What is the difference between formation of gas in
a chemical reaction and evolution of gas in a chemical reaction
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Answer:Formation of gas doesn't necessarily mean that a chemical change has occured. Possibly, gas can be created from a chemical reaction, but a liquid turning into a gas is a physical reaction, not a chemical one. Natural gas, or methane, is the fuel used in many kitchen ranges. When it burns, no mass is lost, but just because the mass isn't lost doesn't mean that there's no color change, which is physical.
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