Please give answers for this.
Answer the following questions:
1. Why are decomposition reactions called the opposite of combination reactions?
2. Describe an activity to demonstrate the decomposition reaction of lead nitrate.
(a) Draw a labeled diagram of the experimental setup and list two main observations.
(b) Write a balanced chemical equation for the reaction.
3. What happens when water is added to Calcium Oxide?
(a) Mention and define the type of reaction and name the product formed.