Please answer 2,4 &5
2. When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical changes involved in the two cases.
4. (a) What is synthesis?
(b) What kind of chemical reaction is synthesis ?
Support your answer by an example.
5. Decomposition brought about by heat is known as thermal decomposition. What is the difference between thermal dissociation and thermal decomposition.
Dear student,
2.
In the first, the formation of water is a combination reaction.
The second is a decomposition reaction.
4.
(a) Synthesis means to produce or manufacture.
2.
In the first, the formation of water is a combination reaction.
The second is a decomposition reaction.
4.
(a) Synthesis means to produce or manufacture.
(b)
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