THERMOCHEMISTRY
Unit 12.1
Chapter 11 Section 1
Pg. 384-391
THERMOCHEMISTRY
• Thermochemistry – the study of heat
changes in a chemical reaction.
• Exothermic –
• Endothermic -
WHAT IS HEAT?
• Heat - energy transfer
between matter
• Measured in Joules
(J) or calories (cal)
• Measure heat of
reaction with a
calorimeter
• Fancy
Bomb
calorimeter
• Los Al
Styrofoam
cup and
thermometer
WHAT ABOUT
TEMPERATURE?
• Temperature – measure
of kinetic energy
• Measured in Kelvin (K)
• Energy – ability to do
work
• For chemistry
kinetic energy = ability
of molecule/atom to
move about
ENTHALPY
• Heat energy can be
shown in a reaction as
ΔH, or enthalpy.
• Enthalpy – total change
in the heat energy of a
system.
• Exothermic – ΔH
• Endothermic - ΔH
COLLOQUIAL VS.
• Today’s Activity: For the following
SCIENTIST
words, write their definitions from the
perspectives of a student and
chemist. Example:
• Student: “We mixed baking soda
in water and calcium chloride in
water, it felt a little cool, the liquid
turned a cloudy white color.”
• Chemist: “The combination of
aqueous baking soda and
calcium chloride is an
endothermic reaction with the
products of aqueous sodium
chloride and solid calcium
carbonate.”
STUDENT VS. SCIENTIST
VOCAB CHART
Vocab Term
Thermochemistry
Exothermic
Endothermic
Heat
Temperature
Energy
Enthalpy
Student Definition
Scientist Definition