If a reaction container feels cold to the touch during a chemical reaction, what is the most appropriate conclusion?
Answer and explanation
Correct answer: Heat has been absorbed
If the outside of a reaction container feels cold, the reaction mixture is taking energy from the surroundings faster than it releases energy to them. This indicates an endothermic reaction, in which heat is absorbed. Therefore option B is the best conclusion. A released-heat process is exothermic and would generally warm the container; coldness alone cannot prove combustion or rusting.
Frequently asked questions
What is the correct answer to this question?
Heat has been absorbed
Why is this the correct answer?
If the outside of a reaction container feels cold, the reaction mixture is taking energy from the surroundings faster than it releases energy to them. This indicates an endothermic reaction, in which heat is absorbed. Therefore option B is the best conclusion. A released-heat process is exothermic and would generally warm the container; coldness alone cannot prove combustion or rusting.
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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