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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 formed from the breakdown of a compound into its individual elements or compounds.






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






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






4. 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.






5. 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.






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






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






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






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






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






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






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






13. 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.






14. *The nature of the reactants and products affect chemical reactions because some elements and compounds have bonds that when broken/formed - react more rapidly with each other than others.






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






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






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






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






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






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






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






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






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






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






26. 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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27. The freezing point is always lowered by addition of solute.






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






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






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






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






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






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






34. **Five factors that affect reaction rates: 1. The nature of the reactants and products. 2. The surface area exposed. 3. The concentrations. 4. The temperature. 5. The catalyst.






35. *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.






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






37. **Proceeding across a period from left to right - the ionization energy _______.






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






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






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






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






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






44. Electronegativities _______ as you go down a group.






45. Cells that convert electrical energy into chemical energy.






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






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






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






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






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