Chemical reactions give off clues that can be observed with our 5 senses. These ‘clues’ help us to identify if a chemical reaction has occurred in what we are currently observing. In the videos below, all of the reactions are chemical reactions. 

INSTRUCTIONS: Watch the three reactions below and write down what you notice about them that might indicate they are chemical reactions. 

1. Iodine Clock Reaction

Watch the clip and record your observations in your notebook:

2. Rocket Engine

Watch the clip and record your observations in your notebook:

3. Elephant’s Toothpaste

Watch the clip and record your observations in your notebook.