Question

Five characteristics of chemical reactions with examples.....

Answer 1

Answer:

Characteristics of Chemical reaction are -

■1. Evolution of Gas

■2. Change in state

■3. Change in colour

■4. Change in temperature

■5. Formation of precipitate

Answer 2

1. Evolution of gas eg: reaction between zinc and dilute sulphuric acid to form hydrogen gas
2. Formation of precipitate eg : reaction between potassium iodide and lead nitrate to form yellow precipitate of lead iodide
3. Change in colour eg: when citric acid react with potassium permanganate(purple) then purple colour disappears.
4. Change in temperature eg: reaction between zinc granules with dilute sulphuric acid.
5. Change of state eg: when wax(solid) is burnt then water(liquid) and carbon dioxide(gas) are formed