Description
There is a total of six questions all pertaining to Reaction Rates and Equilibrium. All work must be 100% original. All parts of the questions MUST be answered. Rubric is provided and must be followed. If a graph needs to be made it must be handwritten.
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Graded Assignment
Name:
SCI304B: Honors Chemistry | Unit 5 | Lesson 14: Unit Test
Date:
Graded Assignment
Unit Test, Part 2
Answer the questions below. Unless otherwise instructed, you may use a scientific calculator for this test. When
you have finished, submit this assignment to your teacher by the due date for full credit.
(5 points)
Score
1.
You watch water falling from the top of a waterfall to the bottom. Determine whether this phenomenon occurs
spontaneously. Then characterize the process of moving the water from the bottom of the waterfall to the top in
terms of whether it occurs spontaneously.
Answer:
Water falling down over the top of a waterfall is a spontaneous process because it happens naturally. Water
moves toward the lowest elevation towards a large body of water like a lake, sea or ocean. A waterfall happens
when moving water reaches a vertical (or nearly vertical) change in the earth's surface. The water simply falls to
back to the surface below and continues flowing. Since no work is being done to help this process along, it must
be spontaneous, meaning that it happens all alone.
Moving water from the bottom of the waterfall back to the top would not be spontaneous. This is not something
that would happen naturally. Physical work (as opposed to chemical work in a reaction) would have to be done to
move that water from the base of the waterfall back to the top. Gravity causes things to fall back to earth,
controlling the water to fall. Therefore gravity must be overcome to move water from the base of the waterfall
back to the top.
(8 points)
Score
2.
Hydrogen is used as a fuel for space ships. In this combustion reaction hydrogen and oxygen combine to
form water. The Gibbs energy for this reaction is negative at 773 K.
a) Define a combustion reaction. (2 points)
b) List the Gibbs energy equation and explain what it means. (3 points)
c) Determine whether this reaction is spontaneous and explain why. (3 point...