Today in class we watched Naje introduce a teaspoon of some powdery white substance into a 500ml beaker filled with 100ml of clear liquid. In an instant the concoction erupted, nearly spilling outside of the beaker before swiftly subsiding and coming to a rest! Craziness! What did we witness?
Naje soon informed us that he had just combined baking soda with vinegar. We were tasked with explaining what we had just witnessed in the scientific terms we've been using this year. We had to make observations, predictions and draw conclusions supported by evidence. What most of us agreed upon was that we had witnessed a chemical reaction...and that's when the homework came.
Monday Homework:
We were told that the substances involved were these strange looking things:
CH3COOH and NaHCO3.
One of them is baking soda. One of them is vinegar. Which is which? How do you know? What evidence do you have to support your claim? What did you see today that supports this? What prior knowledge do you have to give you clues? (1/2 page response).
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