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






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






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






4. 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.






5. Decreasing the concentrations of reactants shifts the equilibrium to the ______ - thus decreasing the concentration of products formed.

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






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






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






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






10. When a system at equilibrium is disturbed by adding or removing one of hte substances - all the concentrations will change until a new equilibrium point is reached with the same value of Keq.

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11. _______ has very little effect on the solubility of liquids or solids in liquid solvents.






12. When a hydrogen atom is bonded to a highly electronegative atom - it will become partially _____-charged - and will be attracted to neighboring electron pairs. This creates a hydrogen bond. The more polar the molecule - the more effective the hydroge






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






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






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






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






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






19. Metals have electronegativities less than ____






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






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






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






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






24. Cells that convert electrical energy into chemical energy.






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






26. 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.






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






28. 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






29. 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).






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






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






32. *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.






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






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






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






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






37. A hypothetical gas would follow Boyles law under all conditions and is called?






38. A chemical reaction where there is an actual exchange of partners to form new compounds. ex: AgNO3 + NaCl -> AgCl + NaNO3.






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






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






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






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






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






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






46. 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.






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






48. 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.






49. Because of the low intermolecular forces - the melting points are low and evaporation takes place so easily that it may occur at room temperature.






50. The vapor pressure increases with increasing _____.






Can you answer 50 questions in 15 minutes?



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