As part of our 'Space' topic, we did a science experiment. 'Planets' were made by mixing baking soda and water and adding appropriate water colours (e.g. red for Mars).
Vinegar was added to see how the 'planet' would react. We had ideas and discussions with regards to ingredients (solids, liquids, how the vinegar smelt and great language with regards to predictions and explanations regarding how the 'planet' reacted).