What is the importance of temperature change in identifying a chemical reaction?
Answer and explanation
Correct answer: It can indicate energy change
A temperature change can provide evidence that energy has been transferred during a chemical reaction. Exothermic reactions release heat and may raise the temperature, whereas endothermic reactions absorb heat and may lower it. Thus, option A is correct. Temperature change is useful evidence but is not, by itself, an absolutely exclusive test, because some physical processes can also involve heat transfer; the other options make incorrect absolute claims.
Frequently asked questions
What is the correct answer to this question?
It can indicate energy change
Why is this the correct answer?
A temperature change can provide evidence that energy has been transferred during a chemical reaction. Exothermic reactions release heat and may raise the temperature, whereas endothermic reactions absorb heat and may lower it. Thus, option A is correct. Temperature change is useful evidence but is not, by itself, an absolutely exclusive test, because some physical processes can also involve heat transfer; the other options make incorrect absolute claims.
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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