Hi Rebecca,
this demonstration can make a great prompt when looking at Inquiry based learning.
Children could then consolidate their science understanding by posing simple testable questions that they can then verify with an investigation.
A child might suggest: “I think that if there is more oil then it won’t work… because…” and then check out if the more oil scenario does or doesn’t work.
Another child might think – there needs to be lots of water or the tablet won’t fizz- can I try it with only water?
In this way children act as scientists and confirm or refute their own understanding.