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KS2 Science at Home: Week 5

An experiment for you to try at home...

Key Stage 2 Experiment of the Week! – Sizzlin’ Snowball

How does it work?

Acids and Bases can erupt in your faces! Acid (Vinegar) + Base (Baking Soda) = Carbon Dioxide – this is the sizzlin’ you’ll hear, and bubbles you’ll see.
Click here to watch the experiment.


Materials you need

  • 1/3 cup baking soda per snowball
  • 1 1/2 tablespoons vinegar per snowball
  • Pipette


  1. Add baking soda to water until the baking soda becomes packable dough, not runny or watery.
  1. Shape into a ball.
  1. Freeze experiment
  1. Use pipette and vinegar to put drops or squirts of vinegar onto your snowballs.

5. Watch them sizzle as if it is spring!

Questions to think about

  1. Try adding blue food colouring to the vinegar. Does this change the experiment physically or chemically?
  2. Try warming up the vinegar before you squirt it onto the snowballs. Is the reaction different? Why?
  3. Reverse some of the steps. Instead of making the snowballs out of baking soda, freeze vinegar and then pour baking soda on top. Does this make the reaction better, worse, or the same?
  4. Try to make your Sizzlin’ Snowballs into a Sizzlin’ Snowperson. Stack three snowballs on top of each other, then add buttons and black beads for the eyes. Add orange foam for the nose. Top it off by adding red and green glitter to the baking soda mix to add a pop of holiday colour.

Some research for next week: Is carbon dioxide more or less dense than air?

We will answer this question with next week’s science experiment!