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Which of the following statements is true for a chemical change?
- a)It is easily reversible.
- b)No energy is absorbed or released
- c)It involves the formation of a new substance.
- d)It does not affect the chemical composition of the substance.
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Which of the following statements is true for a chemical change?a)It i...
Physical and Chemical Change: Burning a Candle
Physical Change:
- In the process of burning a candle, the wax undergoes a physical change as it melts and changes from a solid to a liquid state.
- This change is physical because the chemical composition of the wax remains the same even though its physical state has altered.
Chemical Change:
- However, when the liquid wax is exposed to the flame of the candle, it undergoes a chemical change.
- The heat from the flame breaks down the hydrocarbons in the wax molecules, causing them to react with oxygen in the air and produce carbon dioxide and water vapor.
- This chemical reaction is what produces the light and heat energy that we see when a candle burns.
Conclusion:
- Therefore, the process of burning a candle involves both physical and chemical changes.
- The physical change occurs when the wax melts, while the chemical change occurs when the liquid wax reacts with oxygen to produce light and heat.
Physical Change:
- In the process of burning a candle, the wax undergoes a physical change as it melts and changes from a solid to a liquid state.
- This change is physical because the chemical composition of the wax remains the same even though its physical state has altered.
Chemical Change:
- However, when the liquid wax is exposed to the flame of the candle, it undergoes a chemical change.
- The heat from the flame breaks down the hydrocarbons in the wax molecules, causing them to react with oxygen in the air and produce carbon dioxide and water vapor.
- This chemical reaction is what produces the light and heat energy that we see when a candle burns.
Conclusion:
- Therefore, the process of burning a candle involves both physical and chemical changes.
- The physical change occurs when the wax melts, while the chemical change occurs when the liquid wax reacts with oxygen to produce light and heat.
Community Answer
Which of the following statements is true for a chemical change?a)It i...
Burning a candle involves both physical and chemical changes. The melting of wax is a physical change, while the burning of wax to produce light and heat is a chemical change.
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Which of the following statements is true for a chemical change?a)It is easily reversible.b)No energy is absorbed or releasedc)It involves the formation of a new substance.d)It does not affect the chemical composition of the substance.Correct answer is option 'C'. Can you explain this answer?
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Which of the following statements is true for a chemical change?a)It is easily reversible.b)No energy is absorbed or releasedc)It involves the formation of a new substance.d)It does not affect the chemical composition of the substance.Correct answer is option 'C'. Can you explain this answer? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about Which of the following statements is true for a chemical change?a)It is easily reversible.b)No energy is absorbed or releasedc)It involves the formation of a new substance.d)It does not affect the chemical composition of the substance.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is true for a chemical change?a)It is easily reversible.b)No energy is absorbed or releasedc)It involves the formation of a new substance.d)It does not affect the chemical composition of the substance.Correct answer is option 'C'. Can you explain this answer?.
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Solutions for Which of the following statements is true for a chemical change?a)It is easily reversible.b)No energy is absorbed or releasedc)It involves the formation of a new substance.d)It does not affect the chemical composition of the substance.Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 7.
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Which of the following statements is true for a chemical change?a)It is easily reversible.b)No energy is absorbed or releasedc)It involves the formation of a new substance.d)It does not affect the chemical composition of the substance.Correct answer is option 'C'. Can you explain this answer?, a detailed solution for Which of the following statements is true for a chemical change?a)It is easily reversible.b)No energy is absorbed or releasedc)It involves the formation of a new substance.d)It does not affect the chemical composition of the substance.Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of Which of the following statements is true for a chemical change?a)It is easily reversible.b)No energy is absorbed or releasedc)It involves the formation of a new substance.d)It does not affect the chemical composition of the substance.Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
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