![Test tubes with colourful liquids](/sites/default/files/styles/resource_card_image_360x300_/public/2021-11/test-tube-with-colourful_liquids.jpg?itok=MEo5D0U_)
Evidence of Chemical Change
Backgrounders
Learn how to tell if a chemical reaction has taken place.
![Electroplating equipment](/sites/default/files/styles/resource_card_image_360x300_/public/2021-11/electroplating-equipment.jpg?itok=jJASnDjb)
Chemical Reactions: Conditions & Speeds
Backgrounders
Learn about the special conditions that let some chemical reactions take place.
![What is an exothermic reaction?](/sites/default/files/2019-08/what-is-an-exothermic-reaction.jpg)
What is an exothermic reaction?
Hands-on Activities
Things are heating up! Explore the temperature change that occurs in an exothermic reaction and the role of catalysts is this chemistry activity.
![A person’s hand holding a cold pack on an ankle](/sites/default/files/styles/resource_card_image_360x300_/public/2020-06/person_holding_ice_pack.jpg?itok=01sj50jv)
The Cold Pack: A Chilly Example of an Endothermic Reaction
STEM Explained
When you hurt your ankle, thermodynamics can help you heal! An endothermic reaction reduces the swelling by cooling your injury.
![illustration of a hydrogen car](/sites/default/files/styles/resource_card_image_360x300_/public/2019-10/Hydrogen_car.png?itok=-Ul7H9-e)
The History and Uses of Hydrogen
STEM Explained
Hydrogen’s tendency towards combustion is what makes it both a dangerous chemical element and a useful energy source.