For this unit of science, we are chemists. We are currently learning about reversible and irreversible changes; this lesson was focused on irreversible changes. Irreversible means ‘when a change cannot be undone to get the same substances back again’.
In groups, the children measured the starting components – vinegar and baking powder. Next, they added them together into a bottle, with a balloon on top, to collect the gas that was created (carbon dioxide). This was an irreversible reaction. The scientific enquiry type was comparative and fair tests.
Help at home: Discuss other irreversible changes. For example, burning toast.