Question

Chapter 3: Changes and Reactions
Very-short-answer oral questions
1. What conditions are needed for rusting?
2. Name a solid which changes directly into vapour on being heated.
3. Is energy absorbed or evolved in the condensation of vapours?
4. Is the burning of carbon in air a combination reaction or a decomposition reaction?
5. What sort of reaction takes place when baking soda is heated?
6. What happens when an iron nail is immersed in a copper sulphate solution?
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Answer 1

Answer:

not know sorry have a good day

Answer 2

Answer:

Rusting : when iron is exposed to moist air, it gets coated with hydrated iron oxide. This process is called rusting and the coating formed is called rust