Which is john shows the complete burning of the wax?
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The alkali metals have low melting and boiling points compared to most other metals. Apart from the other alkali metals, only three metals (indium, gallium and mercury) have lower melting points than lithium. You can see from the graph that lithium, at the top of Group 1, has the highest melting point in the group
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Melting of wax is reversible change because it can be shaped again
Burning of wax is irreversible change because when it is burned it get evaporated.
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