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Which of the following is not an example of the changes that occur by mixing two substances?
- a)Salt dissolved in water
- b)Mixing sand and water
- c)Burning of a matchstick
- d)Sugar dissolved in water
Correct answer is option 'C'. Can you explain this answer?
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Which of the following is not an example of the changes that occur by ...
Explanation:
The correct answer is C: Burning of a matchstick. This is not an example of the changes that occur by mixing two substances because it involves a chemical reaction rather than a physical mixing of substances.
Here is a detailed explanation of each option:
- A: Salt dissolved in water: This is an example of a physical change that occurs when salt is mixed with water. The salt particles disperse and become evenly distributed throughout the water, forming a solution.
- B: Mixing sand and water: This is also an example of a physical change. The sand particles mix with the water, but they do not chemically react with each other. The sand particles can be separated from the water by filtration.
- C: Burning of a matchstick: This is a chemical change, not a physical change. When a matchstick is burned, a chemical reaction occurs between the matchstick and the oxygen in the air. This reaction produces heat, light, and new substances, such as ash and smoke. It is not a result of mixing two substances.
- D: Sugar dissolved in water: This is another example of a physical change. When sugar is mixed with water, the sugar particles disperse and become evenly distributed throughout the water, forming a solution. The sugar can be separated from the water by evaporation.
In summary, option C (Burning of a matchstick) is not an example of the changes that occur by mixing two substances because it involves a chemical reaction rather than a physical mixing of substances.
The correct answer is C: Burning of a matchstick. This is not an example of the changes that occur by mixing two substances because it involves a chemical reaction rather than a physical mixing of substances.
Here is a detailed explanation of each option:
- A: Salt dissolved in water: This is an example of a physical change that occurs when salt is mixed with water. The salt particles disperse and become evenly distributed throughout the water, forming a solution.
- B: Mixing sand and water: This is also an example of a physical change. The sand particles mix with the water, but they do not chemically react with each other. The sand particles can be separated from the water by filtration.
- C: Burning of a matchstick: This is a chemical change, not a physical change. When a matchstick is burned, a chemical reaction occurs between the matchstick and the oxygen in the air. This reaction produces heat, light, and new substances, such as ash and smoke. It is not a result of mixing two substances.
- D: Sugar dissolved in water: This is another example of a physical change. When sugar is mixed with water, the sugar particles disperse and become evenly distributed throughout the water, forming a solution. The sugar can be separated from the water by evaporation.
In summary, option C (Burning of a matchstick) is not an example of the changes that occur by mixing two substances because it involves a chemical reaction rather than a physical mixing of substances.
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Which of the following is not an example of the changes that occur by mixing two substances?a)Salt dissolved in waterb)Mixing sand and waterc)Burning of a matchstickd)Sugar dissolved in waterCorrect answer is option 'C'. Can you explain this answer?
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