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Junior Cycle · Junior Cycle Science

Junior Cycle Science: Exothermic & endothermic

How often Exothermic & endothermic comes up on the Science papers, every year it was asked, and questions to try.

CL Asked on 5 of the last 6 Common Level papers, most recently in 2026. most years

Exothermic & endothermic, Common Level(7 marks)

Quick ones on Exothermic & endothermic.

(a)What is an exothermic reaction?
  1. One that takes in heat
  2. One that gives out heat
  3. One with no energy change
(b)Which of these is an endothermic process?
  1. Respiration
  2. Burning natural gas
  3. Photosynthesis
(c)What is activation energy?
  1. Energy needed to start a reaction
  2. Energy stored in the final products
  3. Energy given out at the very end
Show the answers

(a) One that gives out heat

(b) Photosynthesis

(c) Energy needed to start a reaction

Your turn: Common Level questions on Exothermic & endothermic.

Common Level

Asked on 5 of the last 6 Common Level papers, most recently in 2026. most years

Every paper, year by year

YearWhere it came up
2026Q11
2025Q10
2024Q16
2023Q3
2022Not asked
2019Q6

Links open the State Examinations Commission’s paper for that year.

More Exothermic & endothermic questions

Exothermic & endothermic, 3 marks

In an energy profile diagram for an exothermic reaction, where are the products?

  1. Higher than the reactants
  2. At the same level
  3. Lower than the reactants
Show the answer

Lower than the reactants

In an exothermic reaction energy is released to the surroundings, so the products end up with less energy than the reactants and are drawn lower on the diagram.

Exothermic & endothermic, 3 marks

During a reaction in a beaker the thermometer reading falls. What type of reaction is it?

  1. Combustion reaction
  2. Endothermic
  3. Exothermic
Show the answer

Endothermic

An endothermic reaction takes in heat energy from its surroundings, including the water and the thermometer, so the temperature drops. Exothermic reactions make it rise.

Other Science topics

All of Junior Cycle Science