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Seeing signs of a chemical reaction does not always mean that a reaction is happening. For example, a gas (water vapor) is given off when water boils. ... You can tell that it is a physical change because water vapor can condense to form liquid water. In a chemical change, a new substance must be produced.

Answer:

Seeing a gas produced not always means a chemical reaction is occurring.

Explanation:

The following clues for an occurrence of a chemical reaction:

  • Color: The color of the solution changes when mixed with another solution or on the addition of a solid to a solution.
  • Temperature: Rise or fall in temperature of the substance formed
  • Precipitation: Formation of solid substance that is precipitate
  • Gas evolution: Bubbles or gas formation. Evolution of gas or fumes from the solution.
  • Odor: The smell of the reacting mixture initially differs from the smell of the products

Yes, gas formation is one of the clues of the occurrence of a chemical reaction but it is not completely true.

  • This is because the evolution of gas also occurs when a substance undergoes a physical change.
  • Water vapors on boiling water, sublimation of dry ice giving carbon dioxide gas.

So, from this, we can conclude that seeing a gas produced not always means a chemical reaction is occurring.

Learn more about observations of chemical reactions here:

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