3 CuCl2 (aq) + 2 Al (s) —> 2 AlCl3 + unknown solid 1. list the elements for the given reactants and the number of atoms of each. list the elements for the given product and the number of the atoms of each. based on the difference in the number of atoms between the reactants and products, predict the unknown product.

2. calculate the temperature change of the solution. did the temperature increase or decrease?

3. in an exothermic reaction, energy(as heat) flows out of the system. in a endothermic reaction, energy(as heat) flows into the system. was the reaction endothermic of exothermic? Explain your answer

4. what two things happened during the reaction that indicates a chemical reaction occurred?

5. since no gas product is indicate in the equation above, how might you explain the observation of gas bubbles?