(D) Einstein equation, E = mc^2
- A ΔHreaction of –100 kJ/mole indicates the reaction is
(A) endothermic
(B) unstable
(C) in need of a catalyst
(D) exothermic
Directions: Before attempting to answer the following questions (11–15),
you may want to review the directions for this type of question, found on the
beginning pages of this eBook.
Every question below contains two statements, I in the left-hand column and
II in the right-hand column. For each question, decide if statement I is true or
false and whether statement II is true or false, and fill in the corresponding T
or F ovals in the answer spaces. *Fill in oval CE only if statement II is a
correct explanation of statement I.
I II
11. If the heat of formation of a compound
is a large number preceded by a minus
sign, the reaction is exothermic
BECAUSE
the First Law of Thermodynamics states
that a negative heat of formation is
associated with an exothermic reaction.
12. The burning of carbon with excess O 2 to
form CO 2 will go to completion
BECAUSE
when a reaction results in the release of
a gas that is allowed to escape, the
reaction will go to completion.
13. The heat of formation of a compound
can be calculated by algebraically
adding two or more thermal reaction
equations
BECAUSE
Hess’s Law states that a heat of
reaction can be arrived at by the
algebraic summation of two or more
other thermal reactions.
14. Entropy can be described as the state of
disorder of a system
BECAUSE
when high amounts of energy are
released from a reaction, the reaction is
said to be exothermic.
15. The reaction in which HgO is heated to
BECAUSE
in a decomposition reaction, the original
compound is broken apart into equal
