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






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






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






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






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






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






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






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






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






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






11. 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.






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






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






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






16. Metals have electronegativities less than ____






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






18. The ______ of the system is some particular set of conditions of pressure - temperature - number of moles of each component - and their physical form (ex: gas - liquid - solid or crystalline form).






19. 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).






20. 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.






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






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






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






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






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






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






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






28. 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.






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






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






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






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. **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.






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






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






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






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






39. 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






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






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






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






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






45. 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.






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






47. 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.






48. 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.






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






50. *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.