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What is common among the following phenomena?
1. A slice of apple, if kept in the open, develops a brown colour.
2. Burning of magnesium ribbon.
3. A new substance is formed during this change.
1. A slice of apple, if kept in the open, develops a brown colour.
2. Burning of magnesium ribbon.
3. A new substance is formed during this change.
- a)All are examples of periodic changes
- b)All are examples of undesirable changes
- c)All are examples of chemical changes
- d)All are examples of irreversible changes
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
What is common among the following phenomena?1. A slice of apple, if k...
Explanation:
The correct answer is option 'C', which states that all the given phenomena are examples of chemical changes. Let's understand why.
1. A slice of apple, if kept in the open, develops a brown colour:
When an apple slice is exposed to air, it undergoes a chemical change called oxidation. The oxygen in the air reacts with the enzymes present in the apple, causing a chemical reaction that results in the brown coloration. This change is irreversible and a new substance is formed.
2. Burning of magnesium ribbon:
The burning of magnesium ribbon is a chemical change. When magnesium reacts with oxygen in the air, it undergoes combustion, resulting in the formation of magnesium oxide. This reaction is highly exothermic, releasing a large amount of heat and light. The magnesium ribbon disappears, and a new substance, magnesium oxide, is formed.
3. A new substance is formed during this change:
In both the examples mentioned above, a new substance is formed. In the case of the apple slice, the brown coloration is due to the formation of a new compound called melanin. In the case of burning magnesium, magnesium oxide is formed as a result of the reaction between magnesium and oxygen.
Therefore, all the given phenomena involve chemical changes. In a chemical change, the composition of substances changes, and new substances with different properties are formed. These changes are usually irreversible, meaning it is difficult or impossible to reverse the process and obtain the original substances back.
In summary:
- Option 'A' (All are examples of periodic changes) is incorrect because periodic changes refer to changes that occur regularly or repeatedly, such as the change of seasons, and it is not applicable to the given phenomena.
- Option 'B' (All are examples of undesirable changes) is incorrect because the desirability or undesirability of a change is subjective and not relevant to the classification of the changes as chemical or physical.
- Option 'C' (All are examples of chemical changes) is correct because all the given phenomena involve chemical reactions, resulting in the formation of new substances.
- Option 'D' (All are examples of irreversible changes) is partially correct because chemical changes are usually irreversible, but it does not encompass the complete explanation as it does not mention the formation of new substances during the change.
The correct answer is option 'C', which states that all the given phenomena are examples of chemical changes. Let's understand why.
1. A slice of apple, if kept in the open, develops a brown colour:
When an apple slice is exposed to air, it undergoes a chemical change called oxidation. The oxygen in the air reacts with the enzymes present in the apple, causing a chemical reaction that results in the brown coloration. This change is irreversible and a new substance is formed.
2. Burning of magnesium ribbon:
The burning of magnesium ribbon is a chemical change. When magnesium reacts with oxygen in the air, it undergoes combustion, resulting in the formation of magnesium oxide. This reaction is highly exothermic, releasing a large amount of heat and light. The magnesium ribbon disappears, and a new substance, magnesium oxide, is formed.
3. A new substance is formed during this change:
In both the examples mentioned above, a new substance is formed. In the case of the apple slice, the brown coloration is due to the formation of a new compound called melanin. In the case of burning magnesium, magnesium oxide is formed as a result of the reaction between magnesium and oxygen.
Therefore, all the given phenomena involve chemical changes. In a chemical change, the composition of substances changes, and new substances with different properties are formed. These changes are usually irreversible, meaning it is difficult or impossible to reverse the process and obtain the original substances back.
In summary:
- Option 'A' (All are examples of periodic changes) is incorrect because periodic changes refer to changes that occur regularly or repeatedly, such as the change of seasons, and it is not applicable to the given phenomena.
- Option 'B' (All are examples of undesirable changes) is incorrect because the desirability or undesirability of a change is subjective and not relevant to the classification of the changes as chemical or physical.
- Option 'C' (All are examples of chemical changes) is correct because all the given phenomena involve chemical reactions, resulting in the formation of new substances.
- Option 'D' (All are examples of irreversible changes) is partially correct because chemical changes are usually irreversible, but it does not encompass the complete explanation as it does not mention the formation of new substances during the change.
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Community Answer
What is common among the following phenomena?1. A slice of apple, if k...
The commonality among the given phenomena:
1. Apple turning brown: When a slice of apple is exposed to air, it gradually turns brown. This is due to a chemical reaction called oxidation. The enzymes present in the apple react with oxygen in the air, resulting in the formation of brown pigments known as melanins.
2. Burning of magnesium ribbon: When a magnesium ribbon is ignited, it undergoes a chemical reaction with oxygen in the air. This reaction is highly exothermic, producing a bright white light and a white powdery residue known as magnesium oxide.
3. Formation of a new substance: In both the apple turning brown and the burning of magnesium ribbon, a new substance is formed. In the case of the apple, the oxidation reaction leads to the formation of melanins. In the case of the burning magnesium ribbon, magnesium reacts with oxygen to form magnesium oxide.
Explanation:
The commonality among all the given phenomena is that they are examples of chemical changes. Chemical changes involve the formation of new substances with different properties from the original substances.
1. Apple turning brown: The browning of an apple slice occurs due to a chemical reaction between the enzymes in the apple and oxygen in the air. This reaction leads to the formation of brown pigments, resulting in the change of color.
2. Burning of magnesium ribbon: When a magnesium ribbon is burned, it reacts with oxygen in the air to form magnesium oxide. This reaction is highly exothermic and produces a bright white light. The formation of magnesium oxide is a chemical change as a new substance with different properties is formed.
3. Formation of a new substance: Both the apple turning brown and the burning of magnesium ribbon involve the formation of a new substance. In the case of the apple, the formation of melanins leads to the brown color. In the case of the burning magnesium ribbon, the formation of magnesium oxide is the new substance formed.
Conclusion:
In conclusion, all the given phenomena - the browning of an apple slice, the burning of magnesium ribbon, and the formation of a new substance - are examples of chemical changes. Chemical changes involve the formation of new substances with different properties from the original substances.
1. Apple turning brown: When a slice of apple is exposed to air, it gradually turns brown. This is due to a chemical reaction called oxidation. The enzymes present in the apple react with oxygen in the air, resulting in the formation of brown pigments known as melanins.
2. Burning of magnesium ribbon: When a magnesium ribbon is ignited, it undergoes a chemical reaction with oxygen in the air. This reaction is highly exothermic, producing a bright white light and a white powdery residue known as magnesium oxide.
3. Formation of a new substance: In both the apple turning brown and the burning of magnesium ribbon, a new substance is formed. In the case of the apple, the oxidation reaction leads to the formation of melanins. In the case of the burning magnesium ribbon, magnesium reacts with oxygen to form magnesium oxide.
Explanation:
The commonality among all the given phenomena is that they are examples of chemical changes. Chemical changes involve the formation of new substances with different properties from the original substances.
1. Apple turning brown: The browning of an apple slice occurs due to a chemical reaction between the enzymes in the apple and oxygen in the air. This reaction leads to the formation of brown pigments, resulting in the change of color.
2. Burning of magnesium ribbon: When a magnesium ribbon is burned, it reacts with oxygen in the air to form magnesium oxide. This reaction is highly exothermic and produces a bright white light. The formation of magnesium oxide is a chemical change as a new substance with different properties is formed.
3. Formation of a new substance: Both the apple turning brown and the burning of magnesium ribbon involve the formation of a new substance. In the case of the apple, the formation of melanins leads to the brown color. In the case of the burning magnesium ribbon, the formation of magnesium oxide is the new substance formed.
Conclusion:
In conclusion, all the given phenomena - the browning of an apple slice, the burning of magnesium ribbon, and the formation of a new substance - are examples of chemical changes. Chemical changes involve the formation of new substances with different properties from the original substances.
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What is common among the following phenomena?1. A slice of apple, if kept in the open, develops a brown colour.2. Burning of magnesium ribbon.3. A new substance is formed during this change.a)All are examples of periodic changesb)All are examples of undesirable changesc)All are examples of chemical changesd)All are examples of irreversible changesCorrect answer is option 'C'. Can you explain this answer?
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What is common among the following phenomena?1. A slice of apple, if kept in the open, develops a brown colour.2. Burning of magnesium ribbon.3. A new substance is formed during this change.a)All are examples of periodic changesb)All are examples of undesirable changesc)All are examples of chemical changesd)All are examples of irreversible changesCorrect answer is option 'C'. Can you explain this answer? for Class 6 2024 is part of Class 6 preparation. The Question and answers have been prepared according to the Class 6 exam syllabus. Information about What is common among the following phenomena?1. A slice of apple, if kept in the open, develops a brown colour.2. Burning of magnesium ribbon.3. A new substance is formed during this change.a)All are examples of periodic changesb)All are examples of undesirable changesc)All are examples of chemical changesd)All are examples of irreversible changesCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 6 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is common among the following phenomena?1. A slice of apple, if kept in the open, develops a brown colour.2. Burning of magnesium ribbon.3. A new substance is formed during this change.a)All are examples of periodic changesb)All are examples of undesirable changesc)All are examples of chemical changesd)All are examples of irreversible changesCorrect answer is option 'C'. Can you explain this answer?.
What is common among the following phenomena?1. A slice of apple, if kept in the open, develops a brown colour.2. Burning of magnesium ribbon.3. A new substance is formed during this change.a)All are examples of periodic changesb)All are examples of undesirable changesc)All are examples of chemical changesd)All are examples of irreversible changesCorrect answer is option 'C'. Can you explain this answer? for Class 6 2024 is part of Class 6 preparation. The Question and answers have been prepared according to the Class 6 exam syllabus. Information about What is common among the following phenomena?1. A slice of apple, if kept in the open, develops a brown colour.2. Burning of magnesium ribbon.3. A new substance is formed during this change.a)All are examples of periodic changesb)All are examples of undesirable changesc)All are examples of chemical changesd)All are examples of irreversible changesCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 6 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is common among the following phenomena?1. A slice of apple, if kept in the open, develops a brown colour.2. Burning of magnesium ribbon.3. A new substance is formed during this change.a)All are examples of periodic changesb)All are examples of undesirable changesc)All are examples of chemical changesd)All are examples of irreversible changesCorrect answer is option 'C'. Can you explain this answer?.
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