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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. Cells that convert electrical energy into chemical energy.






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






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






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






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






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






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






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






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






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






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






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






14. 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.






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






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






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






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






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






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






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






22. 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.






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






24. 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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25. 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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26. The temperature at which a substance's solid and liquid phases are in equilibrium.






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






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






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






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






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






33. 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.






34. 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.






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






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






37. 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






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






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






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






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






42. 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.






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






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






45. 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.






46. *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.






47. State ________ depend only on the present state of the substance and not on the path by which the present state was attained. Enthalpy - energy - Gibbs free energy - and entropy are examples.






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






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