Which change is the clearest indication that a chemical reaction has occurred?
Answer and explanation
Correct answer: One or more substances with new properties are formed
In a chemical reaction, the chemical composition of the reactants changes and new substances are formed. These substances have properties different from those of the original substances, so their formation is a clear indication of a chemical change. In contrast, changing only the position, shape, or container does not form a new substance; these are physical changes.
Frequently asked questions
What is the correct answer to this question?
One or more substances with new properties are formed
Why is this the correct answer?
In a chemical reaction, the chemical composition of the reactants changes and new substances are formed. These substances have properties different from those of the original substances, so their formation is a clear indication of a chemical change. In contrast, changing only the position, shape, or container does not form a 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.
