-
Introduction
View the activity introduction for more information on the topic
-
Read aloud
Read the question aloud
-
Accessibility
Open the accessibility toolbar to change fonts and contrast, choose a different language, use a ruler and more
Melting and freezing are reversible changes.
This means that if we undo the change, we can get back the materials we started with.
A good example of this is ice and water.
Ice melts into water, but we can turn it back into ice by putting it into the freezer, where it will freeze.
Remember that in science, material means any solid, liquid or gas that you can detect using your senses!
Non-reversible changes result in a new and different material.
A birthday cake is a good example of a new material. We mix together eggs, butter, flour and sugar, add heat and enjoy!
But... we cannot reverse the changes. 'Cake' cannot be changed back into the ingredients that we started with. We wouldn't want to anyway!
Many non-reversible changes are caused by heating.
So, let's find out about non-reversible changes.
Question
/ 10Mrs Williamson
Do you want to skip questions and finish?
Hold up, it looks like there may be an issue with your spelling. Why not try it again?
You need to check your answer before you proceed. Are you sure you want to skip?
Teacher explanation