In which example does only a change of state occur and no new substance form?
Answer and explanation
Correct answer: Water freezing into ice
The governing concept is the difference between physical and chemical change. When water freezes, its particles become arranged in a solid form, but its chemical composition remains H₂O. Thus only the state changes from liquid to solid and no new substance is produced, making option A correct. Rusting, curdling, and burning involve chemical changes that produce substances with new properties.
Frequently asked questions
What is the correct answer to this question?
Water freezing into ice
Why is this the correct answer?
The governing concept is the difference between physical and chemical change. When water freezes, its particles become arranged in a solid form, but its chemical composition remains H₂O. Thus only the state changes from liquid to solid and no new substance is produced, making option A correct. Rusting, curdling, and burning involve chemical changes that produce substances with new properties.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
