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Lesson: Exothermic and Endothermic Reactions

In this lesson, we will learn how to describe exothermic and endothermic reactions and examine the energy transfers involved.

Worksheet • 4 Questions

Q1:

A chemical reaction has a reaction enthalpy of +430 kJ/mol. Is it endothermic or exothermic?

  • A Exothermic
  • B Endothermic

Q2:

Which of the following is the best definition of an exothermic reaction?

  • A A reaction that gives out heat
  • B A reaction that is accelerated by heating
  • C A reaction that absorbs heat
  • D A reaction that is accelerated by cooling
  • E A reaction that is spontaneous

Q3:

A chemical reaction has a reaction enthalpy of − 5 1 2 kJ/mol. Is it endothermic or exothermic?

  • A Endothermic
  • B Exothermic

Q4:

Which of the following is the best definition of an endothermic reaction?

  • A A reaction that absorbs heat
  • B A reaction that is accelerated by heating
  • C A reaction that gives out heat
  • D A reaction that is accelerated by cooling
  • E A reaction that is spontaneous
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