4. Complete Activity 1.4 (Page 6).
- Take a small amount of calcium oxide or quick lime in a beaker.
- Slowly add water to this.
- Touch the beaker as shown in Fig. 1.3.
- Do you feel any change in temperature?
Answer:
Aim: To observe what happens when water is added to calcium oxide in a beaker and make conclusions.
Materials Required: Calcium oxide,water, beaker.
Procedure:
(i) A small amount of calcium oxide is taken in a beaker.
(ii) Then water is slowly added to the beaker. The observations are noted.
Observations:
The beaker becomes hot.
Conclusions:
- Calcium oxide reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat.
- This indicates the reaction is exothermic.
- The reaction is a combination reaction and is shown below:
CaO(s) + H2O(l) —> Ca(OH)2(aq) + Heat
“4. Complete Activity 1.4 (Page 6).
Do you feel any change in temperature?
Take a small amount of calcium oxide or quick lime in a beaker.
Slowly add water to this.
Touch the beaker as shown in Fig. 1.3.” – Solved.
Related Links:
Solution to Group Activity
Solution to Activity 1.1
Solution to Activity 1.2
Solution to Activity 1.3
Solution to Activity 1.4
Solution to Activity 1.5
Solution to Activity 1.6
Solution to Activity 1.7
Solution to Activity 1.8
Solution to Activity
Solution to Activity 1.9
Solution to Activity 1.10
Solution to Activity 1.11
