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






2. Cells that convert electrical energy into chemical energy.






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






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






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






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






7. 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).






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






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






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






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






12. *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.






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

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






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






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






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






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. 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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20. 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.






21. This is due to the way positive charges of one molecule attract the negative charges of another molecule. Compounds of the solid state that are bound mainly by this type of attractive have soft crystals - are easily deformed - and vaporize easily.






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






23. 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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24. A valence theory that permits the geometric arrangement of atoms - or groups of atoms - about some central atom to be determined solely by considering the repulsions between the electron pairs present in the valence shell of the central atom.






25. *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.






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






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






28. A pure crystal of elemental metal consists of roughly Avogrado's number of atoms held together by ________ bonds.






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






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






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






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






33. The vapor pressure increases with increasing _____.






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






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






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






37. Metals have electronegativities less than ____






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






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






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






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






42. 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.






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






44. 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.






45. The ________ of an element is a number that measerures the relative strength in which the atoms of the element attract valence electrons in a chemical bond - on a scale of 0-4.






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






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






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






49. 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






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