key terms in chapter 9

• Enthalpy Change: Heat given off or absorbed during a reaction at constant pressure.

• Exothermic: Gives off heat from system to surroundings.

• Endothermic: Absorbs heat from the surrounding to the system.

• Specific Heat Capacity: Amount of heat required to raise temperature of 1 gram of a substance by 1K/1℃.

• Heat Capacity: Amount of heat required to raise the temperature of a given quantity of substance by 1K/1℃.

• Calorimeter: Device used to measure the heat released (or absorbed) by a physical or chemical process.

• Lattice Energy: Energy change when 1 mole of solid ionic compound is formed from its’ gaseous ions.