Question

state one example each characters by following along with chemical equation
a)change in state
b) Evolution of gas
c)change in temperature​

Answer 1

Answer:

(a) Change in state: The combustion reaction of candle wax (solid) melts initially to produce molten wax (liquid) and then produces carbon dioxide (gas) and water vapour (liquid). So, in this reaction, state of matter gets changed from solid to liquid and gas.

(b) Evolution of gas: When zinc granules react with dilute sulphuric acid in a flask, hydrogen gas evolves and zinc sulphate solution is formed.

Zn+ H2SO4→ ZnSO4+ H2↑⏐

(c) Change in temperature: When quicklime reacts with water, slaked lime is formed with a release of large amount of heat, causing change in temperature in the reaction mixture.

CaO +H2O →Ca(OH)2 + Heat

Answer 2

Explanation:

change in state - combustion of candle wax.

evolution of gas - zn + hcl = zncl2 +H2.

change in temperature - when quick lime reacts with water slaked lime is produced which is a chemic reaction.