Explanation:
Graphite's layered structure with weak van der Waals forces between layers allows them to slide over each other, making it a good dry lubricant. It is used in machines where oil cannot be used (high temperature) or in pencil lead mixed with clay. Diamond is hard, used as abrasive. Fullerenes are nanomaterials, not lubricants. Coal is fuel.
Explanation:
Aluminium displaces iron from iron(III) oxide because Al is more reactive. This is a single displacement (or thermite) reaction. Also redox: Al oxidized, Fe reduced. Combination: one product; decomposition: one reactant.
Explanation:
Electroplating is the application of electrolytic cells to deposit a thin, protective, or decorative layer of a metal (like gold, silver, or chromium) onto a conductive object. Electrolysis is the general process of using electricity to drive a non-spontaneous chemical reaction.
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