Science with Mrs Katrina Gale

We were very fortunate when Mrs Gale offered to demonstrate some science experiments involving dry ice.  This fitted in very nicely with our Term 3 inquiry focus on water and changes in state.  We learnt a new science word - sublimation .  This is when something changes from a solid to a gas (without transitioning through a liquid state).

Mrs Gale froze flowers in dry ice and then broke them with a hammer, she inflated balloons with dry ice and she made coins sing by pressing them onto bits of dry ice!!  

Mrs Katrina Gale demonstrates what happens when you add dry ice to an alkaline solution that has been coloured using universal indicator.  The addition of dry ice to the solution  produces a reaction where CO2 is released (see all of the bubbles).  This also makes the solution more acidic and results in the universal indicator making the solution change colour.