Combined gas law combines Boyle's, Charles', and Gay-Lussac's laws for a fixed mass of gas. It relates P, V, T when all change. PV=nRT is ideal gas equation for n moles.
Explanation:
Fractional distillation is the primary separation method in refining. Cracking breaks larger hydrocarbons into smaller ones (gasoline). Reforming alters structure to improve octane rating. Polymerisation combines small molecules. Fractional distillation separates based on boiling points in a fractionating column.
Explanation:
Elements in the same vertical column (group) have the same number of electrons in their outermost shell (valence electrons). This gives them similar chemical properties. The number of shells increases as we go down a group, leading to trends in atomic radius and ionization energy.
Explanation:
Iodine directly converts from solid to violet vapor on gentle heating (sublimation). NaCl melts; sugar decomposes; copper melts at high temperature. Other sublimable substances: camphor, naphthalene, dry ice.
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