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rusting and burning are chemical change because their molecules undergo certain changes which cant be brought back during the process.
in these reaction is a new substance is formed and the properties of the new material is different form the properties of original one
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When Iron is exposed to humid atmosphere, oxygen reacts with iron to form ferric oxide. Fe₂ O₃. It has different color and physical properties.  It is not possible to obtain iron and oxygen from iron oxide in a normal way.  The molecules of iron and oxygen react chemically forming a new molecule.

When the candle is burnt, the wax containing complex carbon (organic) compounds decompose in various stages at different temperatures. It gives rise to carbon dioxide and other gases. It is chemical change as molecular structure of wax is decomposed into simpler organic compounds.

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