Answers and
Explanations
1) The correct answer is 4. Energy
spontaneously flows from areas of higher temperature to lower
temperature. The result might be an equilibrium, but heat does
not flow to it. Lower pressure and mass do not apply here, since
we are talking about temperature.
2) The correct answer is 4. The
Kinetic Molecular Theory outlines the properties of an ideal gas.
Both Charles's Law and Avagradro's principle describe particular
aspects of a gas under normal circumstances.
3) The correct answer is 1.
Exothermic reactions lose energy to the environment. Answers 2,
3, and 4 all refer to increases in energy in some way in the
substances involved. These are examples of endothermic
reactions.
4) The correct answer is 4. It is
the only substance that fits the definition of a compound. 1 and
2 are ions since they are showing an electric charge, and 3 is an
element.
5) The correct answer is 3. When
dealing with the same substance, the gaseous particles contain
the most energy. In descending order among the choices given, it
would be gas, liquid, and solid. If a substance had a gel phase,
it might go in between liquid and solid.
6) The correct answer is 4. The
individual gas particles inan ideal gas are defined as NOT having
any of the characteristics indicated by choices 1 through 3: They
have no volume, remain always as gasses, and are not attracted to
each other. The particles are, however, thought to be in constant
random motion.
7) The correct answer is 4. One
atmosphere of pressure is equivalent to 760 mm Hg. Dividing this
into 1140 mm Hg yields an atmospheric pressure of 1.5, choice
4.
8) The correct answer is 4. The
phrase steam-water equilibrium simply means we are at the
boiling point of water, which occurs at 100 degrees C or 373
K.
9) The correct answer is 1. At
Standard Temperature (0° C) and Pressure (1 atm), only silver, of
the four choices listed, is a solid. The definition of a solid is
that it has a definite shape and volume.
10) The correct answer is 1. If this
is a neutral atom with six electrons then it must also has six
protons. This indicates atomic number 6, which is carbon. Having
6 protons and eight neutrons makes this the isotope C-14.
Other practice
questions:
