Which of the following is not an example of a chemical change? 1. melting snow 2- tarnished spoon 3. forming a precipitate 4. respiration

1) Melting snow

A chemical change occurs when the chemical composition of a substance is changed. A physical change affects the physical properties of the substance, such as a change in the state of matter or changing the shape or size of the substance. Since melting snow is simply a change from the solid state to liquid state, it is a physical change, not a chemical change. 

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