Unit 10 Thermochemistry vocabulary

Exothermic

• the heat content of a system at constant pressure (heat and/or light.) "Will feel hot."

• a chemical reaction which requires or absorbs energy (heat and/or light from its surrounds. "Will feel cold".

• the minimum energy required to activate or start a chemical reaction.

Endothermic Reaction

• the heat content of a system at constant pressure (heat and/or light.) "Will feel hot."

• the temperature and pressure where all three phases coexist. 

• a chemical reaction that requires or absorbs energy (heat and/or light from its surroundings. "Will feel cold".

•  is the amount of heat energy required to raise the temperature of one gram of that substance.

Potential Energy

• change of state

• stored energy 

• change in bond strength and molecular stability 

• energy of movement 

Calorie

•  the common unit of heat 

• change in bond strength and molecular stability

•  increasing in the temperature 

• the temperature and pressure where all three phases coexist. 

Kinetic Energy

• the number of particles (moles) of gas 

• the common unit of heat 

• stored energy 

• energy of movement

Triple point 

• is the amount of heat energy required to raise the temperature of one gram of that substance.

•  the average kinetic energy of the moving molecules of a substance. It is measured in ℃

• the temperature and pressure where all three phases coexist. 

• is the measure of internal energy of the moving molecules found in all matter.

Specific Heat Capacity

•  the average kinetic energy of the moving molecules of a substance. It is measured in ℃

•  is how a chemist determines if a reaction is spontaneous or nonspontaneous 

• the amount of heat needed to melt/freeze

• is the amount of heat energy required to raise the temperature of one gram of that substance.

Temperature

• the heat content of a system at constant pressure (heat and/or light.) "Will feel hot."

• the average kinetic energy of the moving molecules of a substance. It is measured in ℃

• the amount of disorder in a system

•  the minimum energy to activate or start a chemical reaction

Heat

• the amount of heat needed to melt/freeze

• change in bond strength and molecular stability 

•  is the amount of heat energy required to raise the temperature of one gram of that substance.

•  is the measure of internal energy of the moving molecules found in all matter.

Law of Conservation of Energy

• energy of movement 

• stored energy 

• the temperature and pressure where all three phases coexist. 

•  the total energy of an isolated system remains constant