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






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






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






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






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






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






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






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






9. *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.






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






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






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






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






14. The average kinetic energy of all the molecules collectively is directly proportional to the absolute temperature of the gas. The average kinetic energy of equal numbers of molecules of any gas is the same at the same temperature.






15. 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).






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






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






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






19. 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.






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






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






22. 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






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






24. Metals have electronegativities less than ____






25. The amount of heat energy required to raise the temperature 1g of a substance by 1 degree celcius.






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






27. 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.






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






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






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






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






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

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






36. 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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37. 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).






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






39. Rays made up of electrons in basic electron charges.






40. 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.






41. 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.






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






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






44. 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.






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






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






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






48. 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.






49. Cells that convert electrical energy into chemical energy.






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