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Describe four types of evidence of a chemical reaction. A color change, formation of a precipitate or a gas, or temperature changes are the evidences of a chemical reaction.
Similarly, you may ask, what are the 5 evidences of a chemical change?
Five different signs include odor, temperature change, precipitate formation, production of gas bubbles, and a color change.
- Gas Bubbles Appear. Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas.
- Formation of a Precipitate.
- Color Change.
- Temperature Change.
- Production of Light.
- Volume Change.
- Change in Smell or Taste.
Then, what are the evidences for a chemical reaction?
The following can indicate that a chemical change has taken place, although this evidence is not conclusive:
- Change of odor.
- Change of color (for example, silver to reddish-brown when iron rusts).
- Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.
The ten examples of chemical changes are :
- Burning of coal, wood, paper, kerosene, etc.
- Formation of curd from milk.
- Electrolysis of water to form hydrogen and oxygen.
- Rusting of iron.
- Bursting of a cracker.
- Cooking of food.
- Digestion of food.
- Germination of seeds.