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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 normal boiling point of a liquid is the temperature at which its vapor pressure is 760mm Hg.






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






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






4. A law stating that at constant pressure - the volume of a given quantity of a gas varies directly with the temperature.






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






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






7. This process occurs when the system is thermally isolated so that no heat enters or leaves.






8. A law that states that under conditions of constant temperature and pressure - equal volumes of different gases contain equal numbers of molecules.






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. Rays made up of electrons in basic electron charges.






12. Increase in the concentrations of reactants shifts the equilibrium to the ______ - thus increasing the amount of products formed.

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13. The particular portion of the universe on which we wish to focus our attention. Everything else is called the surroundings.






14. Cells that convert electrical energy into chemical energy.






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






16. If this law was strictly obeyed - gases would not condense when they are cooled. This means that gases behave in an ideal fashion only at relatively high temperatures and low pressures.






17. Any spontaneous change in a chemical reaction will decrease the amount of free energy toward _______ as the process proceeds towards equilibrium.






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






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






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






21. The temperature at which a substance's solid and liquid phases are in equilibrium.






22. The process of mixing different orbitals of the same atom to form a new set of equivalent orbitals.






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






24. For a cell at concentrations and conditions other than standard - a potential can be calculated using this equation.






25. The vapor pressure increases with increasing _____.






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






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






28. **Five factors that affect reaction rates: 1. The nature of the reactants and products. 2. The surface area exposed. 3. The concentrations. 4. The temperature. 5. The catalyst.






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






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






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






32. The _____ speed up the rate of a chemical reaction but do not change the equilibrium constant - it simply speeds up the rate of approach to equilibrium.






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






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






35. The molecules in a gas collide with one another - but the collisions are perfectly elastic (they result in no net loss of energy).






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






37. Another way the second law is stated is that in any spontaneous change - the amount of free energy available ______.






38. The change in enthalpy of an endothermic reaction is ________.






39. 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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40. This law states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the gases in mixture.






41. *The Concentration usually _____ the chemical reaction rate with increasing concentrations of the reactants.






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






43. 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






44. When solids are heated at certain perssures - some solids vaporize directly without passing through the liquid phase.






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






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






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






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






50. The pressure exerted by the gas molecules when they are in equilibrium with the liquid.