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Junior Cycle · Junior Cycle Science

Junior Cycle Science: Rates of reaction & gases

How often Rates of reaction & gases comes up on the Science papers, every year it was asked, and questions to try.

CL Asked on 4 of the last 6 Common Level papers, most recently in 2026. most years

Rates of reaction & gases, Common Level(8 marks)

Quick ones on Rates of reaction & gases.

(a)Why does marble powder react faster with acid than the same mass of marble chips?
  1. It has a smaller surface area
  2. It has a larger surface area
  3. It has a higher temperature
(b)Why does raising the temperature speed up a reaction?
  1. Particles stop colliding
  2. Particles get bigger and heavier
  3. Particles move faster and collide more
(c)What is the test for oxygen gas?
  1. It relights a glowing splint
  2. It makes a lit splint pop
  3. It turns limewater milky
Show the answers

(a) It has a larger surface area

(b) Particles move faster and collide more

(c) It relights a glowing splint

Your turn: Common Level questions on Rates of reaction & gases.

Common Level

Asked on 4 of the last 6 Common Level papers, most recently in 2026. most years

Every paper, year by year

YearWhere it came up
2026Q11
2025Q12
2024Q12
2023Q15
2022Not asked
2019Not asked

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

More Rates of reaction & gases questions

Rates of reaction & gases, 2 marks

What does carbon dioxide do to limewater?

  1. Turns it bright blue
  2. Turns it pink
  3. Turns it milky
Show the answer

Turns it milky

Carbon dioxide turns clear limewater milky (cloudy). In the lab it is made by reacting marble chips (calcium carbonate) with dilute hydrochloric acid.

Rates of reaction & gases, 3 marks

What does a catalyst do in a chemical reaction?

  1. Becomes the main product
  2. Speeds it up without being used up
  3. Slows the reaction and is used up
Show the answer

Speeds it up without being used up

A catalyst lowers the activation energy, so the reaction goes faster, and it is unchanged at the end. Manganese dioxide and the enzyme catalase both speed up the breakdown of hydrogen peroxide.

Other Science topics

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