical reaction during which carbon dioxide gas is produced. This carbon dioxide gas gets trapped into the dough and bubbles out which causes the cake to rise making it soft and spongy
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When Calcium oxide i.e. quick lime is added to water filled in a bucket, it reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat.
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