Diffusion is the movement of a substance from an area of high concentration to an area of lower concentration. Diffusion occurs in liquids and gases when their particles collide randomly and spread out.
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Water and sodium hydroxide are both compounds. If you look at the Periodic table, you will see that sodium has a mass number of 23, oxygen has a mass number of 16 and hydrogen has a mass number of 1.
A reaction may happen when two or more chemicals are mixed. Sometimes you have to add heat (energy) before the reaction will occur. Not all chemicals react together when they are mixed.