Small solar term empty bottle

(1) Knowing the reactants and products, we can write the chemical equation NH 3+HCl = NH 4cl. From the figure of microscopic particles, it can be concluded that in chemical changes, molecules can be separated and atoms cannot be separated (which is reasonable according to the law of conservation of mass);

(2) Observe that the plastic bottle becomes deflated. The reason is that the gas reacts to produce solids, and the pressure in the bottle is small.

So the answer is: (1) NH3+HCl = NH4Cl; In chemical changes, molecules can be separated, but atoms cannot be separated;

(2) The gas is consumed to generate solids, and the pressure in the bottle is less than the external atmospheric pressure.