Across
- 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
Down
- 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.