MOD 9 VOCAB

1. the heat energy given out when one mole of a substance burns completely in oxygen.
2. the energy stored in the chemical bonds of a substance
4. a branch of chemistry that qualitatively and quantitatively describes the energy changes that occur during chemical reactions
5. the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree
7. a system whose reactants, products, or both are in more than one phase
11. A change in one of the variables that describe a system at equilibrium produces a shift in the position of the equilibrium that counteracts the effect of this change
14. the amount of energy needed to warm 1 g of H2O by 1°C
15. energy cannot be created nor destroyed
16. power derived from the utilization of physical or chemical resources
17. everything around the reaction
20. a reaction in which the conversion of reactants to products and the conversion of products to reactants occur simultaneously.
21. the amount of energy needed to change one mole of a substance from the solid phase to the liquid phase at constant temperature and pressure

1. the value of its reaction quotient at chemical equilibrium
3. thermal energy
6. one in which all species are present in the same phase
8. the amount of energy (enthalpy) that must be added to a liquid substance to transform a quantity of that substance into a gas.
9. a device used to measure the heat flow of a chemical reaction or physical change
10. an energy-like property or state function
12. an ion that is already contained in the solution
13. unit of work or energy in the International System of Units (SI); it is equal to the work done by a force of one newton acting through one metre
18. a collection of objects (or smaller systems) that can be identified
19. condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.