What is the most reliable indication that a chemical reaction has occurred?
Answer and explanation
Correct answer: Formation of new substances with properties different from those of the reactants
In a chemical reaction, reactants are converted into new substances with properties different from those of the reactants. Therefore, the formation of new substances with new properties is the most reliable indication of a chemical reaction. In contrast, changing position, shape, or container usually forms no new substance; these are physical changes.
Frequently asked questions
What is the correct answer to this question?
Formation of new substances with properties different from those of the reactants
Why is this the correct answer?
In a chemical reaction, reactants are converted into new substances with properties different from those of the reactants. Therefore, the formation of new substances with new properties is the most reliable indication of a chemical reaction. In contrast, changing position, shape, or container usually forms no new substance; these are physical changes.
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.
