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






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






3. **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.






4. Liquids with strong attractive forces have ______ boiling points.






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






6. 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.






7. The temperature at which the pressure of vapor escaping from the liquid equals atmospheric pressure.






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






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






12. 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.


13. *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.






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






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






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






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






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






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






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






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






22. 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.






23. 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 _____ _






24. The process of determining the amount of a solution of known concentration that is required to react completely with a certain amount of a sample that is being analyzed.






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






26. 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.


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






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






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






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






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






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






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






34. 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.


35. 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.






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






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






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






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






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






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






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






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






44. 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.


45. 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.






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






47. The vapor pressure increases with increasing _____.






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






49. 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.






50. The solubility of gases in liquid or solid solvents always increases with ________ pressure.