Which of these necessarily changes during a chemical change?
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When chemical reactions occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated. An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen.
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a) Smell
b) Taste
c) Colour
d) Evolution of gas
b) Taste
c) Colour
d) Evolution of gas
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