1. What do you think will happen when we mix bicarbonate of soda and citric acid with warm water?

2. Circle the properties you observe during the experiment:

Bubbles Color Change Gas Formation Crystal Dissolving New Substance Formed

3. Draw and label what you observe when vinegar is added:

4. Is this a physical or chemical change? Explain why:

5. Using your senses (except taste!), describe what happened:

I saw:

I heard:

I smelled:

6. Could we get the crystal back to its original form? Why or why not?

7. What would you like to investigate next about crystals?