1: What is the formula that relates the temperature change obsereved in a substance with the energy released or abosrbed?

2: when you measure a temperature rise during a chemical reaction, is the reaction endothermic or exothermic?

3: The enthalpy of the reaction for the reaction of calcium oxide with hydrochloric acid is exothermic. Will the reverse reaction have a positive or negative delta H?

4: Hess's law allows us to combine reactions to determine the heat of reaction for a net reaction that has not been measured. For the reactions described in the lab, the second reaction is difficult to measure as written. You will measure the heat of reaction for the reverse reaction. How will you use the measurment in the Hess's law calculations?

5: In part A of this lab you are reacting approximately 0.5g of Mg. In part B, you are directed to use a molar equivalent of MgO for the reaction. What is the molar equivalent of MgO when comparing to 0.5g Mg? Can you think of any reasons why this might be important?