CHM1100C
General Chemistry
COMPLETED EXAM w/
RATIONALES
2024
,1. What is thermochemistry and why is it important for
nursing practice? Explain with an example.
Answer: Thermochemistry is the branch of chemistry that
studies the energy changes that accompany chemical
reactions and phase changes. It is important for nursing
practice because it helps to understand the effects of
temperature and heat on the human body, such as
metabolism, thermoregulation, fever, hypothermia, burns,
etc. For example, thermochemistry can help to calculate the
amount of heat released or absorbed by the body during a
fever or a cold exposure.
2. What is the difference between heat and temperature?
How are they measured and expressed in SI units?
Answer: Heat is a form of energy that flows from a hotter
object to a colder one. Temperature is a measure of how
hot or cold an object is. They are measured by different
instruments, such as thermometers, calorimeters, etc. They
are expressed in different SI units: heat in joules (J) and
temperature in kelvins (K).
3. What is specific heat capacity and how can it be used to
calculate the amount of heat transferred between an object
and its surroundings? Give the formula and an example.
, Answer: Specific heat capacity is the amount of heat
required to raise the temperature of one gram of a
substance by one degree Celsius. It can be used to calculate
the amount of heat transferred between an object and its
surroundings by using the formula: q = mc∆T, where q is
the heat transfer, m is the mass of the substance, c is the
specific heat capacity, and ∆T is the change in temperature.
For example, if 100 g of water at 25°C absorbs 8400 J of
heat from a hot plate, its final temperature can be
calculated as follows: q = mc∆T -> 8400 = 100 x 4.18 x
(∆T) -> ∆T = 20.1°C -> final temperature = 25 + 20.1 =
45.1°C.
4. What is latent heat and how does it differ from sensible
heat? Give examples of latent heat processes in the human
body.
Answer: Latent heat is the amount of heat required to
change the phase of a substance without changing its
temperature. Sensible heat is the amount of heat that causes
a change in temperature of a substance without changing its
phase. Examples of latent heat processes in the human
body are sweating, which involves the evaporation of water
from the skin, and condensation, which involves the
formation of water droplets on the skin or respiratory tract.
General Chemistry
COMPLETED EXAM w/
RATIONALES
2024
,1. What is thermochemistry and why is it important for
nursing practice? Explain with an example.
Answer: Thermochemistry is the branch of chemistry that
studies the energy changes that accompany chemical
reactions and phase changes. It is important for nursing
practice because it helps to understand the effects of
temperature and heat on the human body, such as
metabolism, thermoregulation, fever, hypothermia, burns,
etc. For example, thermochemistry can help to calculate the
amount of heat released or absorbed by the body during a
fever or a cold exposure.
2. What is the difference between heat and temperature?
How are they measured and expressed in SI units?
Answer: Heat is a form of energy that flows from a hotter
object to a colder one. Temperature is a measure of how
hot or cold an object is. They are measured by different
instruments, such as thermometers, calorimeters, etc. They
are expressed in different SI units: heat in joules (J) and
temperature in kelvins (K).
3. What is specific heat capacity and how can it be used to
calculate the amount of heat transferred between an object
and its surroundings? Give the formula and an example.
, Answer: Specific heat capacity is the amount of heat
required to raise the temperature of one gram of a
substance by one degree Celsius. It can be used to calculate
the amount of heat transferred between an object and its
surroundings by using the formula: q = mc∆T, where q is
the heat transfer, m is the mass of the substance, c is the
specific heat capacity, and ∆T is the change in temperature.
For example, if 100 g of water at 25°C absorbs 8400 J of
heat from a hot plate, its final temperature can be
calculated as follows: q = mc∆T -> 8400 = 100 x 4.18 x
(∆T) -> ∆T = 20.1°C -> final temperature = 25 + 20.1 =
45.1°C.
4. What is latent heat and how does it differ from sensible
heat? Give examples of latent heat processes in the human
body.
Answer: Latent heat is the amount of heat required to
change the phase of a substance without changing its
temperature. Sensible heat is the amount of heat that causes
a change in temperature of a substance without changing its
phase. Examples of latent heat processes in the human
body are sweating, which involves the evaporation of water
from the skin, and condensation, which involves the
formation of water droplets on the skin or respiratory tract.
