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

Fill in the Blank

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

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​Systems vs.
Surroundings

Fill in the Blank

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

Fill in the Blank

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

Fill in the Blank

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.

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​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)

Fill in the Blank

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

Fill in the Blank

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