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Changing Materials

Changing Materials

Author: Jamie Warren

At the end of this lesson, students will be able to:

  • determine whether a particular change is reversible or irreversible
  • correctly use the words 'reversible change' and 'irreversible change' and identify an example of each

Completed as part of the SOPHIA.ORG iPad Prepared Certification.


This lesson is not intended to be used as a stand-alone lesson, as it is intended that it would be completed along with hands-on experiences related to this topic. This lesson is intended to be used as a review/assessment lesson as it will identify students' knowledge in the topic.

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In class, we have been talking about reversible and irreversible changes. A reversible change is when something can go back to how it was before; for example putting sand in a glass of water is a reversible change because we can boil the water to take the sand out. An irreversible change is when something can't go back to how it was before; for example when we cook popcorn, once the kernals are popped they can't go back to being un-popped.

Reversible and Irreversible Changes

This link will take you to a website where you will be able to quickly explore mixing objects. This will help you to reinforce your knowledge before you take the quiz.


Once you are confident in understanding all of what we have learnt, make sure you take the practice test on the top right-hand side of this page. If you can answer 3 questions correctly, you're ready to take the quiz!

It is not a timed quiz, so you can take as long as you like, but you are not allowed to use other sources to give you the information.

Find a quiet spot where you can concentrate and when you are ready, click the link below.