Question

Observations that help determine a chemical reaction

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Answer 1

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A chemical reaction can be determined with the help of any of the following observations:-

a) Evolution of a gas

b) Change in temperature

c) Formation of a precipitate

d) Change in colour

e) Change of state

Answer 2

Explanation:

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1. Gas Bubbles Appear. Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas.
2. Formation of a Precipitate.
3. Color Change.
4. Temperature Change.
5. Production of Light.
6. Volume Change.
7. Change in Smell or Tasted.