Class 6 Exam > Class 6 Questions > In a chemical change:a)The molecules of the s...
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In a chemical change:
- a)The molecules of the substance do not change
- b)The molecules of the substance change
- c)The substance remains same
- d)Change is reversible
Correct answer is option 'B'. Can you explain this answer?
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In a chemical change:a)The molecules of the substance do not changeb)T...
In a chemical change, the molecules in the reactants interact to form new substances. In a physical change, like a state change or dissolving, no new substance is formed. Explain that another way to say that no atoms are created or destroyed in a chemical reaction is to say, “Mass is conserved.”
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In a chemical change:a)The molecules of the substance do not changeb)T...
Understanding Chemical Changes
Chemical changes are fundamental processes in which substances undergo transformations at the molecular level. This involves the rearrangement of atoms and the breaking and forming of chemical bonds. Let’s explore why option 'B' is correct.
Molecular Transformation
- During a chemical change, the original molecules of a substance are altered.
- New substances are formed due to the reorganization of atoms. For example, when hydrogen gas reacts with oxygen gas, water molecules are produced.
Comparison with Physical Changes
- In physical changes, the molecules remain the same; they simply change in form, state, or appearance (like ice melting into water).
- In contrast, chemical changes result in new chemical compounds with different properties.
Examples of Chemical Changes
- Burning: When wood burns, it transforms into ash, smoke, and gases, illustrating a chemical change.
- Rusting: When iron rusts, it reacts with oxygen to form iron oxide, a completely new substance.
Irreversibility
- Many chemical changes are not easily reversible, unlike physical changes. For instance, once an egg is cooked, it cannot be uncooked.
Conclusion
In summary, option 'B' accurately reflects that in a chemical change, the molecules of the substance indeed change, leading to the formation of new substances with distinct properties. Understanding these transformations is crucial in the study of chemistry and its applications in everyday life.
Chemical changes are fundamental processes in which substances undergo transformations at the molecular level. This involves the rearrangement of atoms and the breaking and forming of chemical bonds. Let’s explore why option 'B' is correct.
Molecular Transformation
- During a chemical change, the original molecules of a substance are altered.
- New substances are formed due to the reorganization of atoms. For example, when hydrogen gas reacts with oxygen gas, water molecules are produced.
Comparison with Physical Changes
- In physical changes, the molecules remain the same; they simply change in form, state, or appearance (like ice melting into water).
- In contrast, chemical changes result in new chemical compounds with different properties.
Examples of Chemical Changes
- Burning: When wood burns, it transforms into ash, smoke, and gases, illustrating a chemical change.
- Rusting: When iron rusts, it reacts with oxygen to form iron oxide, a completely new substance.
Irreversibility
- Many chemical changes are not easily reversible, unlike physical changes. For instance, once an egg is cooked, it cannot be uncooked.
Conclusion
In summary, option 'B' accurately reflects that in a chemical change, the molecules of the substance indeed change, leading to the formation of new substances with distinct properties. Understanding these transformations is crucial in the study of chemistry and its applications in everyday life.
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In a chemical change:a)The molecules of the substance do not changeb)The molecules of the substance changec)The substance remains samed)Change is reversibleCorrect answer is option 'B'. Can you explain this answer?
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