Chapter 12 Review

1.    The heat change in a reaction is equal to the enthalpy in a reaction when what standard conditions are met?

2.    What do the following symbols mean?

    a.    H

    b.    T

    c.    C

    d.    q

   e.    M

3.    How is the standard enthalpy of an element determined?

4.    What are the three major things that Hess said about the determination of enthalpy?



5.    What is happening to the reactants in a chemical reaction that makes it exothermic?

6.    What is happening to the reactants in a chemical reaction that makes it endothermic?

7.    Define

    a.    thermochemistry

    b.    specific heat

    c.    heat capacity

    d.    calorimeter

    e.    endothermic

    f.    exothermic

8.    What is heat and what is its standard unit?

9.    In endothermic and exothermic reactions where do you put the heat gained or lost in the reaction?

10.    How is the sign (+/-) of enthalpy determined?

11.    How is the calorie related to the specific heat of water?

12.    How is the formula for heat capacity written? How does the sign of the heat capacity relate to the enthalpy?

13.    What was caloric originally thought to be?

14.    What are the 3 basic types of calories in your diet?  Give an example of each.

15.    Draw an enthalpy diagram for both an endo and exothermic reaction.  (Be able to interpret the results.

See section 12.2 for an example)

16.    Problems on pg 408 - 409

    34.                                                                        35.                                                            37.




    43.                                                                        44.                                                            51.