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






2. Electronegativities _______ as you go down a group.






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. Liquids with strong attractive forces have ______ boiling points.






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






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






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






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






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






10. The vapor pressure of an aqueous solution is always lowered by the additon of more solute - which causes the boiling point to be raised.






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






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






13. The degree of randomness of a system is represented by a thermodynamic quantity called? the greater the randomness - the greater the _______.






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






15. 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.






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






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






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






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






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






21. 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.






22. 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.






23. 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.






24. 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






25. 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.






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






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






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






29. Because of the low intermolecular forces - the melting points are low and evaporation takes place so easily that it may occur at room temperature.






30. 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






31. Cells that convert electrical energy into chemical energy.






32. Real gases act in a less than ideal way - especially under conditions of increased pressure and/or decreased temperture. Real gas behavior approaches that of ideal gases as the gas pressure becomes very low. The ideal gas is thus considered a _____ _






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






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






35. *The electrons found in the outermost shell are called _____ electrons. When these electrons are lost or partially lost through sharing - the oxidation state is assigned a positive value for the element. If valence electrons are gained or partially g






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






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






38. 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.






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






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






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






42. 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.

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






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






45. 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.






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






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






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






49. 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.






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

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