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






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






3. 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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4. A chemical reaction formed from the union of its elements.






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






6. A chemical reaction formed from the breakdown of a compound into its individual elements or compounds.






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






8. The pressure of a gas is the result of collisions between the gas molecules and the walls of the container.






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






10. The general shape of any molecule can be predicted from the number of bonding and non-bonding electron pairs in the valence shell of the central atom. nonbonded pairs of electrons (lone pairs) are more repellent than bonded pairs.






11. A law that states that for a given mass of gas - the volume is proportional to the pressure and absolute temperature.






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






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






14. 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).






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






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






17. *Molecules of ideal gases have no attraction for one another and have no intrinsic volume - they are ______ _____






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






19. The heat change during a process carried out at a constant pressure.






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






21. *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.






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






23. The vapor pressure increases with increasing _____.






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






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






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






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






29. When the electron moves from the ground state to an excited state - it ______ energy.






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






31. The pressure exerted by each gas in a mixture is called its _____ pressure.






32. 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.






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






34. 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.






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






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






37. 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.






38. 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.






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






40. 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.






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






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






43. Metals have electronegativities less than ____






44. *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.






45. The process of determining the amount of a solution of known concentration that is required to react completely with a certain amount of a sample that is being analyzed.






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






47. 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.






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






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






50. 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.