Question

give an example of a chemical reaction for each of the following a heat are produced b a change in smell takes place c a change in colour is observed d a gas is evolved ​

Answer 1

Na + Hcl = Nacl + H2 released

Answer 2

Answer:

burning of any substance like roti (chapati/bread )

Explanation:

observation....

1. heat we give
2. heat we givesmell is changed
3. heat we givesmell is changedcolour is changed

• not reversable!