Answer to Question #61009 in Physical Chemistry for abrar

Question

Example of physical chemistry

Answer 1

1. Dissolution of sulfuric acid in water is running with producing heat, that proves that among physical procces of diffusion the chemical processes also happens. It is the formation of new compounds - solvates, in this occation - hydrates (H2SO4 · nH2O). The formation of new compounds always happens with producing some heat.
2. Dissolution of nitrates in water is running with reducing heat of the system, because more energy is required for breaking bonds between the ions in crystal than it produces.
3. Getting the solution of potassium permanganate and its dilution.
That shows that molecules and ions are moving all the time, water molecules destruct the crystalls of potassium permanganate while dissolving. Molecules and ions are very small and their quantity is extremely great in the flask with the solution.
4. Potassium permanganate thermal decomposition for producing oxygen gas. Its gathering by (a) replacing of water, (b) replacing of air.
Prosses conditions (the position of tube while heating, the position of flasks while gathering the gas) is important for safety and succes. Oxygene physical properties (for example, density in comparison with air, water) is payed to attention while providing this chemical reaction.
5. Hydrogen peroxide decomposition in presense of MnO2 like contact substance. Contact substance properties is also a field of Physical Chemistry.