Energetics

What doe we call chemical reactions that release energy

Exothermic

What do we call chemical reactions that take in energy

Endothermic

Definition for enthalpy of formation

The enthalpy of formation of a compound is defined as the enthalpy change (heat energy) when one mole of the compound is formed from its elements. When all reactants and products are in their standard states under standard conditions

Example of enthalpy of formation

Basically solve the equation normally but then once its solved find out 1 mole of the product by diving everything by the coefficient of the product

Definition of enthalpy of combustion

The enthalpy change when one mole of a substance undergoes complete combustion in sufficient oxygen. When all reactants and products are in their standard states under standar conditions

Example of enthalpy of combustion

What are the standard conditions

298K (25 degrees) and 100KPa

Definition for Enthalpy of reaction

The amount of heat taken in or evolved under standard conditions when the quantities shown by an equation react completely to form a product. When all reactants and products are in their standard states under standard conditions

What are standard states

The most stable version/allotrope of themselves in standard conditions.

Equation for heat energy

q=mc △T

Equation for enthalpy of combustion

△H^oc = q-1000/moles

Equation for ethalpy of reaction

△Hr^o = - q/1000/moles