A poem about decomposition reaction

(1) Calligraphy and painting written with ink can be preserved for many years, because the main component of ink is carbon, and the chemical properties of carbon are very stable at room temperature, so it is not easy to react with other substances, so the answer is: the chemical properties of carbon are very stable at room temperature;

(2) The material change embodied in the poem "A thousand hammers hew out a deep mountain" is physical change; The chemical reaction embodied in "burning with fire is idle" needs to be carried out at high temperature when limestone is decomposed. The chemical equation of this reaction is: CaCO3? High temperature? . ? CaO+CO2↑ belongs to decomposition reaction;

(3) "Keep innocent in the world" means that lime water can react with carbon dioxide in the air to generate calcium carbonate and water, so the answer is:

Calcium hydroxide+carbon dioxide = calcium carbonate ↓+H2O.

So the answer is:

(1) Calligraphy and painting are all written or drawn with ink. The main component of ink is carbon, and its chemical properties are stable at room temperature.

(2) physics; Decomposition;

(3) Calcium hydroxide+carbon dioxide = calcium carbonate ↓+H2O.