A) Sodium and chlorine forming salt, in this reaction salt is a new product with different properties than sodium or chlorine
Therefore it is a chemical reaction
B) A candle burning to form carbon dioxide, in this reaction carbon dioxide is a new product with different properties than the candles wax
Therefore it is a chemical reaction
C) Marshmallow releasing carbon is similar to the above one
Therefore it is a chemical reaction
D) Ice turning into water, in this reaction the water can be transformed into ice by freezing it
Therefore it is not a chemical reaction
The answer to your question is D) Ice turning into water
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