Intro to chemistry Therm o formation one elements A. The standard enthalpy (heat) of ___________, ΔH°f, is defined as the change in enthalpy that accompanies the formation of ____ mole of the compound in its standard state from its ___________ in their standard states (at 1 atm and 298K). formation one elements

Intro to chemistry Therm o one

Intro to chemistry Therm o fractional one elements ZERO 1. For comparison purposes, note that you will see ___________ coefficients to ensure only ______ mole of compound is formed. 2. The ΔH°f for ___________ (in their standard state) is always _______ kJ as they are used as the reference for the ΔH°f of compounds. fractional one elements ZERO

Intro to chemistry Therm o

Intro to chemistry Therm o one

Intro to chemistry Therm o enthalpy B. The ________ change for a chemical reaction, or amount of heat released or absorbed, can be determined by the following formula: enthalpy

Intro to chemistry Therm o subscripts specific o A. Be aware that you will encounter a variety of __________ following the ΔH, however, they are simply indicating a ________ type of reaction or change of state. 2. The naught, ___ , simply indicates standard conditions (1 atm and 0°C). subscripts specific o

Intro to chemistry Therm o profiles A. Energy ________ (or diagrams) are theoretical representations of the energy pathway as the reactants are turned into products. profiles

Intro to chemistry Therm o Activation enthalpy 1. The ________ change can be determined by comparing the energy of the products to reactants. 2. __________energy is the minimum amount of energy the reactants must possess for the reaction to proceed. enthalpy Activation

Intro to chemistry Therm o