21. Describe an activity to observe what happens when quick lime is added to water taken in a beaker. State two important observations and name the type of reaction taking place.
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3
Answer:
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Step-by-step explanation:
Aim: To observe what happens when quicklime is added to water taken in a beaker.
Materials Required:- Quicklime (calcium oxide), water, beaker.
Procedure:
- Take 5 g of calcium oxide in a beaker.
- Add water to it slowly.
- Touch the beaker.
- Note down the observations.
Observation: Calcium oxide reacts with water
vigorously to form calcium hydroxide with the evolution of heat.
Conclusion: The reaction between CaO (Calcium oxide) and H2O is a combination reaction. It is an exothermic process because heat is evolved.
Answered by
5
Answer:
i.Take small quantity of quick lime (CaO) in a beaker.
ii. Slowly add water to thequick lime (CaO) taken in the beaker.
iii. Touch the beaker with fingers and make a note of the change in temperature. Observations:
i. Quick lime reacts vigorously with water producing hissing sound.
ii. Beaker becomes hot.
Inferences:
Quick lime (calcium oxide) reacts with water vigorously to form calcium hydroxide and releases large amount of heat.
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