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An endothermic reaction is one during which heat is…

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An endothermic reaction is one during which heat is ____and can be represented by the symbol____. Which of the following combinations can be used accurately to complete the above definition?

A. liberated -ΔH

B. liberated +ΔH

C. absorbed -ΔH

D. absorbed +ΔH

QUICK ANSWER…

D

DETAILS…

While exothermic reaction involves the liberation of heat from the reaction to the environment, endothermic reaction involves the absorption of heat from the environment.

Exothermic reactions are usually represented as -ΔH, while endothermic reactions are usually represented as +ΔH.

Now for the right answer to the above question:

  1. Option A is incorrect. heat is absorbed and represented by positive heat change.
  2. Option B is incorrect. heat is absorbed, and not liberated.
  3. C is incorrect. Yes, heat is absorbed, but the sign should be positive.
  4. D is the correct answer.

KEY-POINTS…

You may please note these/this:

RELATED!  In the study of physics, temperature and heat are often confused with...
  • The prefix endo means into…
  • The prefix exo means outwards…
  • Exothermic reactions are usually hot when touched, this is because they are releasing heat to the environment.
  • Endothermic reactions are usually cold when touched, this is because they absorb heat from the environment.

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/ culled from 2015 JAMB-UTME Chemistry past question 39 /

An endothermic reaction is one during which heat is... » QuizTablet
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