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






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


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






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






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






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






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






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






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






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






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






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






13. The temperature at which the pressure of vapor escaping from the liquid equals atmospheric pressure.






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






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






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






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






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






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


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






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






22. *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.






23. 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






24. 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.






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






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






27. The vapor pressure increases with increasing _____.






28. 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.






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






30. A principle stating that when a system at equilibrium is disturbed by the application of a stress (change in temperature - pressure - or concentration) it reacts to minimize the stress and attain a new equilibrium position.


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






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






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






34. 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






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






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






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






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






39. 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.


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






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






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






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






44. 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.






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






46. 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.


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






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






49. 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.






50. 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.