Materials:

• 1/2 cup vinegar
• Sandwich size ziplock bag
• Bicarb soda
• A tissue

Instructions:

• This experiment can get messy so it is best performed outside or over a sink.
• Pour the vinegar into the plastic bag and zip it closed.
• Place four generous teaspoons of baking soda into the centre of an unfolded tissue.
• Raise the corners of the tissue to enclose the baking soda in a little sack.
• Unzip the ziplock bag enough to fit the baking soda packet and quickly close the bag again.
• Shake it up until it fizzes.
• When it starts to fizz, put it down on the table and wait for it to 'pop.'
• The baking powder will start to fizz, causing the bag to expand and eventually explode.