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Biophysics Exam 1 || with 100% Correct Answers.
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  • Biophysics

Which of the following properties are extensive (choose all that apply): a. temperature b. pressure c. amount of heat released d. density e. energy f. molarity g. number of moles h. mass i. volume correct answers amount of heat released, energy, number of moles, mass, volume T/F A pis...

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  • December 15, 2024
  • 7
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • which of the following properties are extensive c

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  • Biophysics
  • Biophysics

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Biophysics Exam 1 || with 100% Correct Answers.
Which of the following properties are extensive (choose
all that apply):
a. temperature
b. pressure
c. amount of heat released
d. density
e. energy
f. molarity
g. number of moles
h. mass
i. volume correct answers amount of heat released, energy, number of moles, mass, volume

T/F
A piston containing an ideal gas expands isothermally
from 7 atm pressure to 2 atm pressure. The energy of
the system (that is, the contents of the piston) remains
constant during this process. correct answers True

A protein is negatively charged, but it binds a negatively
charged small molecule faster than it binds a positively
charged small molecule. The most reasonable
explanation for this phenomenon is: correct answers Even though the protein is negatively
charged
overall, electrostatic focusing effects provide a
pathway for a negatively charged molecule to enter
the active site

The enthalpy change for a process is equal to the heat
transferred to the system under which of the following
conditions? correct answers constant pressure

Energy is a good indicator of the direction of
spontaneous change for macroscopic mechanical
objects but not for molecular processes correct answers True

Which of the following statements about potential
energy is true?
a. The potential energy of an ideal gas is equal to its
kinetic energy.
b. The potential energy of an atom is the work
done in moving the atom from infinity to its
present position.
c. Potential energy is always absolutely conserved.
d. The potential energy of a system always increases.

, e. Potential energy is an intensive function correct answers b. The potential energy of an atom is
the work
done in moving the atom from infinity to its
present position.

The type of function that best describes the energy of a
hydrogen bond as the distance between the hydrogen
atom and the acceptor atom varies between 1.5 and
2.5 Å, is: correct answers parabola...

. A reaction that releases energy is called an ________
reaction. correct answers Exothermic

The first law of thermodynamics states that the total
energy of the system and surroundings remains ________. correct answers constant

Electrostatic interactions are governed by __________'s
law correct answers Coulomb

An ion pair with lysine can be formed by the sidechain
of _________ or ____________. correct answers aspartic acid, glutamic acid

. The force arising from a noncovalent interaction
between two atoms is always ______ at the energy
minimum. correct answers zero

The energy for van der Waals interactions approaches
_____ as the distance between atoms goes to zero and
approaches _____ at infinite distance. correct answers infinity kcal•mol-1, 0 kcal•mol-1

It is easier to predict the bulk behavior of a small
number of molecules than a large number of molecules. correct answers False

Two sets of molecules are mixed into a system at time
zero. After 10 seconds, equilibrium has been reached. At
what time was the entropy of the system maximal?
a. 10 seconds (equilibrium)
b. 5 seconds (half the time it takes to reach
equilibrium)
c. immediately upon mixing of the two sets of
molecules
d. prior to mixing of the two sets of molecules correct answers a. 10 seconds (equilibrium)

Consider a coin with two sides (H = heads; T = tails). The
probability of observing HHHHHTTTTT is equal to the
probability of observing HTHTHTHTHT. correct answers True

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