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CLEP Chemistry 1

Subjects : clep, science, chemistry
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The freezing point is always lowered by addition of solute.






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






3. Electronegativities ________ from left to right in a period.






4. Gases are composed of tiny - invisible molecules that are widely separated from one another in otherwise empty space.






5. The degree of randomness of a system is represented by a thermodynamic quantity called? the greater the randomness - the greater the _______.






6. In a closed system - when opposing changes are taking place at equal rates - the system is said to be in _____ _______.






7. The most active nonmetals are found in what corner of the periodic table?






8. *The hypothetical ideal gas obeys exactly the mathematical statement of the ideal gas law. This statement is also called the _____ ___ ____ of an ideal gas because it relates the variables (P - V - n - T) that specify properties of the gas.






9. This process occurs when the system is maintained at the same temperature throughout an experiment.






10. A catalyst lowers the ______ _____ _____ that must be overcome in order for the reaction to proceed. It merely speeds the approach to equilibrium but does not change Keq at all.

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11. The action of salts of weak acids or bases with water to form acidic or basic solutions.






12. _____ bonds are present in molecules containing double or triple bonds.






13. A solution in which solid solute is in equilibrium with dissolved solute.






14. Rays made up of positive electrodes in basic electron charges.






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






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






17. The freezing point - boiling point - and vapor pressure of a solution differ from those of the pure solvent by amounts which are directly proportional to the molal concentration of the solute.






18. For a solution in which a nonvolatile solute is dissolved in a solvent - the vapor pressure is due only to the vapor of the solvent above the solution. This vapor pressure is given by _______ law.

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19. *The surface area exposed affect chemical reactions because most reactions depend on the reactants coming into contact - increasing the rate of the reaction.






20. Metals have electronegativities less than ____






21. A chemical reaction formed from the union of its elements.






22. A theory of the hydrogen atom stating that the electron can exist in only certain stable energy levels and that when the electronic state of the atom changes - it must absorb or emit exactly that amound of energy equal to the difference betweent he f






23. 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






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






25. **As we proceed to the right of the table - ______-forming properties decrease and _____-forming properties increase.






26. **Proceeding across a period from left to right - the ionization energy _______.






27. The heat required to change 1mole of solid completely to vapor.






28. The force with which the electrons flow from the negative electrode to the positive electrode through an external wire is called?






29. Liquids with strong attractive forces have ______ boiling points.






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






31. In an endothermic process - energy is absorbed and ^E is _______.






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






33. In an exothermic process - energy is released and ^E of reaction is ________.






34. A process that occurs whent eh system is maintained at constant pressure.






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






36. Increasing the pressure on a system at equilibrium will cause a shift in the position of equilibrium in the direction of the fewest number of ______ of gaseous reactants or products.

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37. A law stating that at a constant temperature - the volume of a gas in inversely proportiona to the pressure.






38. The vapor pressure increases with increasing _____.






39. The energy required to remove an electron from an isolated atom in its ground state.






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






41. The ______ of the system is some particular set of conditions of pressure - temperature - number of moles of each component - and their physical form (ex: gas - liquid - solid or crystalline form).






42. 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.






43. In a closed system - when the rates of evaporation and condensation are equal - the system is in ____ ______.






44. The relatively weak attractive forces between molecules that are apparent only when the molecules approach one another closely (usually at low temperatures and high pressure).






45. Cells that convert electrical energy into chemical energy.






46. When the rate of evaporation equals the rate of condensation - the system is in __________.






47. The change in enthalpy of an exothermic reaction is ________.






48. If an inert gas is introduced into a reaction vessel containing other gases at equilibrium - it will cause an increase in the ______ _____ within the container - but the increase will not affect the position of equilibrium.

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49. When an electron moves from an excited state to the ground state - it _______ energy.






50. For most substances - when a hot concentrated solution is cooled - the excess solid ________. This is useful in purification of the solute.