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the separation of a dye into the different colours that make up that dye, as a result of the dyes travelling at different speeds through paper.
the process during which nitrogen gas is converted into substances that can be used by plants,...
an atom of an element that loses or gains an electron and becomes electrically charged.
reversible reactions reach equilibrium, provided they occur in a closed container (closed system...
rechargeable cells, such as the lead acid accumulator used in motor vehicles.