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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion : Burning a match stick is a chemical change.
Reason : Chemical changes are irreversible changes whereby the chemical composition also changes and a new substance is formed.
  • a)
    Both (A) and (R) are true, and (R) is the correct explanation of (A).
  • b)
    Both (A) and (R) are true, but (R) is not the correct explanation of (A).
  • c)
    (A) is true, but (R) is false.
  • d)
    (A) is false, but (R) is true.
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Direction: In the following questions, a statement of Assertion (A) i...
Burning a match stick is an irreversible (chemical) change because when we burn it, it produces smoke and turns into ash.
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Direction: In the following questions, a statement of Assertion (A) i...
**Assertion: Burning a matchstick is a chemical change.**
**Reason: Chemical changes are irreversible changes whereby the chemical composition also changes and a new substance is formed.**

The correct answer is option 'A': Both (A) and (R) are true, and (R) is the correct explanation of (A).

**Explanation:**

**Chemical Change:**
A chemical change refers to a process in which one or more substances are converted into different substances with different chemical properties. In a chemical change, the chemical composition of the substances involved is altered, resulting in the formation of new substances.

**Physical Change:**
On the other hand, a physical change refers to a process in which the physical properties of a substance change, but its chemical composition remains the same. In a physical change, no new substances are formed.

**Burning of a Matchstick:**
When a matchstick is burned, it undergoes a chemical change. The process of burning involves the combustion of the matchstick, which is a rapid chemical reaction between the matchstick and oxygen in the air. During this process, the chemical composition of the matchstick changes, and new substances are formed.

**Evidence of Chemical Change:**
Several pieces of evidence indicate that burning a matchstick is a chemical change:

1. Formation of new substances: When a matchstick burns, it undergoes a combustion reaction, resulting in the formation of new substances such as carbon dioxide, water vapor, and ash.

2. Energy change: The burning of a matchstick is an exothermic reaction, meaning it releases energy in the form of heat and light. This energy release is characteristic of a chemical change.

3. Irreversibility: Once a matchstick is burned, it cannot be restored to its original form. The chemical changes that occur during combustion are irreversible.

**Explanation of the Reason:**
The reason provided in the question is correct. Chemical changes are characterized by irreversible changes in which the chemical composition of the substances involved is altered, and new substances are formed. In the case of burning a matchstick, the chemical composition of the matchstick changes, and new substances are produced, such as carbon dioxide, water vapor, and ash. Therefore, the reason correctly explains why burning a matchstick is a chemical change.
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:Assertion : Burning a match stick is a chemical change.Reason : Chemical changes are irreversible changes whereby the chemical composition also changes and a new substance is formed.a)Both (A) and (R) are true, and (R) is the correct explanation of (A).b)Both (A) and (R) are true, but (R) is not the correct explanation of (A).c)(A) is true, but (R) is false.d)(A) is false, but (R) is true.Correct answer is option 'A'. Can you explain this answer?
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:Assertion : Burning a match stick is a chemical change.Reason : Chemical changes are irreversible changes whereby the chemical composition also changes and a new substance is formed.a)Both (A) and (R) are true, and (R) is the correct explanation of (A).b)Both (A) and (R) are true, but (R) is not the correct explanation of (A).c)(A) is true, but (R) is false.d)(A) is false, but (R) is true.Correct answer is option 'A'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:Assertion : Burning a match stick is a chemical change.Reason : Chemical changes are irreversible changes whereby the chemical composition also changes and a new substance is formed.a)Both (A) and (R) are true, and (R) is the correct explanation of (A).b)Both (A) and (R) are true, but (R) is not the correct explanation of (A).c)(A) is true, but (R) is false.d)(A) is false, but (R) is true.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:Assertion : Burning a match stick is a chemical change.Reason : Chemical changes are irreversible changes whereby the chemical composition also changes and a new substance is formed.a)Both (A) and (R) are true, and (R) is the correct explanation of (A).b)Both (A) and (R) are true, but (R) is not the correct explanation of (A).c)(A) is true, but (R) is false.d)(A) is false, but (R) is true.Correct answer is option 'A'. Can you explain this answer?.
Solutions for Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:Assertion : Burning a match stick is a chemical change.Reason : Chemical changes are irreversible changes whereby the chemical composition also changes and a new substance is formed.a)Both (A) and (R) are true, and (R) is the correct explanation of (A).b)Both (A) and (R) are true, but (R) is not the correct explanation of (A).c)(A) is true, but (R) is false.d)(A) is false, but (R) is true.Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 9. Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free.
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