Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Textbook Question
Chapter 1, Problem 90E
During a very cold winter, the temperature may remain below freezing for extended periods. However, fallen snow can still disappear, even though it cannot melt. This is possible because a solid can vaporize directly, without passing through the liquid state. Is this process (sublimation) a physical or a chemical change?
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Diagram 1
Diagram 2
Diagram 3
Diagram 4
The diagrams above represent physical changes for potassium. Which of the following correctly identifies the physical process and provides the correct AS' for the process in the indicated diagram?
A
In diagram 1, the process is freezing and AS freezing is negative.
In diagram 2, the process is melting and AS melting is negative.
In diagram 3, the process is boiling and AS boiling is negative.
D
In diagram 4, the process is condensation and AS condensation is positive.
Q Search or enter website name
Think about what you already know about different
phases of matter. Given this figure showing the
process of changing from one phase to another, what
parameter (physical quantity of a system) serves as an
indicator for energy flowing into or out of the
molecular system?
Gas
Cool or
compress
Heat or
reduce
pressure
Liquid
Cool
Heat
Crystalline solid
In the box below, make a claim as to which parameter
is represented in the processes in the figure and use
your ideas of energy to support your claim.
Consider the following separations of materials. State whether a physical process or a chemical reaction is involved in each separation.
I. Sodium chloride is obtained from seawater by evaporation of the water.
II. Mercury is obtained by heating the substance mercury (II) oxide; oxygen is also obtained.
III. Pure water is obtained from ocean water by evaporating the water, then condensing it.
IV. Iron is produced from an iron ore that contains the substance iron (III) oxide.
V. Gold is obtained from river sand by panning (allowing the heavy metal to settle in flowing water).
Chapter 1 Solutions
Chemistry
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