Chapter 12 Key Terms

Question 1

thermochemistry

Answer 1

the study of the changes in heat in chemical reactions

Question 2

exothermic reaction

Answer 2

reaction that releases heat (to its surroundings)

Question 3

endothermic reaction

Answer 3

reaction that absorbs heat (from its surroundings)

Question 4

enthalpy

Answer 4

the enthalpy of a substance is its energy plus a small added term that takes into account the pressure and volume of the substance

Question 5

standard enthalpy change

Answer 5

an enthalpy change that is measured when reactants in their standard states change to products in their standard states

Question 6

calorimetry

Answer 6

the study of heat flow and heat measurement

Question 7

heat capacity

Answer 7

the amount of needed to raise the temperature of the object by 1 Celsius degree

Question 8

specific heat

Answer 8

the heat capacity of 1 gram of a substance

Question 9

kinetic theory

Answer 9

heat results from the motion and vibration of particles