Chemistry 12

Thermochemistry

100

What are the 2 types of Fundamental energy

What is Kinetic Energy and Potential Energy.

200

What is Enthalpy and Enthalpy Change?

What is Enthalpy: The total kinetic and potential energy of a system. (H) Enthalpy Change: When the amount of energy that is absorbed or released changes (delta H)

300

How does energy change when enthalpy changes happen?

What is -In an exothermic reaction, energy is released to the surroundings, this causes the kinetic energy to increase and as a result the temperature of the surroundings goes up. In the meantime the potential energy goes down. -In an endothermic reaction, the opposite happens.

400

Given 132.8J of energy is required to heat 11.17g of aluminum from 15.73 degrees celsius to 28.94 degrees celsuis, find the specific heat of aluminum.

What is q= mcTf-Ti 132.8J= (11.17g)(c)(28.94-15.73) c= 132.8 ________ c= 0.89 J/gC (11.17)(13.21)

500

Calculate the Delta Hr for the combustion of Methane. CH4(g) + 2O2(g) --> CO2(g) + 2H2O(l) -74.6KJ/mol 0 -393.5KJ/mol -285.8KJ/mol

What is Delta Hr=[(1molCo2)(-393.5KJ/mol)+(2molH2O)(-285.8KJ/mol)] - [(1molCH4)(-74.6KJ/mol)+(2molO2)(0KJ/mol)] Delta Hr= (-965.1)-(-74.6KJ) Delta Hr= -890.5KJ