Thermochemistry

If a reaction has a ΔH = - 25 J

• endothermic

• exothermic

A reaction that feels cold to the touch

• endothermic

• exothermic

2CO + O2 --> 2CO2 + 566kJ

• Exothermic reaction

• endothermic reaction

6C + 3 H₂ + 49.1 kJ → C₆H₆

• exothermic reaction

• endothermic reaction

During an exothermic reaction, heat content in the surroundings increases because

• heat energy is destroyed during reactions

• the reaction absorbs heat energy

• the energy contained in the reactants is lower then the products

• the energy contained in the products is lower than the reactants

What area of study in chemistry is concerned with the heat transfers that occur during chemical reactions?

• stoichiometry

• thermochemistry

• inorganic chemistry

• physical chemistry