Final answer:
Sodium burns to produce a bright yellow color. Copper(II) sulfate can be prepared by reacting copper hydroxide with sulfuric acid. Crystallization in salt preparation involves the slow evaporation of water. The rate of diffusion is influenced by molecular mass.
Step-by-step explanation:
When sodium is burned, it produces a bright yellow color. This is because the energy from the burning process excites the electrons in the sodium atoms, causing them to emit light in the yellow part of the visible spectrum.
Copper(II) sulfate can be prepared by reacting copper hydroxide with sulfuric acid. The reaction is as follows:
Cu(OH)2 + H2SO4 -> CuSO4 + 2H2O
The crystallization process in salt preparation involves dissolving a salt in water, then allowing the water to evaporate slowly. As the water evaporates, the salt molecules come closer together and form a regular, repeating pattern called a crystal.
The rate of diffusion is affected by the molecular mass of a substance. Larger molecules have a slower rate of diffusion compared to smaller molecules, because they have more mass and move more slowly.