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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. An increase in temperature causes the position of equilibrium of an exothermic reaction to be shifted to the _____ - while that of and endothermic reactions is shifted to the _______.

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






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






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






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






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






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






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






9. 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.






10. 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.






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






13. 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.






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






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






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






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

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






20. 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.






21. 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.






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






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






24. Metals have electronegativities less than ____






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






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






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






28. 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






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






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






31. 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.






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






33. 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).






34. 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.






35. Electronegativities _______ as you go down a group.






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






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






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






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






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






41. 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 _____ _






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






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






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






45. 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.






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






47. *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






48. The molecules in a gas are in constant - continueous - random - and straight-line motion.






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






50. The vapor pressure increases with increasing _____.