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CLEP Chemistry 1
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CLEP Chemistry 1
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25 Questions

1. A state function in which it is the heat content of a substance.

2. The enthalpy changes associated with the reactions that correspond to the formation of a substance from its free elements are called?

3. The law stating that in any spontaneous process there is an increase in the entropy of the universe.

4. Heat added to a system and work done by a system are considered _________ quantities.

5. This law states that the entropy of any pure - perfect crystal at absolute zero is equal to zero.

6. Reactions that do not occur spontaneously can be forced to take place by supplying energy with an external current.

7. *The nature of the reactants and products affect chemical reactions because some elements and compounds have bonds that when broken/formed - react more rapidly with each other than others.

8. *The temperature affects chemical reactions with an increase of ___degrees C above room temperature - causing the reaction rate to double.

9. The freezing point is always lowered by addition of solute.

10. In a _______ expansion of a gas - the opposing pressure is virtually equal to the pressure exerted by the gas. It is ______ because any slight increase in the external pressure will reverse the process and cause compression to occure.

11. The most active metals are found in what corner of the periodic table?

12. A catalyst affects a chemical reaction by lowering the _____ _____ for both the forward and the reverse reactions equally.

13. *Each wave function corresponds to a certain electron energy and describes a region about the nucleus (orbital) where an electron having that energy may be found.

14. Deviations from Boyles law that occur with real gases represent _______ behavior.

15. The amount of heat energy required to raise the temperature of a given quantity of a substance one degree celcius.

16. For a ________ reaction - the energy liberated in the exothermic reaction equals the energy absorbed in the endothermic reaction.

17. A law stating that the vapor pressure of a solution at a particular temperature is equal to teh mole fraction of the solvent in the liquid phase multiplied by the vapor pressure of the pure solvent at the same temperature.

18. The solubility of gases in liquid or solid solvents always increases with ________ pressure.

19. The molecules in a gas are in constant - continueous - random - and straight-line motion.

20. The maximum work derived from any change will be obtained only if the process is carried out in a reversible manner. All real - spontaneous changes are therefore not reversible - and the work that can be derived from an irreversible change is alway l

21. The vapor pressure of an aqueous solution is always lowered by the additon of more solute - which causes the boiling point to be raised.

22. In titration - this is the point at which a particular indicator changes color.

23. In titration - this point occurs when equal numbers of equivalents of acid and base have been reacted. The solution at this point is neutral because neither of the ions of the salt in solution undergoes hydrolysis.

24. A chemical reaction where one substance is displacing another. ex: Fe + CuSo4 -> FeSo4 + Cu.

25. The law stating that change in internal energy is equal to the difference between the energy supplied toi the system as heat and the energy removed from the system as work performed on the surroundings.

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