DE_Chem_1.2_Thermochemistry

Thermochemistry

​Thermochemistry

the study of the heat energy which is associated with chemical reactions and/or phase changes

Multiple Select

Which exemplifies an exothermic reaction?

Exothermy vs. Endothermy

Absorb energy

​Endothermic Rxn's

Release energy

​Exothermic Rxn's

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The Law of

states that matter and energy cannot be created or destroyed; it can be transformed into other forms.

Multiple Choice

The Law of Conservation of Energy is also known as the First Law of Thermodynamics

• True

• False

Systems are the things being studied

Everything outside the system is the surrounding

​

​Systems vs.
Surroundings

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In an

system, there is no transfer or mass or energy across the boundaries of the systems.

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In a

system, energy is exchanged with its surrounding, but there is no transfer of mass.

Fill in the Blanks

In an

system, both mass and energy are exchanged with its surrounding.

Measure (abbreviated "S") of the amount of energy in a physical system that is not available to do work.

​

​Entropy

Multiple Choice

This demonstrates ....

• high entropy

• low entropy

Match

Match the following

• currents in air, water, or other fluids carry thermal energy from one place to another

• energy travels in the form of visible or invisible light (wavelengths on the electromagnet spectrum)

• heat transfer occurs between a higher-temperature object and a lower-temperature object that are in contact.

convection

radiation

conduction

• convection

• radiation

• conduction

​Calorimetry

the technique of measuring the energy gained or lost during a chemical reaction or physical change

​q=cmΔT

the technique of measuring the energy gained or lost during a chemical reaction or physical change

Calorimetry

Draw

The equation that relates the heat that a substance absorbs or releases to its specific heat, mass, and temperature change

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​Phase Change Diagrams

​a combination of temperature and pressure beyond which a liquid cannot boil

​Below the critical point, it is possible to condense a gas into a liquid by increasing the pressure. Above the critical point, it is impossible to condense the gas by increasing the pressure.

​Critical Point (C)

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The point where a substance can exist in all three forms is referred to as the

point.

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a combination of temperature and pressure beyond which a liquid cannot boil is known as the

point.