Journal Entry:
An engineer wants to know which of these two alcohols is
better rocket fuel. Ethanol or isopropanol. 1. What do you think “better”
means in this case?2. What measurements should you
make to determine the better choice?
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Learning Intentions
- We will learn how to define heat of reaction and heat of
combustion
- We will learn how to perform a calorimetry procedure to
determine the heat of combustion of two different alcohols.
- We will learn how to compare the heats of combustion of
different carbon-based fuels.
Closing Task:
You can collect
data to compare
the heats of combustion of different carbon-based fuels.
Content Standards being covered in this unit:
Student
can identify types of energy and explain energy changes.
Students can create a computational model to calculate the change in the energy
of one component in a system when the change in energy of the other component(s)
and energy flows in and out of the system are known (HS-PS3-1 and CCC Energy and
Matter)
Students can develop a model to illustrate that the release or absorption of
energy from a chemical reaction system depends upon the changes in total bond
energy.(HS-PS1-4 and CCC Energy and Matter) .
Students can develop and use models to illustrate that energy at the macroscopic
scale can be accounted for as a combination of energy associated with the
motions of particles (objects) and energy associated with the relative position
of particles (objects).(HS-PS3-2 and CCC Energy and Matter)
Students can plan and conduct an investigation to provide evidence that the
transfer of thermal energy when two components of different temperature are
combined within a closed system results in a more uniform energy distribution
among the components in the system (second law of thermodynamics) (HS-PS3-4 and
CCC Energy and Matter)