1. Is the Elephant's Toothpaste activity exothermic or endothermic?How do you know?

		Exothermic,because the temperature increases
		Endothermic,because the temperature decreases
		Exothermic,because the temperature decreases
		Endothermic,because the temperature increases

2. A student is asked to write a balanced equation for the formation of water. He writes it as:

H₂+ O₂=> H₂O₂ Is he correct? Explain why or why not.

3. Consider the iodine clock reaction.Identify the independent and dependent variables.What is the relationship between these variables?

4. In the Elephant's Toothpaste demonstration by Mark Rober and Science Bob, what catalyst did they use? What does a catalyst do?