What can a colour change indicate in a chemical reaction?
Answer and explanation
Correct answer: Formation of a new substance
A colour change in a chemical reaction can indicate the formation of a new substance because the products may have properties different from those of the reactants. A change only in shape, state, or position does not usually form a new substance; these can be physical changes. Exam tip: Colour change, gas evolution, temperature change, and precipitate formation are common signs of a chemical reaction.
Frequently asked questions
What is the correct answer to this question?
Formation of a new substance
Why is this the correct answer?
A colour change in a chemical reaction can indicate the formation of a new substance because the products may have properties different from those of the reactants. A change only in shape, state, or position does not usually form a new substance; these can be physical changes. Exam tip: Colour change, gas evolution, temperature change, and precipitate formation are common signs of a chemical reaction.
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.
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